GB/T 5779.3-2000: Fasteners. Surface discontinuities. Bolts, screws and studs for special requirements

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Scope

1.1 The limits, which are specified in this standard, apply to various types of surface
defects of bolts, screws, studs with special requirements.
Applicable bolts, screws, studs:
The nominal diameter of the thread is equal to or greater than 5 mm;
Product grades A and B;
Nominal length l ≤ 10d (or longer according to special requirements);
Performance grade 12.9;
Performance grades 8.8, 9.8, 10.9, but shall be specified in the product standard OR in
the agreement between the supplier and the buyer.
1.2 Even if the surface defects reach the allowable limits, which are specified in Chapter
3, the mechanical and working properties of the product shall still meet the minimum
requirements of GB/T 3098.1. In addition, it shall meet the dimensional requirements
of the corresponding product standards.
When the fatigue strength is required, the fatigue strength shall not be lower than that
which can be achieved by bolts without defects, in the same batch of products.
Note:
1 The Figures in Chapter 3 are examples only. They apply accordingly to other types of bolts,
screws, studs.
2 Some surface defects are exaggerated for clarity.
idt ISO 6157-3:1988
Replacing GB/T 5779.3-1986

Basic Data

Standard ID	GB/T 5779.3-2000 (GB/T5779.3-2000)
Description (Translated English)	Fasteners. Surface discontinuities. Bolts, screws and studs for special requirements
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J13
Classification of International Standard	21.060.10
Word Count Estimation	17,196
Date of Issue	2000-09-26
Date of Implementation	2001-02-01
Older Standard (superseded by this standard)	GB/T 5779.3-1986
Quoted Standard	GB/T 90-1985; GB/T 1031-1995; GB/T 2828-1987; GB/T 3098.1-2000; GB/T 15239-1994
Adopted Standard	ISO 6157-3-1988; IDT
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard applies to: Particular requirements Bolts, screws and studs all types of surface defects. Applicable Bolts, screws and studs: nominal diameter equal to greater than 5mm, Product grades A and B, would call length l �� 10d, performance rating 12. 9,