鶴岡発條 List of Products and Services

The material used is "spring stainless steel wire - SUS304-WPB." The wire diameter is Φ0.45. This product is shaped using a multi-forming machine. After shaping, heat treatment (low-temperature annealing) is applied to remove processing strain. At the time of delivery, to prevent tangling between products, each item is packed on a pallet and shipped. If you have any issues with springs or forming, it's okay even if you don't have drawings. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

The material used is "Piano Wire Type A, SWP-A," with a wire diameter of Φ2.3. It has been treated with trivalent chromate plating for rust prevention. The ends of the compression spring are referred to as "closed ends." The typical shape of a closed end is where the end touches the adjacent coil. As a spring manufacturer, we will produce it with a "closed end" unless otherwise specified regarding the end shape. The closed end of this spring has a "pig tail end" on the front side, where the end wraps inward toward the inner diameter, and an "open end" on the back side, where the end is separated from the adjacent coil. Regarding the end shape of the compression spring, we can manufacture it according to the customer's requests. Please feel free to consult us if you have any concerns. Sakurako Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Spring

The tension spring in the photo was designed and prototyped by our company at the request of the customer. The design conditions were the coil outer diameter (+0) and the load from installation to maximum. Additionally, we have ensured that the specification meets the durability requirement of over 1 million cycles. When calculating the lifespan of the tension spring, we evaluate not only the body but also the strength of the hooks at both ends. We chose a "round hook" shape, which is resistant to breakage and deformation. Our company accepts design and prototyping of tension springs. If you provide us with the general specifications (design conditions), we will propose and produce the optimal specifications and prototypes. Please feel free to leave the lifespan calculations to us. If you have any concerns, please do not hesitate to consult us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Contract manufacturing

The material used is "Piano Wire Type A, SWP-A," with a wire diameter of Φ0.4. The hooks at both ends are shaped as "round hooks," which are less likely to cause issues such as breakage or deformation. The hooks are slightly smaller compared to the body, but they can be formed to be smaller or larger. There is a gap in the body, which is to ensure that the initial tension (*) is zero. *Please refer to the related link for information on initial tension. Due to the manufacturing process, some variation in initial tension is unavoidable, and a tolerance of ±15% is established under JIS standards. The variation in initial tension can affect the load, but by leaving a gap in the body, this influence can be eliminated. Our company handles the manufacturing, design, and prototyping of tension springs. Please feel free to consult us if you have any concerns. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Contract manufacturing

The material used is "nickel-plated steel wire - SWIC-F." "SWIC" is a plated steel wire that has undergone surface treatment on iron-based spring materials. Although it is not compliant with JIS standards, the base materials, such as piano wire and hard steel wire, conform to JIS standards. Due to its high electrical conductivity and good solderability, it is often used as a material for battery springs and antennas. This wire antenna is shaped using a multi-forming machine. The heat treatment after shaping is conducted at a low temperature of 200 to 250 degrees to maintain solderability. If you have any issues with springs or wire forming, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Also available for web conferencing.

• Contract manufacturing

The material used is "hard steel wire - SW-B." While "hard steel wire" is less durable compared to the iron-based spring material "piano wire," it is a cost-effective and easily workable material. This product is shaped using a multi-forming machine. After shaping, it undergoes heat treatment and surface treatment to improve rust resistance and solderability. The surface treatment is "solder-compatible nickel plating." If you have any issues with springs or wire forming, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Also available for web meetings.

• Contract manufacturing

The material used is "nickel-plated steel wire SWIC-F." It is a plated steel wire that has been pre-plated with a steel-based spring material. Although "SWIC-F" itself is a material not conforming to JIS standards, the base spring material used is compliant with JIS standards, specifically "hard steel wire SW-B, SW-C" and "piano wire SWP-A, SWP-B." "SWIC" has the characteristics of high electrical conductivity, rust resistance (comparable to SUS spring materials), and good solderability. Due to these properties, it is widely used as a material for battery terminals and battery springs. This battery spring is processed using a multi-forming machine and handmade techniques. The heat treatment after forming is conducted at a low temperature of 200 to 250 degrees to maintain solderability. If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruoka Spring Co., Ltd. We also support web conferencing.

• Contract manufacturing

The material used is "Nickel-plated steel wire SWIC-F." Although it is not a JIS standard material, it has a wide variety of wire diameters and is readily available. "SWIC-F" is a plated steel wire that has been nickel-plated on iron-based spring material. Due to its high electrical conductivity and good solderability, it is commonly used for springs around electronic components. Additionally, despite being a plated wire, it has the advantage of not being susceptible to hydrogen embrittlement. The corrosion resistance of "SWIC" is comparable to that of SUS spring materials. Therefore, post-plating is unnecessary, which can lead to cost reduction. For the base spring materials, there are "hard steel wire," which has good workability, and "piano wire," which is excellent in durability, allowing for selection based on the application of the spring. If you have any concerns regarding springs or forming, please feel free to consult us. Our technical staff will respond carefully. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruoka Spring Co., Ltd. We also support web meetings.

• Contract manufacturing

The material used is "Nickel-plated steel wire SWIC-F." "SWIC-F" is a plated steel wire that has been nickel-plated on iron-based spring material. The base spring material can be chosen between "hard steel wire," which has good workability, and "piano wire," which excels in durability, depending on the application of the spring. "SWIC-F" is a material with high electrical conductivity and excellent solderability, commonly used for battery terminals and battery springs. Its corrosion resistance is comparable to that of SUS spring materials, allowing for the elimination of post-plating, which can also lead to cost reduction. Additionally, there is the advantage that hydrogen is removed during the wire drawing process, eliminating the risk of hydrogen embrittlement. This battery spring is formed using a multi-forming machine. After spring formation, heat treatment is performed at a low temperature of 200 to 250 degrees to ensure solderability. Upon delivery, the products are separated into individual pallets to prevent entanglement.

• Contract manufacturing

The shape of this spring's hook is a "U hook." It is a commonly used shape alongside "reverse round hooks" and "round hooks." Although it is a shape that can be formed using a multi-forming machine, the hook part is processed by hand due to small lot production. In the case of small lot production, incorporating handmade elements can help reduce costs, not just for this spring. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

The material used is "Silicon Chrome Steel Oil Tempered Wire for Valve Springs (SWOSC-V)." The wire thickness is Φ4.2. There are two types of oil-tempered wire for iron-based spring materials: "spring use" and "valve spring use." While the base material for "spring use" is hard steel wire, "valve spring use" employs piano wire as the base material, with strict quality standards established due to impurities in the steel and surface conditions. Thus, "valve spring use" is considered a higher-grade material. "SWOSC-V" is the most durable material among spring materials conforming to JIS standards. It is chosen when the durability of the iron-based spring material "piano wire" does not meet requirements. However, it is a material that is easily affected by hydrogen embrittlement, so plating treatment is not allowed. Therefore, the valve spring in the photo has been treated with electrodeposition coating as a rust prevention measure. If you have any concerns regarding springs, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. for springs Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

Initial tension refers to the force with which adjacent lines stick to each other. Imagine an experiment where you hold a hook of a tension spring (about the size of a thumb) and pull it to the left and right. You gradually apply force while pulling until a gap begins to form in the closely adhered body. If a gap forms immediately, it means the "sticking force" is weak, indicating weak initial tension. Conversely, if a gap takes a long time to form, the "sticking force" is strong, indicating strong initial tension. In this experiment, if you attach a "spring scale" to one of the hooks, you can easily measure the initial tension. The force exerted on the spring scale when a gap begins to form in the body equals the initial tension. The strength of the initial tension can be adjusted by us, the manufacturers. By changing the settings of the spring processing machine, we can wind the spring with the desired initial tension. However, the problem is that initial tension has a "suitable strength for processing." If it is too weak, the processing becomes unstable, and if it is too strong, the processing itself becomes difficult. The extent to which it can be processed strongly (or weakly) varies depending on the material, shape, and processing equipment, so I believe it is best to contact us, the manufacturers, for a shortcut.

• Contract manufacturing

The double torsion spring has a shape formed by connecting two torsion coil springs. It is also called a double kick spring. Typically, the left and right coils have the same specifications, but if they differ, moments and lifespans are calculated separately. The calculation uses the formulas for torsion coil springs. The material of this spring is a steel-based spring material "Piano Wire Type A, SWP-A." After forming, it undergoes heat treatment (low-temperature annealing) and is coated with anti-rust oil. If you have any issues with springs, please feel free to consult us. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Spring

The clues for identifying the cause of breakage are lifespan calculations and strength calculations. If a spring breaks below the calculated results, the cause of the breakage is suspected to be "stress concentration" originating from scratches or machining marks. When we examine the springs upon consultation, we often find scratches or machining marks caused during processing. In this case, reworking with attention to these scratches can lead to improvement. If the timing of the breakage aligns with the calculations, the cause of the breakage is thought to be insufficient material strength. The countermeasure for breakage in this case is to change the specifications of the spring. Specifically, this may involve changing the material to one that is more durable or increasing the wire diameter, while considering the balance to avoid altering the spring's force characteristics (spring constant, load). Our company addresses spring-related issues such as breakage and sagging. If you send us broken samples, we will propose countermeasures and, if desired, we can also produce improved prototypes. First-time customers are also welcome to consult with us without hesitation. In fact, most of the customers who consult with us have never done business with us before. We look forward to your inquiries.

• Contract manufacturing

The twisted spring in the photo was designed and prototyped by our company. We proceeded with the design based on the following specifications you provided: 1) Coil inner diameter, 2) Load at installation to maximum angle, 3) Durability (1 million cycles) The designed spring can be prototyped in a short lead time. The spring in the photo was delivered about one week after the order was placed. We can manufacture from a quantity of one. Our company accepts the manufacturing, design, and prototyping of various springs. If you provide us with rough design conditions, we will propose the optimal specifications and produce a prototype. We understand that some may be unsure about how to specify the design conditions for the spring. Our technical staff will respond carefully, so please feel free to consult with us. Tsuruga Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Spring

When calculating the load of a tension spring, we consider an unfamiliar force called initial tension. Initial tension is the force that causes the coils to want to adhere to each other, and it can be determined from the wire diameter, the average coil diameter, and "initial stress." However, in the literature, it is stated that there is a certain range for the value of "initial stress," and it is troublesome as it suggests selecting an appropriate value from that range. In fact, initial tension can be adjusted by us manufacturers by winding it tightly or loosely. (We adjust the strength by changing the settings of the spring processing machine.) To put it somewhat roughly, the "range of adjustment" on the manufacturer's side is quantified as the "range of initial stress." Even if the springs appear to have the same specifications, if the manufacturer applies a strong "initial stress," it will result in a spring with strong initial tension. Initial tension and initial stress are concepts that are difficult to understand just by reading books. (For more information on initial tension, please refer to the related links.) If you have any questions, please feel free to contact us by phone or email. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

"Settle" refers to the phenomenon where the material of a spring undergoes plastic deformation during use, resulting in a change in the dimensions of the spring, primarily caused by insufficient material strength. The adequacy of the material's strength can be calculated based on the spring's usage conditions. Countermeasures for "settle" involve changing the material to one with higher durability, increasing the wire diameter, and other specification modifications. In doing so, care is taken to select specifications that do not alter the spring's force characteristics (spring constant or load), but if there are space constraints for the spring, discussions with the customer will be necessary. If there are no issues with the strength calculations, potential causes of "settle" may include: 1) improper heat treatment after spring formation, or 2) use in an environment exceeding the heat resistance temperature. Our company addresses spring-related troubles. If you send us the deformed item, we will verify its strength and durability and propose improvement measures. Our technical staff will respond carefully, so please feel free to consult us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 Email: web@tohj.com We also support web meetings.

• Spring

We have received inquiries about the issue of 'the spring's force weakening during use.' This is caused by 'sagging.' 'Sagging' is a phenomenon where the material undergoes plastic deformation during the use of the spring, resulting in a change in the dimensions of the spring, which is due to insufficient material strength. Whether the material's strength is adequate can be calculated based on the spring's usage conditions. Countermeasures for 'sagging' involve changing the material to one with higher durability, increasing the wire diameter, and other specification changes. In doing so, we select specifications to ensure that the spring's force (spring constant and load) does not change; however, if there are restrictions on the space where the spring fits, we will proceed in consultation with the customer. If there are no issues with the material strength calculations, potential causes of 'sagging' may include: 1) improper heat treatment after spring forming, or 2) use in environments exceeding the heat resistance temperature. Our company addresses issues related to sagging, deformation, and other spring troubles. If you send us samples, we will verify the strength and durability and propose improvement measures. Our technical staff will respond carefully, so please feel free to consult with us.

• Spring

The clues to identify the cause of breakage are lifespan calculations and strength calculations. If the breakage occurs significantly below the calculation results, the cause of the breakage is suspected to be "stress concentration" originating from scratches or bent areas. Measures against stress concentration include changing the shape of the spring. Effective measures include selecting "round hooks (photo)" or "tapered round hooks" for tension springs, and specifying that the bend radius of the arms of torsion springs should be greater than the wire diameter radius. If the timing of the breakage aligns with the calculations, the cause of the breakage is considered to be insufficient material strength. In this case, the countermeasure for breakage is to change the specifications of the spring. Specifically, this involves changing the material to a more durable one or increasing the wire diameter, but it is necessary to consider the balance to avoid changing the spring's force adjustment (spring constant, load). Our company responds to spring troubles. If you send us the broken parts, we will propose improvement measures. Please feel free to consult us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Contract manufacturing

This is a torsion coil spring designed and prototyped by our company in response to the customer's request. The purpose is to assist the opening and closing of a certain product's door using the spring's force. To quantify the appropriate force for opening and closing it "just right," we visited the site several times. Given the need for corrosion resistance and a certain level of heat resistance, we chose the material as "spring stainless steel wire SUS304-WPB." The designed spring can be realized in a short delivery time. (This product was also delivered in about a week.) The ability to provide prototypes with a short lead time is one of the advantages we offer. Our company handles the design and prototyping of torsion springs. If you provide us with the general conditions, we will propose the optimal specifications. It is also fine if you do not have any drawings. Our technical staff will respond carefully, so please feel free to consult with us. Tsurugaoka Spring Co., Ltd. for springs and springs Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

The spring in the photo is a torsion spring designed and prototyped by our company. We received the actual spring because it was reported to be deformed during use. After discussing the situation and calculating its lifespan, we found that its strength was insufficient for the stress (load) during use, so we proceeded with redesigning and prototyping. The material used is "Piano Wire Type A, SWP-A." We selected specifications to improve durability without changing the force (moment) when twisted. (Surface treatment has been applied for storage as a sample.) Our company handles the design and prototyping of torsion springs. If you provide us with general conditions such as the space for the spring and the desired force, we will propose the optimal specifications and create a prototype. Our technical staff will respond carefully, so please feel free to consult us. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Contract manufacturing

The hook shape in the photo is called a "shutter round hook." The hook is formed with a wire diameter thicker than the body, and it is incorporated into the body with a stop-off process. This hook shape is particularly strong against breakage and deformation. This spring is a breakage countermeasure product designed and prototyped by our company at the request of a customer. We received a consultation regarding "springs breaking in production equipment and lines" and redesigned it with improved specifications. We have enhanced durability without changing the force applied (load) when pulled. Our company addresses spring troubles such as breakage and sagging. If you send us broken samples, we will propose countermeasures and, if desired, we can also produce improved prototypes. Our technical staff will respond carefully, so please feel free to consult with us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

The material used is "Piano Wire Type A, SWP-A," with a wire diameter of Φ2.3. The shape of the hooks at both ends is "semi-round hooks." The hooks are formed using a multi-forming machine, which includes the hook processing. Since tension springs have the characteristic of concentrating stress (load) at the hook part, the processing tools are smoothly wrapped to prevent scratches and marks. After spring forming, heat treatment (low-temperature annealing) is applied to remove processing strain. The surface treatment is "trivalent chromate + baking." Springs of the same shape have also been successfully made from spring stainless steel wire, SUS304-WPB, SUS316-WPA, and Herculite. Our company handles the manufacturing, design, and prototyping of tension springs. Please feel free to consult us if you have any concerns. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. for springs and springs We also support web meetings.

• Spring

The material used is "hard steel wire - SW-C." While "hard steel wire" has lower durability compared to the iron-based spring material "piano wire," it is a cost-effective material with good workability. After forming, heat treatment is performed, and barrel polishing is carried out to remove fine burrs and other imperfections. The surface treatment is "electroless nickel plating." If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Contract manufacturing

This is a spring used for controlling the movable iron piece of an electromagnetic valve. To accurately manage the installation to maximum load, a sensor called a length measuring device is used. The length measuring device automatically measures and adjusts the free length of the spring during the coiling process. Since the variation in the spring's load is almost proportional to the variation in free length, control using this length measuring device is effective. The material used is "phosphor bronze wire, C5191W." After spring forming, the spring's properties are enhanced through heat treatment. Similar springs have been successfully made from "piano wire, SWP-A, SWP-B" and "stainless steel wire for springs, SUS304-WPB, SUS316-WPA." If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Technical contact: Ujiie Phone: 0235-22-0407 Tsuruoka Spring Co., Ltd. Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

The material used is "spring stainless steel wire SUS304-WPB." The wire with a diameter of Φ0.35 is wound into a coil with an average diameter of Φ11mm. The spring index is approximately 31, indicating that it is a spring with a high difficulty level for coiling processing. The spring index is the value obtained by dividing the average coil diameter by the wire diameter, serving as a guideline for the difficulty of processing the spring. It is also referred to as the spring index = D/d (Devi-D). According to JIS standards, a spring index between 4 and 22 is desirable. If the spring index is 4 or lower, the coil diameter is small and tight, making it difficult to wind; if the spring index exceeds 22, the coil diameter is large and fluffy, making it difficult to wind, which gives you that impression. This spring has a spring index exceeding 22, at 31, but how does it look? It seems to be wound quite neatly. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. for springs. We also support web conferences.

• Spring

We use a copper alloy with good electrical conductivity, "Phosphor Bronze Wire C5191W." Phosphor bronze wire is a softer and more workable material compared to other spring materials like piano wire. By applying heat treatment after processing, its hardness increases and it gains "springiness." After heat treatment, the wire is cleaned with ultrasonic cleaning to remove surface dirt before shipment. If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Technical Contact: Ujiie We also support web conferencing. Tsuruoka Spring Co., Ltd.

• Contract manufacturing

The material used is "spring stainless steel sheet SUS631-CSP." It is a material that excels in strength and heat resistance compared to the general-purpose SUS spring material "SUS304-CSP." After spring forming, a heat treatment at 475 degrees for 60 minutes is applied to ensure the specified strength. This heat treatment is called precipitation hardening or aging treatment, and it is a process similar to quenching. Our specialties are round wire springs and forming, but we also manufacture and source flat springs. The materials we have a proven track record with are as follows: ■ Quenched ribbon steel (SK85-CSP-H) ■ Bainite steel sheet (C60C-CSP-B) ■ Stainless steel strip for springs (SUS304-CSP, SUS631-CSP, SUS301-CSP) ■ Phosphor bronze sheet (C5191P), spring phosphor bronze sheet (C5210P) ■ Beryllium copper sheet for springs (C1720P) If you have any issues with springs, please feel free to consult us. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. for springs. We also support web meetings.

• Contract manufacturing

The material used is "Piano Wire Type A, SWP-A," with a wire diameter of Φ1.2. It has a shape similar to a compression spring, but it is a torsion spring that is used by hooking the inner protrusions and twisting in the direction of winding the spring. The springs are formed using a multi-forming machine, and the allowable tolerance for the coil outer diameter of Φ16mm is managed with a precision of "±0.1mm," which is above JIS standard grade 1. (The allowable tolerance for JIS standard grade 1 is ±0.2mm.) The surface treatment is "trivalent chromate plating." If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

The material used is "tin bronze wire - C5191W." Tin bronze wire is a material that has good workability and excellent corrosion resistance. It is also well-suited for plating and soldering, making it commonly used as a material for accessories. We have experience with similar shapes in "gold wire," "silver wire," and "platinum wire." There is also a process for stamping fine engravings such as "K18" and "K24" on the side of "gold wire," which is handled by fully automatic NC machines. Our company specializes in wire forming processing for accessories and more. If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferences.

• Contract manufacturing

The material used is "spring stainless steel wire SUS304-WPB." It is shaped using a multi-forming machine. Since the spring material is hard, it is sensitive to scratches. Therefore, we take great care to wrap the processing tools to prevent scratches from the tools on the bending parts. Additionally, we perform a double-check using a magnifying glass to prevent the occurrence and leakage of scratches. Our company specializes in wire forming processing. Please feel free to contact us if you have any concerns. Tsuruga Spring Co., Ltd. for springs Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

The material used is "Piano Wire Type A, SWP-A." This spring is processed by a multi-forming machine, involving winding and bending. Since the flatness of the product is important (to avoid rattling when placed on a flat surface), we use dedicated jigs for inspection and management. After forming the spring, heat treatment (bluing) is performed, and blackening treatment is applied for rust prevention. We also have experience with similar springs made from "stainless steel wire for springs" and "bronze wire." If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Contract manufacturing

The material is "18K gold." Our company is also skilled in wire forming for accessories and other items. It may be a bit hard to see, but we have stamped "K18" in the arrowed area. The stamping, along with the multi-forming, is done consistently using a multi-forming machine. We have experience processing with silver wire, platinum wire, and other similar shapes. While we receive gold wire, silver wire, and other materials from clients, we take care to weigh them upon arrival and shipment to ensure there are no shortages, as these materials are expensive. If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Contract manufacturing

The material used is "Beryllium Copper Wire - C1720W." Beryllium copper is the material with the best spring characteristics among copper alloys. It also has good corrosion resistance and electrical conductivity, making it suitable for electronic components such as relays and connectors. Incidentally, it is known as a material for safety tools used in oil refineries and mines due to its property of not producing sparks upon impact. In its "raw" state before heat treatment, it has good workability for bending and other processes, and after heat treatment, it possesses strength comparable to steel. The heat treatment is a type of quenching known as precipitation hardening (also referred to as aging treatment), which differs from other spring materials. This product also undergoes heat treatment after spring forming to achieve the specified strength. The heat treatment temperature is 315 degrees, requiring temperature control within ±5 degrees, so a temperature-controlled batch furnace is used. If you have any concerns regarding springs, please feel free to consult us. Technical Contact: Ujiie Phone: 0235-22-0407 Tsuruoka Spring Co., Ltd. Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

The material used is "copper-tin bronze wire C5191W." It is an excellent material for electrical conductivity and corrosion resistance, and it gains "springiness" through heat treatment. This spring is used in the brush part of motors. For brush springs of the same shape, there have been successful applications using "spring stainless steel wire" and "piano wire." While managing the flatness when placed on a reference plate and the dimensions of the opening of both legs, we perform multi-forming processing. The surface treatment also includes "silver plating," which has good electrical conductivity. If you have any issues with springs or forming, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Contract manufacturing

This is a spring for a check valve (non-return valve). The material used is "silicon-chromium steel oil-tempered wire for valve springs (SWOSC-V)." It is a ferrous material that excels in durability and heat resistance compared to "piano wire." After spring forming, "shot peening" and "setting" treatments are applied to enhance the durability of the spring. The surface treatment is "molybdenum disulfide and parylene treatment." Our company handles the manufacturing, design, and prototyping of springs. Please feel free to consult us if you have any concerns. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd., based in Tsuruoka, specializes in springs. We also accommodate web meetings.

• Spring

The material used is "Piano Wire Type A - SWP-A." We process materials sized "5mm x 2mm" with vertical winding, ensuring that the materials do not lie flat or fall over by using various jigs. After spring formation, we perform a setting treatment to prevent sagging during use. The material for the square springs is generally made to order, but we have a certain amount of stock available. If we have materials with similar dimensions, we can also produce prototypes in a short lead time. Our company handles the manufacturing, design, and prototyping of square springs. Please feel free to consult us if you have any concerns. Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd., specializing in springs and springs We also accommodate web meetings.

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The material used is "Copper-Beryllium Wire C5191W." One side of the spring's seat coil is processed into a tapered shape. After forming, heat treatment is applied to enhance spring properties, and surface treatment includes "nickel undercoating and gold plating." The installation load, maximum load, and spring constant are managed using a spring load testing machine. The spring load testing machine undergoes annual calibration by the manufacturer and internal inspections every three months to maintain and manage measurement accuracy. Delivery will include a mill sheet and inspection report. The inspection report will contain data on key dimensions and spring characteristics. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

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When the wire diameter of a compression spring is thick, the ends of the spring are ground flat. Grinding is also referred to as polishing. The purpose of grinding is to improve the seating of the spring. Now, regarding the wire diameter at which grinding is performed, it is not actually specified in the JIS standards. Many spring-related publications suggest that grinding is done for wire diameters of 0.5mm or more. If grinding is not performed, the price of the spring will be lower. Therefore, if there are no issues with usage, I recommend considering "no grinding" even for wire diameters of 0.5mm or more. As a guideline, if the wire diameter is 2.0mm or less and the spring index (the value obtained by dividing the average coil diameter by the wire diameter) is 13 or more, it is considered that the spring can be used without grinding and still have good seating. For this spring, the wire diameter is 2.0mm, the average coil diameter is 28mm, and the spring index is 14. How does that look? The spring on the left in the photo has good seating visually, and the perpendicularity meets JIS Class 2 (approximately 2.9 degrees) and is kept below 2 degrees. If you have any questions about "grinding" for compression springs, please feel free to consult us. We can also accommodate prototype assessments with a short lead time.

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The material used is a high electrical conductivity copper alloy wire "Phosphor Bronze Wire - C5191W." After multi-forming processing with NC machines, heat treatment (low-temperature annealing) is applied to enhance spring properties, and to prevent the springs from tangling, they are packaged in bags of 100 pieces each for delivery. Our company handles the manufacturing, design, and prototyping of return springs. Please feel free to consult us if you have any issues. Our technical staff will respond carefully. If you have any problems with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

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The material used is "Piano Wire Type A, SWP-A." The wire thickness is Φ5.0. After forming the spring with a heart gold type winding machine, it undergoes heat treatment (low-temperature annealing) and shot peening. Shot peening is a process that projects countless small steel balls onto the surface of the spring. This treatment improves durability by modifying the surface of the material. Using a spring load testing machine, we output data on the mounting load, maximum load, and spring constant, and we will provide an inspection report upon delivery. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

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The material used is "spring stainless steel wire - SUS304-WPB." Although the shape can also be processed with a multi-forming machine, this spring was ordered in a quantity of one, so it is being handmade. For small lot orders, we can keep costs down by processing them by hand. Not only do we handle large lot mass production, but our ability to accommodate small quantities with handmade processing is also one of our strengths. We have received positive feedback from customers regarding our quick turnaround for prototype production. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

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The material used is "oil-tempered wire made of silicone chrome steel for springs, SWOSC-V." "SWOSC-V" is the most durable material among general-purpose spring materials. Oil-tempered wires, including SWOSC-V, are also referred to as quenching wires. Unlike other spring materials such as piano wire, their strength comes from quenching and tempering, which is the origin of the name. Materials that have been quenched and tempered are not only hard but also possess a moderate level of "toughness," and are sometimes described as "ductile materials." Oil-tempered wires, including SWOSC-V, are susceptible to hydrogen embrittlement, so plating treatment is not allowed. Therefore, this spring has been treated with "Geomet treatment," which poses no risk of hydrogen embrittlement as a rust prevention measure. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

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The material is "Piano Wire Type A, SWP-A," with a wire diameter of Φ3.0. Both arms of this torsion spring are designed as hooks for assembling the wire. We received a request from the customer that "the hooks should be flat when viewed from the side." After the forming process, we add a pressing step to correct the hooks to be flat. A phosphate coating treatment has been applied for rust prevention. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

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The material is "spring stainless steel wire - SUS304-WPB," and the wire thickness is Φ0.9. It is used as a clip to fix the workpiece by utilizing its spring properties. The entire bending process is performed using a multi-forming machine. After forming the clip, heat treatment is applied to remove residual stress and stabilize the shape. A test report with a material certificate (mill sheet) will be attached upon delivery. Our company specializes in spring and wire forming processing. Please feel free to consult us if you have any concerns. Tsurugaoka Spring Co., Ltd. for springs and springs Technical contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

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