Shenzhen Qianye Precision Metal is a professional manufacturer of constant force springs for a variety of applications, like doors and windows. Automatic-clock processing technics. We can ensure your product safety and quality standards will be met, because our automatic-clock processing technics, including the spring end shape-up and coil, is fully automated from Japan, but not traditional handwork, so it is credible and steady.

Materials
We use type 301 stainless steel for consistent product quality. High-carbon steel, inconel and other materials are also available. Our professional spring design and material purchasing channel lead to high quality radically.

OEM/ODM orders are welcome
The anti-tiredness capability of our constant-force spring can be up to 2, 500 rounds (for fans), 3, 000 rounds (for laptop), 4, 000 rounds (for windows and doors) as per your request. Pull force can be from 1kg to 12kg and the normal tolerance for support force extension is +/- 10%. Our monthly capacity is 3 million pieces of fan spring, 1 million pieces of laptop spring, 2 million pieces of window and door spring. You just need tell us your prospect, and our in-house design department and molding department can help you come it to true.

USA AAMA 2-level Authentication
Our exported constant-force springs have USA AAMA (American Architectural Manufacturers Association) 2-level authentication. Start sourcing from a reliable constant force spring supplier.