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JMS:: CNC machining | Stamping | Springs > Best Quality and Trustworthy JMS Extension Spring

Best Quality and Trustworthy JMS Extension Spring

JMS Extension Spring Factory


Experienced, professional and trusty in Taiwan since 1993.

Standard or customized extension springs.


Our certification:

  • ISO 9001
  • ISO 14001
  • IATF 16949
  • D-U-N-S® Registered™ Certificate


Various springs are available for customizing.

High qualityreliability and stability guarantee.


Please send us your demand, including the drawings, material, diameter, free length, number of active coils, surface treatment, packing method, and any other detail.

Need any advanced suggestion? Feel free to contact us!


Request for Quotation




JMS Extension Spring

Extension springs are also known as tension springs. They are helical and provide the strength against the tensile force along the axis. Commonly, the cross-section of the material is round. Distance between coils is mostly tight when it is unloaded. Extension springs usually have hooks or rings on both ends for loading, ensuring the connection between items.


If you need to design an extension spring, we offer to JMS online Extension Spring Formula Calculator to assist your innovation.


They can be seen in medical devices, sports facilities, hand tools, health care, shock absorbers, pump springs, protection of machines/electricity, valves, aircraft, actuators, switches, instrument panels, etc.

Furthermore, JMS also have  CNC machines, offering the assembling of machining parts and springs.



Extension Springs:


Hooks on the ends of extension spring (round wire):  English hook, German hook, side hook, universal hook, pointed hook, U hook, swivel hook, etc.

Extension Springs:

Industry / Field

National defense industry, ocean industry, computer, eletronics, mold,
automotive industry, medical and healthcare, biochemistry,
aerospace industry, railway, power, engineer machinery,
construction machinery, etc.

Extension Springs:


Piano wire, carbon steel wire, stainless steel wire, phosphor-bronze wire, enamelled wire, etc.

Extension Springs:

Fabrication Range

0.06~10.00 mm in diameter

Flat / Round wire

Extension Springs:

Surface Treatment

Blacking, gold plating, copper plating, nickel plating, chroming, tin plating, black zinc plating, yellow zinc plating, baking varnishing, etc.

Extension Springs:


10000~1000000 times of use. Depends on the allowable stress of the material and actual load.

Factory Established Year

1993 at Shulin, New Taipei City, Taiwan

2001 at Kunshan City, China

2004 at Dongguan City, China



All process will follow the OEM's demand. If the product doesn't meet the requirement instructed from the drawings or paper document, JMS will refabricate or refund.





1. Individual Package:

One item per plastic bag

  • For the strong product with appearance concern
  • For big product



2. Mass Package:

100, 200, 500, 1000 pieces or a specific number of items in one big PE bag.

We will decide how many pieces in a bag unless further request.

  • For common product
  • For non-twisted product
  • For non-scratch-concern product

3. Tray Package

  • For fragile products with soft material

JMS offers standard trays. Special design of trays upon request with extra charge.


4. Tape on Reel

  • For  SMT machine

JMS offers standard reels. Special design of reels upon request with extra charge.


Complete Your Innovation!! Every single part can be the key to your new creation!!




Thanks for your interests in JMS Group’s products. Please feel free to contact us if you have any inquiries or opinions about metal parts, CNC machining parts, stamping parts, or springs. We are looking forward to offering you our services.


Please fill up the form below, and we will get you back as soon as possible.

Or please call us at +886-2-86866802


JMS' Product: CNC MachiningCustomized Stamping PartsCustomized Precision SpringsCustomized Metal WireStainless Straws

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