... advanced automatic double wire tube making machine, wire rolling machine, hot chamber automatic die casting machine, wire rope upset head ... National Product Quality Supervision Inspection testing, the hose bending, wire rope elongation, breaking force, pull-out force, the bending ... force ≤ 3Nc.casing cap and casing pull out force ≥ 70Nd. rope breaking force > 4120Ne.Steel elongation: § shells < 0.8%; ...