Last Updated： Aggregation Period:Jul 23, 2025～Aug 19, 2025
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Jul 23, 2025～Aug 19, 2025
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Jul 23, 2025～Aug 19, 2025
This ranking is based on the number of page views on our site.
1～15 item / All 21 items
For anything related to springs, contact Samini Co., Ltd.!
Online sales of springs and manufacturing. Various types of springs and mechanical parts. We respond quickly to custom spring orders. This is an introduction to the "tension springs for tree identification plates" handled by Samini Co., Ltd.
Support external loads with a spring and absorb vibrations with a viscoelastic material.
The non-bouncing spring, the damper tension spring, supports external loads with a bone spring and absorbs vibrations with a viscoelastic material. For more details, please contact us or refer to the catalog.
We accommodate oversized and custom springs! Please consult with us.
This is a coil spring that receives tensile loads. *Consultation is necessary regarding the shape of the hook part. Inoue Manufacturing produces everything from compression springs, torsion springs, flat springs, and tension springs to wire processing and spring shoots, even from just one piece. With our technology and experience, as well as various production facilities, we manufacture a wide range of products that meet our customers' needs, from large springs to long items. Our policy at Inoue Manufacturing is to prioritize quality and deliver products that gain satisfaction and trust from our client companies. ● For more details, please download the catalog or contact us.
Introducing our achievements in the production of tension springs with twisted hook shapes!
At Aoi Spring Co., Ltd., we manufacture long-length tension springs using our equipment in a single process. If we were to manually process one side of the hook, the costs would increase. Our company is committed to cost reduction by processing even large springs in a single operation with our equipment. Additionally, we have a variety of past production achievements, including "tension springs with a tight D/d on one side of the coil," "twisted hook tension springs," and "prototype tension springs in U-hook shape and conical coil." 【Production Achievements】 〔Type of Spring: Tension Spring〕 ■ Free length 350mm tension spring ・ Material: SWP-B φ0.3mm ■ Tension spring with a tight D/d on one side of the coil ・ Material: SWP-B φ2.6mm ■ Twisted hook ・ Material: SUS304-WPB φ1.8mm ■ Prototype tension spring in U-hook shape, conical coil ・ Material: SUS304-WPB φ0.6mm ■ Medical tension spring SUS304-WPB ・ Material: SUS304-WPB (TF) glossy material φ0.6mm *For more details, please refer to our catalog or feel free to contact us.
Introducing the causes and countermeasures for spring breakage and damage due to spring troubles!
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.
I tried to explain "initial tension" as clearly as possible.
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.
The variation in initial tension also affects the load.
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.
It has a hook shape that is strong against bending and deformation.
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
We accept inquiries and production of tension springs (pull springs).
A tension spring, also known as a "pull spring," is a type of spring that bears tensile loads and is a representative of wire springs. The hooks of tension springs come in various shapes, with reverse round hooks and U-hooks being the most commonly selected. Each hook shape of a tension spring has its own advantages and disadvantages, and the design is carried out considering processing costs (difficulty) and hook strength. Tension springs are used in a variety of applications, from large ones like the tension springs attached to stairways used at airports to smaller ones used in relay switches. In everyday life, tension springs are manufactured for applications such as those attached to salon chairs and for motorcycle stands. Unlike compression coil springs, tension springs have an initial tension. Initial tension is the force created when the wire material twists in the direction of contact during coiling formation. The initial tension of a tension spring is a unique phenomenon that occurs when coiling is done through cold forming. Depending on the coiling method, the initial tension can be made stronger or weaker. However, to achieve zero initial tension, it is necessary to coil with a slight pitch, similar to compression coil springs.
![[Case Study of Spring Manufacturing for the Electrical Equipment Industry] Tension Spring - Reverse Round Hook](https://image.mono.ipros.com/public/product/image/0b5/2000732461/IPROS76770905074455373930.png?w=280&h=280)
Wire diameter 0.7mm! Made from piano wire (SWP) and processed with an NC spring former.
We would like to introduce our manufactured "Tension Spring (Reverse Round Hook)." Generally, due to ease of manufacturing, reverse round hooks and U-hooks are often chosen, but other hooks may be adopted depending on strength and installation position considerations. They are also referred to as English hooks or American hooks. 【Case Overview】 ■Industry: Electrical Equipment ■Material: Piano Wire (SWP) ■Processing Method: NC Spring Former ■Production Lot: 3,000 pieces and up ■Size: Wire Diameter 0.7mm *For more details, please refer to the PDF document or feel free to contact us.
![[Case Study of Spring Manufacturing for the Stationery Industry] Tension Springs and Side Round Hooks](https://image.mono.ipros.com/public/product/image/597/2000732467/IPROS12132057744971415008.png?w=280&h=280)
Processed with a hooking machine! We will optimally adjust the hook shape according to the product's application.
We would like to introduce our manufactured "Tension Spring - Side Round Hook." The side round hook is adopted based on the installation position of the spring and the shape of the counterpart. We will optimally adjust the hook shape according to the application of the product. Please feel free to contact us when placing an order. 【Case Overview】 ■Industry: Stationery ■Material: Plated Wire ■Processing Method: Hooking Machine ■Production Lot: From 50,000 pieces ■Size: Wire Diameter 0.3mm *For more details, please refer to the PDF document or feel free to contact us.
![[Case Study of Spring Manufacturing for the Electrical Equipment Industry] Tension Springs and Half-Round Hooks](https://image.mono.ipros.com/public/product/image/212/2000732478/IPROS41302175010513661293.png?w=280&h=280)
Achieving a round hook with a short free length of the tension spring! This product is effective when there is no installation space.
We would like to introduce our manufactured "Tension Spring - Half Round Hook." The tension springs we produce are used in a wide range of applications, including parts for stationery and electric tools for housing and construction. A key point in the processing of this product is that it achieves a round hook despite the short free length of the tension spring. The half round hook has a gentler R compared to the reverse round hook, making it less likely to break, and it is an effective product when there is no installation space compared to the round hook. 【Case Overview】 ■ Industry: Electrical Equipment ■ Material: SUS304 ■ Processing Method: Hooking Machine ■ Production Lot: 5,000 pieces and up ■ Size: Wire Diameter 0.35mm *For more details, please refer to the PDF document or feel free to contact us.
The corresponding wire diameter is φ0.4 to φ4.0mm! We can accommodate large lots with high-speed production from mass production prototypes.
We would like to introduce the "Tension Springs" handled by Nishikawa Spring Co., Ltd. The compatible wire diameter ranges from φ0.4 to φ4.0mm. We have the equipment to fully process tension springs with English hooks and German hooks. We can accommodate large production runs from prototype mass production to high-speed production. 【Features】 ■ Compatible wire diameter ranges from φ0.4 to φ4.0mm ■ Equipped to fully process tension springs with English hooks and German hooks ■ Capable of handling large production runs from prototype mass production to high-speed production *For more details, please refer to the PDF materials or feel free to contact us.
Material: SUS, SWP, etc. Wire diameter: approximately Φ0.03 to Φ3.0 Tension spring
We can accommodate various shapes, wire materials, and surface finishes. If you have any questions, please feel free to contact us.
By simply changing the shape of the hook, the durability of the spring is improved.
The most common issue we receive inquiries about regarding springs is the breakage or damage of tension springs. In particular, most cases involve the hook or the part where it catches breaking. Tension springs have a characteristic where stress (load) concentrates at the hook, which can lead to breakage or deformation. The photo shows a spring designed and prototyped by our company in response to inquiries, aimed at preventing breakage. We considered the specifications of the spring to ensure that the stress (load) on the hook does not exceed the material's strength, and we adopted a "large round hook with a bending radius." The spring's force adjustment (spring constant, load) has not been changed. If the durability of the "large round hook with a bending radius" is still insufficient, we recommend adopting a "tapered round hook," although this will slightly increase costs. (Please refer to the related links.) If you are experiencing issues with spring breakage, damage, or deformation, please feel free to consult us. If you send us broken samples, we will propose improvement measures. We look forward to your inquiries. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com
