IS 7906 Pt.5-1989

标准号：IS 7906 Pt.5-1989
发布日期：1989/12/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This Indian Standard ( Part 5 ) covers hot coiled cylindrical compression springs made from round bar steel which are hardened and tempered after coiling.1.2 This standard is applicable to springs having the following parameters:a) Bar diameter 'd' from 8 to 60 mmb) Outside diameter De ≤ 460 mmc) Unloaded length L0 ≤ 800 mmd) Number of active coils n≥ 3e) Coil ratio ω from 3 up to 121.3 In case the lot size exceeds 5 000, then the dimensional tolerances as given in Part 7 of this standard shall be applicable.