As an experienced OEM manufacturer with all-around custom service, we produce high-performance music wire double leg torsion spring made of premium SWP-B music wire (piano wire). This custom small torsion spring is equipped with two equal short torque arms, specially engineered to deliver consistent reset torque for appliance hinge and light rotating mechanical structures.

Our complete production workflow adopts CNC dedicated torsion spring coiling machine for integrated coiling and leg bending, followed by high-temperature stress relief tempering, wire end chamfer deburring, ultrasonic degreasing, electroplating activation, lead-free bright nickel electroplating and post-plating passivation sealing. Each nickel plated torsion spring gets full inspection on torque force, dimensional tolerance and surface finish. Our factory accepts OEM custom orders based on customers’ technical drawings or physical samples to match unique appliance hinge and industrial assembly demands worldwide.

• Household appliance hinge & door latch reset mechanisms
• Small kitchen electric equipment rotating buckles
• Office equipment internal rotating clamping parts
• Plastic housing rotating opening-closing components
• Cosmetic & daily packaging rotating hinges
• Light automation equipment miniature rotational fasteners
• Electronic consumer product reset torsion structures

As a professional custom small torsion spring manufacturer, we supply one-stop OEM custom service for all nickel plated torsion spring variants:

• Custom production of environmental nickel torsion spring from customer drawings, samples or parameter sheets
• Flexible customization of wire diameter, coil turns, outer diameter, torque arm length and bending angle
• Optional raw material upgrades: stainless steel wire, alloy spring steel upon request
• Multiple surface treatment choices: bright nickel plating, matte nickel plating, passivation sealing
• Custom private labeling, neutral bulk packaging for large OEM orders
• Low-volume pre-production prototype samples before mass manufacturing
• Flexible MOQ to support both small trial batches and large-volume wholesale orders

• SWP-B music wire raw material + high-temperature tempering: Fixes easy fatigue fracture and torque fading issues of ordinary custom small torsion spring after long repeated twisting
• Lead-free environmental bright nickel plating + passivation sealing: Eliminates quick rust, short salt spray life and harmful heavy metal risks of uncoated or cheap plated music wire double leg torsion spring
• Dedicated CNC integrated molding process: Avoids uneven coil spacing, asymmetrical dual legs and inconsistent size tolerance from manual bending nickel plated torsion spring
• Full wire end chamfer deburring: Removes sharp burrs that scratch assembly staff and scratch matching appliance hinge plastic shells
• 100% finished product torque & dimension full inspection: Solves batch torque inconsistency that causes appliance hinge reset failure and assembly scrap loss
• Eco-friendly cadmium-free nickel coating: Meets global environmental import standards, avoids customs detention for overseas appliance component buyers

• Raw material incoming inspection: Tensile strength, hardness and chemical composition test for SWP-B music wire
• In-process periodic dimensional inspection during CNC coiling and torque arm bending
• High-temperature tempering furnace temperature monitoring to guarantee uniform stress relief
• Ultrasonic cleaning residue test to remove all machining oil contaminants
• Electroplating layer thickness uniformity test for environmental nickel torsion spring
• Salt spray aging test to verify anti-corrosion performance of nickel plated torsion spring
• Final full inspection: Dimension tolerance detection, torque force testing, surface scratch & burr visual check
• Cyclic torsion fatigue testing to confirm long service life for appliance hinge operating cycles