Import China Constant Rolling Springs — Buy in Bulk from Supplier in China

The China constant rolling springs from Taian Henson Metal Co., Ltd. are precision-wound torsion springs designed to deliver near-constant torque over extended deflection. They are manufactured in stainless steel, with diameters ranging from 0.13mm to 14mm, and are typically used in retractable mechanisms, leashes, and small torque devices. These springs operate by unwinding from a spool, maintaining force within ±5% variation over 180 to 360 degrees of rotation, depending on wire gauge and coil count.

The springs are wound from cold-drawn stainless steel wire, commonly grades 302, 304, or 316, with tensile strength between 1,400 and 2,200 MPa. Surface finish is typically bright or passivated, with no coating specified. Typical tolerances for wire diameter are ±0.005mm, and coil spacing is controlled to ±0.1mm. The number of active coils and inner diameter determine torque output. No supplier-specific metallurgical data is confirmed; these values reflect standard industry parameters for constant force springs.

These springs are purchased by manufacturers of pet products, automotive retractors, medical devices, and industrial tape measures. Buyers typically order between 5,000 and 50,000 units per batch, with packaging in cardboard boxes or plastic reels. Delivery lead time is estimated at 20-35 days after order confirmation. Trade terms are commonly FOB Qingdao or CIF destination. MOQ is flexible, but exact minimums are not stated. Buyers must confirm torque tolerance, end configuration, and winding direction.

Taian Henson Metal Co., Ltd. is located in Taian, China, with a verified harbor trust tier and imported supplier status. The company profile does not disclose years in business, workforce size, annual production volume, or client references. It is listed as a manufacturer of constant rolling springs, with no certifications, factory photos, or quality control procedures stated. The source provides only the company name, address, and product category, with no response rate or contact history available.

There is no evidence of ISO certification, in-house testing equipment, or R&D capability in the provided data. The supplier appears to operate as a producer of precision metal springs, but no documentation confirms material traceability or batch testing. Buyers must request material certificates, torque test reports, and dimensional inspection records directly. The absence of response metrics suggests direct communication is essential before ordering.