Die mould spring made as per ISO10243 and JIS B5012standard. Size:outside diameter: 10 - 100mm Coulor: green, blue, red, yellow, brown accoding the axial load from light to heavy this spring is rectangular section wire. 50crva,50crsi,55crsi hardness after hardened HRC44-46 We produce spring use imported material, the working life is ove1400000 cycles. this spring can replace italy and jis springs, but price is half ??widely used in the punching moulds, metal die-casting moulds, plastic injection moulds and mechanical equipment with rigid structure