BS EN 26157-3-1992 紧固件的表面不均匀性.第3部分:有特殊要求的螺栓、螺钉和螺柱

标准号：BS EN 26157-3-1992
中文标准名称：紧固件的表面不均匀性.第3部分:有特殊要求的螺栓、螺钉和螺柱
英文标准名称：Fasteners - Surface discontinuities - Bolts, screws and studs for special requirements
标准类型：J13
发布日期：1992/4/1 12:00:00
实施日期：1992/4/1 12:00:00
中国标准分类号：J13
国际标准分类号：21.060.10
适用范围：1 This part of ISO 6157 establishes limits for various types of surface discontinuities on bolts, screws and studs for special requirements. It applies to bolts, screws and studs with — nominal thread diameters 5 mm and larger; — product grades A and B; — nominal lenghts l ≤ 10d (or longer if specified); — property class 12.9; — property classes 8.8, 9.8 and 10.9 when specified in product standards or agreed between supplier and purchaser. 2 Where the permissible limits for surface discontinuities indicated in clause 3 occur, the minimum values for the mechanical and functional properties specified in ISO 898-1 should still be met. When fatigue strength requirements are specified, the fatigue strength should not be lower than that obtained on bolts without defects taken from the same lot. NOTES 1 The figures in clause 3 are examples only. They apply correspond-ingly also to other types of bolts, screws and studs. 2 The individual figures show the surface discontinuities exaggerated in some cases for clarity.