鶴岡発條 List of Products and Services

I will count the number of coils in the photo of the compression spring. The number of lines = the number of circles = 5, therefore the number of coils = 5, but it is important to note that this is not the case. In the case of springs, one complete turn is counted as one coil. If you start counting from the left end, it will be one coil at the red circle. The star-marked area is still less than one coil, approximately 0.5 coils. The number of coils in this spring = 4 coils. By the way, the one coil at both ends is in contact with the adjacent coil and is called a "seat coil." The role of the seat coil is to improve stability when standing, and the seat coil itself does not function as a spring. The number of coils excluding the seat coils, which effectively work as a spring, is called the effective number of coils. This spring has an effective number of coils = 2 coils, total number of coils = 4 coils. If you have any questions or concerns about 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 Tsuruoka Spring Co., Ltd. We also support web conferences.

• Spring

The representative hook shapes of tension springs are the reverse round hook and the round hook. The reverse round hook is in the foreground of the photo, while the round hook is in the background. The reverse round hook is designed to be pinched at the center before being raised (indicated by the arrow), which means the spring is pulled from the center of the coil, resulting in excellent load stability. However, a disadvantage is that stress (load) concentrates at the pinched part. The round hook, on the other hand, is raised without being pinched, which helps reduce stress concentration. Additionally, based on experience, its load stability is comparable to that of the reverse round hook. (For more information about the round hook, please refer to the related links.) There are various other hook shapes as well, including U hooks, half-round hooks, and side round hooks. If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. 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

The hooks of tension springs are typically formed by raising one coil at each end of the spring. When a load is applied to the tension spring, stress (load) tends to concentrate at the base and inside of this hook, so issues such as breakage or deformation mostly occur starting from the hook. The spring equipped with a plate hook, as shown in the photo, covers this "weakness" of tension springs. Although it incurs additional costs for manufacturing the separate plate, it can reduce stress concentration on the hook, making it a hook shape that is resistant to breakage and deformation. This hook shape is referred to as a "screw-in hook" in JIS standards. Additionally, the "tapered round hook," which incorporates a round wire hook inside the spring, is also a hook shape that is strong against breakage and deformation. (For more information about the tapered round hook, please refer to the related links below.) If you are experiencing issues with spring troubles such as breakage or deformation, please feel free to consult us. If you send us broken samples, we will propose improvement measures. Tsuruga Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

We are processing 3mm x 3mm square bars into coils. The material is "stainless steel wire, SUS304." The inner diameter side is fixed to a shaft and is used as a conveyor for transporting powders and viscous materials. To maintain a consistent winding pitch, we use a CNC-controlled winding machine. Our company applies wire winding and bending technologies to manufacture various components, not limited to springs. Our technical staff will respond carefully, so please feel free to consult with us. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Spring

The typical type is a closed end, where the tip of the coil at the end is in contact with the next coil. This single turn at the end is called a "seat coil" (zamaki). The seat coil serves to improve the stability of the spring when it is upright, but it does not have any functional role as a spring. The turns that function as a spring are those excluding the seat coil, and the number of turns that effectively function as a spring is referred to as the effective number of turns. The spring in the photo is an atypical "open end." The tip of the coil at the end is not in contact with the next coil, creating a gap (indicated by the arrow). The seat coils at both ends are less than one turn, resulting in fewer seat coils compared to a closed end. The reason for deliberately adopting a non-typical open end is mainly in the following cases: 1) When you do not want to change the spring constant (want to keep the effective number of turns fixed), and 2) When you want to keep the height at which the spring is in contact low (want to reduce the total number of turns). While reducing the seat coils may worsen the stability of the spring, it allows you to maintain the spring constant while keeping the contact height low.

• Spring

Material: GCN49W (Copper-nickel wire for general electrical resistance) Wire diameter: Φ1.0 Winding and bending processes are performed using automatic machinery. We have a track record with similar products starting from a wire diameter of Φ0.3mm. We are a manufacturer of springs, but we also accept processing other than springs by utilizing our winding and bending technology. Please feel free to contact us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

• Spring

To obtain a nonlinear spring constant, a coil spring with an uneven pitch, like the one in the photo, is effective. When deflection is applied to this spring, the narrower pitch section on the right side first makes contact. As a result, the apparent effective number of coils in the entire spring decreases, increasing the spring constant and significantly raising the load. The spring constant takes on a shape similar to a broken line graph. Springs with a nonlinear spring constant include not only uneven pitch springs but also conical springs. The spring constant of these springs gradually increases with increasing deflection, resulting in a curved shape. 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 Tsuruoka Spring Co., Ltd. We also support web conferencing.

• Spring

【Tension Spring Deformation Prevention Stopper】 Material: Piano Wire Type A / SWP-A Wire Diameter: Φ1.2 A deformation prevention stopper is attached to the body of the tension spring. It is designed so that the stroke does not exceed the stopper. The stopper is made by bending a Φ1.0 wire, and the material is hard steel wire (SW-C). Our company handles the manufacturing, design, and prototyping of tension springs. Our technical staff will respond carefully, so please feel free to consult us if you have any concerns. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Stainless steel wire for springs, SUS316-WPA Wire diameter: Φ4.0 After spring processing, the surface is polished to a shiny finish using barrel polishing. By finely adjusting the material, size, and polishing time of the media, a gloss like the one in the photo is achieved. We will display the actual product at the exhibition, and everyone is surprised by the level of gloss achieved just through barrel polishing. We are grateful for the trial and error on site. If you have any issues with springs, please feel free to consult us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

The hook that looks like a photo is called a "drawn round hook." It has a hook integrated into the body, making it resistant to issues such as breakage and deformation. The hook and body are manufactured separately, and typically, a thicker wire diameter for the hook is chosen compared to the body. While increasing the strength of the hook, the spring constant of the body can be freely designed, which is an advantage of the "drawn round hook." (Please also see the related links.) Our company handles the design and prototyping of tension springs. Our technical staff will respond carefully, so please feel free to consult us if you have any concerns. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type A, SWP-A Wire diameter: Φ1.8 Prototype quantity = 5 pieces, delivered within 5 days after your request. Our company specializes in the manufacturing and design of twisted coil springs, including prototypes. Please feel free to contact 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.

• Spring

Material: Piano wire type A, SWP-A Wire diameter: Φ3.5, right hook only Φ5.0 Both hooks are shapes not specified by JIS standards. The left hook is shaped like a reverse round hook, which is pinched inward before the U-hook is raised. The right hook is a longer version of the pinched round hook. A thicker hook than the body is processed to prevent it from slipping out and is incorporated inside the body. (For information on the pinched round hook, please refer to the related links.) 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. Contact: Ujiie Phone: 0235-22-0407 Fax: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type A, SWP-A Wire diameter: Φ1.5 The terminal on the right side of the spring is a tightly wound 5-turn coil. The inner diameter is managed to allow for smooth screwing of an M10 bolt. The method of screwing a bolt into a tightly wound coil is sometimes used for fixing springs. By changing the wire diameter and coil inner diameter, the feel when screwing (such as smoothly like assembling a nut, or a bit tighter while applying some resistance) can be freely controlled. We will create a prototype based on your request for your evaluation. The terminal on the left side is an open-end with a pitched coil. Our company handles the manufacturing, design, and prototyping of springs. Our technical staff will respond carefully, so please feel free to consult us if you have any concerns. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type B, SWP-B Wire diameter: Φ3.5 Since the order was for 10 pieces, we did not use a multi-forming machine; instead, we shaped them using a winding machine and handmade methods. The surface treatment has been applied with electroless nickel plating. If you have any issues with springs, please feel free to contact us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Polished round steel rod, SGD Wire diameter: Φ6.0 A round rod with threads cut on both ends is bent into a U-shape. We have a proven track record with similar shapes using the following materials: 1) Ordinary iron wire, SWM-F 2) Hard steel wire, SW-B, SW-C 3) Stainless steel wire, SUS304-W1 4) Spring stainless steel wire, SUS304-WPB Our company specializes in spring processing and bending of round rods. Please feel free to consult us if you have any concerns. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

Material: Piano wire type B, SWP-B Wire diameter: Φ0.8 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 spring forming. According to JIS standards, a spring index of 4 to 22 is recommended, but processing is certainly possible even below 4 or above 22. The average coil diameter of this spring is 24mm, so the spring index is 24/0.8 = 30. If you have any issues with springs, please feel free to consult us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 Fax: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Spring stainless steel wire, SUS316-WPA Wire diameter: Φ5.0 After forming, heat treatment is performed, and barrel polishing is applied to achieve a smooth surface. The barrel polishing uses a vibrating type. If you have any issues with springs, please feel free to consult us. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type B, SWP-B Wire diameter: Φ2.6 Formed using a multi-forming machine. Since the opposing angle of the left and right arms is important, we have created a dedicated inspection jig to manage the angle. If you have any issues with springs, please feel free to contact us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 Fax: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Phosphor bronze wire, C5191W Wire diameter: Φ1.4 Springs are sometimes required to have properties such as non-magnetism, electrical conductivity, and corrosion resistance. It is often difficult to satisfy these properties with iron-based or stainless steel spring materials, so copper alloys are chosen. The most commonly used material for coil springs is "phosphor bronze wire." Phosphor bronze wire exhibits "springiness" only after heat treatment, so it must undergo heat treatment after forming. The heat treatment temperature is around 250 degrees and is referred to as low-temperature annealing. (For more information on phosphor bronze wire, please refer to the related links.) If you have any concerns regarding springs, please feel free to contact us. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type A, SWP-A Wire diameter: Φ0.6 The double torsion spring has a shape that connects two torsion springs. The arms at both ends are not parallel and are angled inward, which is based on customer requests. To prevent rust, it is coated with electroless nickel plating. If you have any issues with springs, please feel free to consult us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 Fax: 0235-22-0546 Email: web@tohj.com

• Spring

Material: Piano wire type B, SWP-B Wire diameter: Φ7.0 If you have any issues with springs, please feel free to contact us. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Spring

This product is used as an antenna rather than as a so-called spring. The material used is "hard steel wire, SW-C." A representative of iron-based spring materials is piano wire. Piano wire is used for springs that require severe durability, such as clutch springs and brake springs. Hard steel wire has lower durability compared to piano wire, but it is a cost-effective material with good workability. It is mainly used for springs under static loads, as well as for fittings and wire forming products. (For static loads, please refer to the related links.) If you have any issues with springs, please feel free to consult us. Turuoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

Material: Hard steel wire - SW-C Wire diameter: Φ2.0 It is shaped using a multi-forming machine. The surface treatment is done with electroless nickel plating. If you have any issues with springs, please feel free to consult us. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 Fax: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

Material: Piano wire type A, SWP-A Wire diameter: 1.4 mm The shape of the hooks at both ends is U (you) hook. The right side has a standard shape, but the left side has a special shape where the hook is formed outside of the body. If you have any issues with tension springs, please feel free to consult us. Our technical staff will respond carefully. Springs and spring manufacturing by 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

When processing spring materials, residual stress occurs within the material. If this residual stress is left untreated, the spring will attempt to return to its original shape, resulting in deformation over time. To avoid this phenomenon (springback), stress relief heat treatment is always performed after spring forming. Higher heat treatment temperatures are more effective at removing residual stress. However, spring materials have the characteristic that their strength decreases sharply when exposed to temperatures exceeding 450 degrees Celsius. Therefore, the stress relief heat treatment for springs is conducted at relatively low temperatures ranging from 200 to 450 degrees Celsius. This heat treatment is referred to as "low-temperature annealing." (In our spring manufacturing field, we call it tempering.) Materials such as piano wire, which are iron-based, develop a layer of iron oxide on the surface due to low-temperature annealing, and the color changes from brown to deep blue (as shown in the photo) as the heat treatment temperature increases. Because of this blue coloration, low-temperature annealing is sometimes referred to as bluing treatment. However, in the case of stainless steel, there is not much color change even after heat treatment, so the term "bluing" does not seem appropriate as a description for heat treatment of springs in general.

• Contract manufacturing

Material: Spring stainless steel wire - SUS304-WPB Wire diameter: Φ1.2 The ends of a compression spring are called "seat coils." Typically, seat coils consist of one turn each, with the ends attached to the adjacent coils. (This is referred to as a closed end.) This spring has three turns of seat coil on one side only. To press-fit a fixing shaft into this seat coil section, the inner diameter tolerance of the seat coil section is managed at +0.2, -0. The opposite side (the front side) has a standard one-turn seat coil. 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 double torsion spring has a shape consisting of two twisted coil springs and is also referred to as a double kick spring. The material of this spring is "piano wire type B, SWP-B," with a wire diameter of Φ2.0. It is formed using a multi-forming machine, and to align the winding angles of the left and right coils, an angle control sensor is used. The surface treatment is electroless nickel plating. If you have any issues with double torsion 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 conferencing.

• Spring

Material: Piano wire type A, SWP-A Wire diameter: Φ3.5 In springs, stress (load) during use tends to concentrate in areas where there are changes in shape. In tension springs, stress is likely to concentrate at the base of the hook, which can lead to issues such as breakage at the hook part. The hook of this spring is shaped like a U-hook. To avoid problems caused by stress concentration, we have processed the bending radius at the hook's rise to be larger. If you are having trouble with tension springs, please feel free to consult us. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

The torsion spring in the photo was designed and prototyped by our company. We designed the specifications to meet the design conditions you provided below: 1) Coil inner diameter, 2) Load at installation to maximum angle, 3) Durability (1 million cycles) The designed spring can be realized in a short delivery time. The spring in the photo was delivered in one week, and being able to provide prototypes in a short time is also a benefit we offer. We accept orders starting from one piece. Our company handles spring design and prototyping. If you provide us with rough design conditions, we will propose suitable specifications and manufacture prototypes. I believe some of you 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. 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

◎ Static Load The following cases apply: 1) During the use of the spring, there is no fluctuation in load (a constant load is applied). 2) There is fluctuation in load, but the number of repetitions is approximately 1,000 times or less over its lifetime. ◎ Dynamic Load Also referred to as repeated load, most springs fall into this category. The methods for evaluating the durability of springs also differ for each case. In the case of static load, the evaluation criterion is whether the material undergoes plastic deformation. The idea is that it is acceptable as long as there is no "settling" in the spring. For dynamic load, it is natural that there is no settling, and the evaluation is based on how many cycles the spring can endure before fatigue failure occurs. By the way, enduring 10 million cycles is considered equivalent to having a semi-permanent durability. The "fatigue" of metals refers to the progression of micro-cracks due to repeated loading. Typically, it does not involve plastic deformation, making it a very troublesome phenomenon that can lead to sudden failure without any prior signs of settling or deformation. This concludes a rough explanation of static and dynamic loads and their evaluation methods. If you have any points that were insufficiently explained or any questions, please feel free to contact us by phone or email.

• Contract manufacturing

This is a spring made from square wire with dimensions of 2mm x 3mm, processed through coiling. Both ends of the spring are open-ended and without grinding. The material of the square wire is "Piano Wire Type A, SWP-A." We also have a track record of similar shapes using "Hard Steel Wire, SW-C" and "Stainless Steel Wire for Springs, SUS304-WPB." Our company accepts orders for the manufacturing and design of square wire coil springs (square springs). Please feel free to consult us if you have any issues. Even if you do not have drawings, that is okay. 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.

• Spring

Material: Stainless steel wire for springs Wire diameter: Φ0.5 It is a bit difficult to see, but it has a tapered shape from the front to the back. Since the inner diameter side is used as a guide, it has been finished without burrs or sharp edges. If you have any issues with springs, please feel free to consult us. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

Using straight materials of "hard steel wire SW-C." Hard steel wire has lower strength compared to piano wire, but it is a cost-effective material with good workability. It is used in various fields, such as safety pin springs, bed springs, and reinforcement wires for rubber hoses. Our company specializes in processing and forming hardware like this product. To avoid initial costs, we combine standard parts for bending molds and tools as much as possible, allowing for affordable and expedited prototype responses. Please feel free to consult us if you have any concerns. It's okay if you don't have drawings or plans. Our technical staff will respond carefully. Springs and springs by Tsuruoka 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 is stainless steel wire, SUS303 round bar (Φ1.4). It is grooved to a width of 0.4 x 0.1 mm (indicated by the arrow), and after forming processing, it will be cleaned with ultrasonic cleaning to remove contaminants before shipment. Our company offers forming processing and bending of round bars. Please feel free to consult us if you have any concerns. Tsuruga Spring Co., Ltd. for springs and springs Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

• Spring

This is a space-saving spring used to secure work in narrow gaps. It is formed flat in a wave shape rather than in a coil shape. The material used is "spring stainless steel wire SUS316-WPA," which has better corrosion resistance than "SUS304-WPB" and is commonly used for springs in food factories and chemical plants. After spring forming, heat treatment (low-temperature annealing) is applied to relieve stress. Springs of the same shape have been processed using "piano wire (SWP-A, SWP-B)," "hard steel wire (SW-C)," and "phosphor bronze wire (C5191W)." If you have any issues with springs, please feel free to consult us. 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 used for the protection of cables and similar items. It is used by passing cables or hoses through the inner diameter of the spring. Unlike pipes, it allows for a certain degree of bending and flexing while protecting the cables inside. Some of the longer ones exceed a total length of 4 meters. The material used is "spring stainless steel wire - SUS304-WPB." There are also proven results with "piano wire" and "beryllium copper wire" for springs of the same shape. If you have any issues with springs, 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

The material used is "hard steel wire SW-C." Compared to piano wire, hard steel wire has lower durability but offers good workability and is a cost-effective material. It is used in various fields such as safety pins, cushions for sheets and beds, and shutter winding springs. For applications that do not require strict durability, it can provide cost advantages compared to piano wire. This spring is designed to allow hoses or cables to pass through the inner diameter side for protection. Since it uses spring material, it can bend to some extent, functioning like a flexible pipe. The surface treatment is "electroless nickel 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 (ZOOM, Skype, Microsoft Teams, etc.).

• Contract manufacturing

This is a ring with protrusions for stopping and positioning. It utilizes spring properties and is used as a retaining ring. Since flatness when placed on a reference plate is important (to prevent rattling), we guarantee quality through a full inspection using dedicated jigs. The material used is "spring stainless steel wire, SUS304-WPB." Similar rings and retaining rings have been successfully made with "piano wire" and "hard steel wire." 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 (ZOOM, Skype, Microsoft Teams, etc.).

• Contract manufacturing

It may look like just a ring, but in fact, it is constructed by twisting the ends of a thin spring that is tightly coiled, joining them together to form a complete loop. During the twisting process, care is taken to ensure that no twisting occurs throughout the entire ring. The entire ring can stretch and contract like a rubber band, making it useful as a reinforcing spring for the sealing part. The material used is "spring stainless steel wire, SUS631-WPC." This stainless steel spring material is used when greater strength and heat resistance are required compared to the general-purpose "SUS304-WPB." To achieve the specified strength, a heat treatment known as precipitation hardening (also called aging treatment) is applied after the spring is formed. For springs of the same shape, there are processing achievements using non-magnetic and corrosion-resistant "SUS316-WPA" and iron-based spring materials such as "piano wire" and "hard steel wire." 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

• Spring

Most of the "spring stainless steel wire" has a nickel plating on its surface. The purpose of the nickel plating is to improve the sliding of the material and enhance the workability of spring processing (especially coiling processing). In fact, when coiling is done using "bare wire" without nickel plating, the material tends to stick to the mold, making the process unsuccessful. However, since "bare wire" has better corrosion resistance, there may be cases where its use is essential depending on the customer's application. The spring (part of it shown in the photo) was coiled using SUS304-WPB, and then the plating was removed. This allows for both workability (cost) and corrosion resistance to be satisfied. By performing barrel polishing as a finishing touch, a gloss like that in the photo can also be achieved. If you have any issues with springs or wire 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.

• Spring

The material used is "stainless steel wire, SUS304." We are bending a round bar with a diameter of 4.0 mm. For similar shapes, we have a track record with ordinary iron wire (SWM), polished round steel (SGD), piano wire (SWP-A), hard steel wire (SW-C), and stainless steel wire for springs (SUS304-WPB). Our company offers forming and bending processing services. Please feel free to consult us if you have any concerns. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

• Contract manufacturing

The material is "Piano Wire Type A, SWP-A," and the wire diameter is Φ3.2. The inner diameter of the hook is slightly smaller compared to the body to match the shaft it will be mounted on. Additionally, to make it easier to remove, a "handle" has been shaped at the tip of the right hook. 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 "Piano Wire Type A - SWP-A," with a wire diameter of Φ2.9. The shape of the hook is a "U hook." Along with reverse round hooks and round hooks, it is a commonly used hook shape; however, the bending radius at the upright part tends to concentrate load (stress), so it is shaped with as large a bending radius as possible. The surface treatment is trivalent chrome plating + baking (dehydrogenation treatment). If you have any issues with springs, please feel free to consult us. Our technical staff will respond carefully. Turuoka 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

This is an earth spring designed to discharge static electricity. It is made from "phosphor bronze plate - C5191P," which has high electrical conductivity, and is heat-treated after spring forming to enhance its "springiness." After heat treatment, the surface dirt is removed through a cleaning process before shipment. Our specialty lies in round wire springs and forming, but we also manufacture both in-house and externally for flat springs. The materials (spring materials) we have a proven track record with are as follows: 1) Quenched ribbon steel (SK85-CSP-H) 2) Bainite steel plate (C60C-CSP-B) 3) Stainless steel strips for springs (SUS304-CSP, SUS631-CSP, SUS301-CSP) 4) Phosphor bronze plate (C5191P), spring phosphor bronze plate (C5210P) 5) Beryllium copper plate for springs (C1720P) 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

This is a component of an accessory (earrings) made from "tin bronze wire C5191W." "Tin bronze wire" is a copper alloy wire with high electrical conductivity and excellent corrosion resistance and plating properties. Due to these characteristics, it is used as a material for springs in electronic and communication devices. Additionally, its good workability and ease of soldering make it commonly used in accessories like this one. Our company specializes not only in springs but also in wire forming like this product. This item is mass-produced using NC machines, but we also accept orders starting from just one piece. 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