ChinaAutoRegs｜GBT 5779.2-2000 英文版/English/翻译/紧固件表面缺陷 螺母
Fasteners – Surface discontinuities – Nuts

1 Scope
1.1 This standard establishes limits for various types of surface discontinuities on nuts.
It applies to nuts with
— nominal thread diameters from 5 mm up to and including 39 mm;
— product grades A and B;
— all property classes according to GB/T 3098.2 and GB/T 3098.4, unless otherwise 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 3098.2, GB/T 3098.4 and GB/T 3098.9 shall still be met. Additionally, the dimensional requirements of the relevant product standards shall also be met.
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 3098.2- 2000 Mechanical properties of fasteners—Nuts—Coarse thread (idt ISO 898-2:1992)
GB/T 3098.4-2000 Mechanical properties of fasteners-Nuts-Fine pitch thread (idt ISO 898-6:1994)
GB/T 3098.9-1993 Mechanical properties of fasteners. Prevailing torque type steel hexagon nuts (eqv ISO 2320:1983)
GB/T 3098.12-1996 Mechanical properties of fasteners —Cone proof load test on nuts (idt ISO 10485:1991)
GB/T 3098.14-2000 Mechanical properties of fasteners – Widening test on nuts (idt ISO 10484:1997)

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