ChinaAutoRegs｜GBT 5779.3-2000 英文版/English/翻译/紧固件表面缺陷 螺栓、螺钉和螺柱 特殊要求
Fasteners – Surface discontinities – Bolts, screws and studs for special requirements
1 Scope
1.1 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 length 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.
1.2 Where the permissible limits for surface discontinuities indicated in clause 3 occur, the minimum values for the mechanical and functional properties specified in GB/T 3098.1 shall still be met. Additionally, the dimensional requirements of the relevant product standards shall also 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 correspondingly also to other types of bolts, screws and studs.
2 The individual figures show the surface discontinuities exaggerated in some cases for clarity.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below.
GB/T 90-1985 Acceptance inspection, marking and packaging of fasteners (eqv ISO 3269:1984)
GB/T 1031-1995 Surface roughness parameters and their values (neq ISO 468:1982)
GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
GB/T 3098.1-2000 Mechanical properties of fasteners Bolts, screws and studs (idt ISO 898-1:1999)
GB/T 15239-1994 Sampling procedures and tables for isolated lot inspection by attributes
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