AISI 4040/4142 quenched and tempered. Chemical composition: C: 0.37 ~0.49; Si: 0.15~0.35; Mn:0.65~1.10; S: ≤0.035; P: ≤0.035; Cr:0.75~1.20; Mo: 0.15~0.25 Thread sizes: M16~M56 Thread screw: Cold threa - Manufacturers, Factory, Suppliers From China

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