標準號：BS EN 26157-1-1992
中文標準名稱：緊固件的表面不均勻性.第1部分:一般要求的螺栓、螺釘和螺柱
英文標準名稱：Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements
標準類型：J13
發布日期：1992/5/1 12:00:00
實施日期：1992/5/1 12:00:00
中國標準分類號：J13
國際標準分類號：21.060.10
適用范圍：1 This part of ISO 6157 establishes limits for various types of surface discontinuities on bolts, screws and studs for general requirements. It applies to bolts, screws and studs with — nominal thread diameters 5 mm and larger; — product grades A and B; — property classes up to and including 10.9, unless other-wise specified in product standards or agreed between supplier and purchaser. 2 Limits for surface discontinuities on bolts, screws and studs for special requirements (e.g. automatic assembly) are laid down in ISO 6157-3. When the engineering requirements of the application necessitate that surface discontinuities on bolts, screws and studs be more closely controlled, it should be specified in the respective product standard, or the purchaser shall specify the applicable limits in the inquiry and purchase order. 3 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. 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.