These type of main shaft is widely and large quantity used in gear box . Material: Carbon ... requirementsSampling part12.5mm blow the surfaceStrength of extension700-800MPaYield strength≥625MPaFinal gauge length≥13% Reduction of area≥55%-20 low temperature ... Forged Leading products: Forging pieces, such as many types of shafts, different kinds of flanges, gear rings, brake discs , roller ,tubular parts ...