1.bonnell springs units made of High Carbon Manganese Steel Wire. 2.guarantee 15 years! 3. rolled or flat packing.

Bonnell Spring Unit Specifications:

High-Carbon Manganese Steel Wire, SWRH #72 A Grade.

Wire Diameter: 1.8-2.4mm.

bonnel spring Height: 150-220mm.

Mid-Coil Diameter: 60-85mm. 

5-7 Turns.

Border and Corner Dia.: 4.0-5.0mm.

Helical Wire Dia.: 1.4-1.6mm.

Reenforced Springs,Corner Springs: 3.0 or 3.8mm.

bonnell spring being Heated Treatment by computer, High Elasticity.

ISO 9001:2000, Compression Resistance 80000 Times.

bonnell spring unit Guarantees 15 Years.

OEM.

Bonnell Spring made of high carbon manganese steel wire