Extension Springs

Extension springs are primarily used in medical ventilator, hand tools and home care equipment for storing energy and exerting a pulling effect. The extension spring must be attached to a device or component, and its end may be a loop or a hook.

KLF provides customized extension springs in the following range:

Shape and size	End type	Material
Wire diameter: 0.1-6.0mm * Round Wire * Square Wire * Rectangular Wire * Special Section Wire	* V-hook over center* Full loop at side* Half loop over center * Small eye at side * Double full loop at side and Special customized	* Carbon steel wire * High carbon steel wire * Stainless steel wire * Nickel plating stainless steel wire etc

Extension Springs Examples

65Mn Steel Extension Spring for Hand Grip
Wire diameter: 1.2mm
Material: 65Mn steel wire
Recommended application: Hand Grip Exerciser

65Mn Steel Extension Spring for Book Stapler
Wire diameter: 0.6mm
Material: 65Mn steel wire (color zinc-plated)
Recommended application: book stapler

65Mn Steel Extension Spring for Manual Jigs
Wire diameter: 0.9mm
Material: 65Mn steel wire
Recommended application: Manual jigs

Manufacturing Range

KLF designs and manufactures mechanical spring according to your requirements as below, using a camless spring machine, milling machine, grinding machine and other production equipment.

Length: Overall length (O/A), Pull length (P/P) or Body length (B/L) Diameter: Outer diameter (O/D), Inner diameter (I/D), Middle diameter (M/D) Wind direction: left-hand or right -hand Ends type Material and surface treatment Tolerances and working conditions Design drawing
①Gap
②wire diameter
③length
④extension length
⑤outer diameter
⑥inner diameter Extension Springs Shape half loop over center full loop at side long round end hook over center small eye at side Extension Springs End Types Machine half hook Half loop Coned end with swivel Square hook V hook machine cut plain ends single full loop over center small offset hook at side machine half hook over center double full loop at side half loop over center full loop at side long round end hook over center small eye at side threaded plug to fit plain end spring V-hook over center extend end eye over center drawbar spring coned end with swivel bolt coned end with swivel hook Customization

All of extension springs produced by KLF are customized according to the samples, drawings or size provided by customers directly.

Material: High carbon steel wire, 301 /302 /304/ 316 stainless steel, carbon steel, nickel plating stainless steel wire or customer specified. Surface treatment: Nickel plating, tin plating, white zinc plating, silver plating, blue zinc plating, color zinc plating, etc. Corrosion control method: metal coating, chemical coating, non-metallic coating, and temporary coating. Wire diameter: 0.1-6.0mm.