Do you sell single replacement springs for an installed door closer?

No — we manufacture to order for OEMs and custom manufacturing, typically at trial-batch volumes and above. For a single replacement part, a local hardware supplier will serve you faster.

Can you match left- and right-hand wound pairs?

Yes — this is routine production for us from two decades supplying door and hinge hardware manufacturers who need mirrored pairs as standard, not a special request.

What fatigue or cycle-life testing do you do?

See our dedicated guide on door hardware spring fatigue testing, linked above, for how we approach cycle-life validation for door-motion applications.

What's the minimum order quantity for door hardware springs?

None fixed — pricing reflects actual material and processing cost, so trial batches are accepted. See our sourcing guide for small-batch door hardware springs, linked above, for what to expect at lower volumes.

Springs for Door Hardware OEMs

For OEM / custom manufacturing

This page is for door hardware manufacturers, hinge manufacturers, door closer manufacturers, and architectural hardware brands sourcing springs to a drawing or a functional spec — not for individual replacement-part orders. If you need one replacement spring for an installed door closer, a local hardware supplier will serve you faster than an overseas manufacturer.

What we produce for door hardware

Door closer springs — compression or torsion, depending on closer mechanism
Self-closing hinge springs — torsion, typically with matched left- and right-hand wound pairs for opposite-swinging doors
Floor hinge springs — heavier-duty torsion or compression depending on mechanism
Latch and lock springs — smaller compression and torsion springs for latch mechanisms
Left- and right-hand wound pairs — routine for us, not a special request

Wire diameter, material, and load/torque requirements vary by mechanism — see our dedicated torsion spring and compression spring pages for the specifications to send us.

Why door hardware is our deepest area of experience

Formosa Spring has produced door-motion return springs for two decades. Matched left- and right-hand wound pairs — needed for door closers and self-closing hinges that swing in opposite directions — are routine production for us, not a special engineering request most spring shops will hesitate over.

Engineering guides for door hardware springs

We've written up the recurring technical questions in this application in detail:

How ordering works

Send your drawing (PDF/STEP/DXF) or a sample through our RFQ form — note if you need a matched left/right pair.
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).