標準號:BS EN 26157-3-1992
中文標準名稱:緊固件的表面不均勻性.第3部分:有特殊要求的螺栓、螺釘和螺柱
英文標準名稱:Fasteners - Surface discontinuities - Bolts, screws and studs for special requirements
標準類型:J13
發布日期:1992/4/1 12:00:00
實施日期:1992/4/1 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 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.
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