Umbrella metal part
Main Opening Spring
Overview
- Made by
- In-house or supply chain
- Materials
- Music wire (SWP), Spring steel, Stainless spring steel
- Finish options
- Zinc plating, Black oxide, Anti-rust oil, Passivation (stainless)
Manufacturing process & quality control points
- 1
Coiling
In-house or supply chainWire is coiled on a CNC spring machine to the specified free length, coil count and rate.
Quality control points
- Free length & coil count · Caliper + visual count · First article + 5 pcs per batch
- Spring rate / load at height · Spring tester, load at working height · 5 pcs per batch
- 2
Stress relieving
In-house or supply chainCoiled springs are stress relieved to stabilise dimensions and prevent relaxation in service.
Quality control points
- Dimensional stability · Re-measure free length after treatment · 5 pcs per batch
- 3
Ends ground square so the spring seats flat; a tilted spring binds on the shaft.
Quality control points
- End squareness · Squareness gauge / visual on surface plate · 5 pcs per batch
- 4
Zinc plating, black oxide or anti-rust oil. Corrosion of the opening spring is a known rust failure point on umbrella frames.
Quality control points
- Corrosion resistance · Neutral salt spray per buyer spec, no red rust · Per order
- 5
Springs are cycled on a rig to confirm no breakage or force decay.
Quality control points
- Cycle life · Cycle test to buyer spec, no breakage, force loss within spec · 1 pc per order
Used in
Relevant compliance
- EU REACH (SVHC)
EU
All metal & plastic parts, electroplated components and fabric coatings
- California Proposition 65
US
All products sold into California containing listed chemicals
Get a quote for Main Opening Spring
Custom materials, finishes and logos available. Send your drawing or sample.