What we manufacture
Single torsion springs and double torsion springs (two coil sections joined by a straight or offset bridge, used where a single spring can't deliver enough torque in the available space). Left-hand and right-hand wound pairs are produced to match — this is routine for us, not a special request, from two decades supplying door-hardware manufacturers.
Specifications to send us
| Spec | What to tell us |
|---|---|
| Wire diameter | mm or inch |
| Inside / body diameter | the diameter the spring winds around |
| Number of coils | body coils, not counting the legs |
| Leg length | for each leg, measured from the body |
| Leg angle | the free (unloaded) angle between legs |
| Wind direction | left-hand or right-hand; tell us if you need a matched pair |
| Torque at a specified angle | this is the functional spec — how much force, at how much deflection |
| Preload | if the spring is installed with initial deflection |
| Material | see options below |
| Application | helps us flag fatigue-life or leg-geometry issues early |
| Annual quantity | prototype, trial batch, or production volume |
Materials
Music wire (ASTM A228), hard-drawn wire, oil-tempered wire, stainless steel 302/304/316/17-7PH, chrome silicon, chrome vanadium, phosphor bronze, and Inconel X-750.
Manufacturing & inspection
Torsion leg geometry and left/right matching are checked at final inspection, along with torque testing at the spec'd angle and dimensional review of leg length and angle. Each order is routed to the factory in our network with the right coilers and tooling for the wire diameter and complexity, and we manage engineering communication, quality, and logistics as your single point of contact. Material traceability is standard; PPAP-style documentation is available on request. See our Quality & Material Traceability page for the full detail.
How ordering works
- Send your drawing (PDF/STEP/DXF) or a sample through our RFQ form.
- Our engineers review manufacturability — leg geometry and wind direction are the most common clarification points — and confirm the spec with you.
- We quote with clear pricing, tooling (if any), and lead time.
- Samples in about 4–6 weeks; production in 60–90 days.
- Inspection report, neutral packaging, and worldwide shipping (EXW/FOB/CIF/DDP).
If your torsion spring is for a door closer, self-closing hinge, or similar door-motion application, see our Door & Architectural Hardware OEM page — this is our deepest area of experience.
