... is produced through advanced automatic double wire tube making machine, wire rolling machine, hot chamber automatic die ... Supervision Inspection testing, the hose bending, wire rope elongation, breaking force, pull-out force, the bending of the flexible shaft, ... .rope and casing sliding resistance force ≤ 3Nc.casing cap and casing pull out force ≥ 70Nd. rope breaking force > 4120Ne.Steel elongation: § ...