What we manufacture
Cylindrical, conical, barrel and hourglass compression springs, in closed-and-ground, closed-unground, and open (plain) end styles. Coiled on CNC spring-forming machines and ground to length where the application calls for a flat, square bearing surface.
Specifications to send us
The more of these you can provide, the faster we can quote:
| Spec | What to tell us |
|---|---|
| Wire diameter | mm or inch |
| Outside / inside diameter | whichever is the controlling constraint in your assembly |
| Free length | uncompressed length |
| Solid height | if it matters for your application |
| Active coils | or total coils if you don't know the exact active count |
| End type | closed & ground / closed unground / open |
| Load at a specified length | this defines the spring rate — the single most important functional spec |
| Material | see options below |
| Tolerance | which dimensions are functional; we hold DIN 2095/2096 or JIS B 2704 as standard |
| Surface treatment | plating, passivation, coating, or none |
| Annual quantity | prototype, trial batch, or production volume |
Don't have a formal drawing? Send a physical sample or a sketch with whatever load or space constraint you know, and our engineers will help formalize the spec before quoting.
Materials
Music wire (ASTM A228), hard-drawn wire, oil-tempered wire, stainless steel 302/304/316/17-7PH, chrome silicon, chrome vanadium, phosphor bronze, beryllium copper, and Inconel X-750. Special alloys are solvable in most cases — ask if yours isn't listed.
Manufacturing & inspection
Formosa Spring coordinates production rather than running every machine ourselves — each order goes to the factory in our network best equipped for that wire diameter, tolerance, and volume, and we manage engineering communication, quality, and logistics as your single point of contact. Dimensional inspection, load testing at the spec'd length, and material traceability are standard; salt-spray testing and PPAP-style documentation are available on request. See our Quality & Material Traceability page for the full detail.
How ordering works
- Send your drawing (PDF/STEP/DXF), a sample, or your load and space requirements through our RFQ form.
- Our engineers review manufacturability 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).
