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Our factory is specialized in manufacturing torsion springs for garage door, rolling up door, industrial door, and make torsion spring according to DIN. We can also produce springs according to customer requirements with series quality grade and also at a reasonable price .
Quality Control: The enterprise has fully implemented ISO 9001:2008 international quality management system.
The Specification of spring: 1.75'' 2.0'' 2.625'' 3.75'' 5.25'' 6'' etc. Materials: DIN 17223, JIS G3522, GRS3522. Wire Diameter: ø4.0~ø13mm.The series of door springs we developed are equal to the spring that made in Germany. Excellent quality, competitive price; high strength and long lifetime.
The Surface Treatment:
The common specifications (ID.): 1.75'',2.0'',2.625'', 3.75'',6.0''. Surface treatment contains anti-rust oil,Shot peented (kugelgestrahlt),Galvanised( white zinc, colored zinc), electrophoresis, common paint, automotive topcoat. We can use surface treatment method according to customer choice.
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