IS 7906 Pt.7-1989

标准号：IS 7906 Pt.7-1989
发布日期：1990/1/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard ( Part 7 ) lays down permissible deviation of spring parameters of hot coiled cylindrical compression springs made from round bar steel and produced on large scale.1.2 This standard is applicable to springs meeting with the following conditions:a) Large-scale production, minimum lot size 5 000 pieces.b) Bar length (/) up to 4 300 mm.c) Bar diameter ( d) from 9 to 18 mm.d) Length of unloaded spring ( free length ) ( L0 ) up to 600 mme) External coil diameter ( De ) up to 180 mm.f) Number of active coils ( n ) from 5 to 12.g) Total spring deflection ( sc) 180 mm and more.h) Spring index (W) from 6 to 12.