Rotational energy within a defined working range
A power spring is a coiled strip connected between an arbor and an outer attachment or housing. Relative rotation stores energy; controlled release supplies torque to the mechanism. The usable torque and number of working turns must be considered together.
We make custom power springs for timers, mechanical music boxes, wind-up toys and moving mechanical ornaments. Our power spring range covers multi-turn rotary movement. Send us the required torque, working turns and available housing space; we can work from a drawing or sample.
Specify the torque and working turns
- Torque: required values at stated angular positions, including the minimum useful output.
- Rotation: working turns, winding direction, installation preload and travel limits.
- Envelope: arbor diameter, housing inside diameter, housing depth and assembly clearance.
- Attachments: inner and outer end geometry and the mating features.
- Duty: cycling target, speed, hold periods and operating environment.
- Supply: drawing revision, sample quantity, production quantity and schedule.
If a drawing lists only strip dimensions, also describe the installed operating range. For cord rewind projects, include the reel and cable travel details.
Materials, strip sizes and production
We work with SUS301, SUS304, SK5, 65Mn and 60Si2Mn. Across our flat-strip products, the processing range is 0.1–0.6 mm thick and 1–100 mm wide, depending on the product, material and thickness–width combination. We confirm the strip size against your spring design, required torque and available space.
We carry out strip slitting and setting heat treatment in-house. For each design, we confirm the spring construction, end attachments, tooling and inspection points before production.
Start with drawings or a sample
Send your drawing in PDF, DWG, DXF or STEP format. If you are starting from a sample, add photographs and the mating mechanism dimensions. Let us know the required torque and working turns, especially if the sample is worn or has lost its original output.
For angle-adjustment requirements, compare the spiral spring category. For cable return, review retractable cord reel springs. Send the installation drawing if you are unsure which spring type fits your mechanism.
Questions before requesting a quote
Can you develop a spring around a torque requirement?
Yes. Send the torque needed at defined angles or turns, the available space and the winding direction. Include the minimum useful torque at the end of travel so we can review the full working range.
Does every power spring produce constant torque?
Torque changes with spring design and winding position. Tell us the output needed through the working turns and the variation your mechanism can accept; these values guide the spring design.
What are the sample and production starting quantities?
A typical starting quantity is 10 samples, with a production MOQ of 500 pieces. We confirm both quantities for your product and tooling requirements. First-time custom production generally needs tooling; the quotation sets out its scope and cost.
What lead time and operating life can be quoted?
Samples generally take 7–10 days, and normal production takes 10–15 days depending on quantity and spring complexity. We confirm how days are counted, the start date and the schedule in the quotation. For life requirements, send the intended cycles and operating conditions so we can agree how the spring will be evaluated.
Discuss your spring requirements
Send a drawing or sample details with the torque, working turns and quantity you need. If some dimensions are still open, include the available housing space.