GB/T 18230.1-2000: Hexagon bolts for high-strength structural bolting with large width across flats (thread lengths according to GB/T 3106) - Product grade C - Property classes 8 - 8 and 10 - 9

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Scope

This Standard specifies the hexagon bolts for structural bolting with large width across
flats - thread specification is M12-M36, length of thread according to GB/T3106, the
performance of grades are 8.8 and 10.9; and the product grade is C.
If other technical requirements are required, it shall be selected from current standards
(such as GB/T196, GB/T197, GB/T3098.1 and GB/T3106).
The bolts specified in this Standard shall be matched with appropriate nuts (such as
GB/T18230.3 or GB/T18230.4), so as to prevent connections from thread tripping due to
over-twisting in high-level. 8.8s U1 and 10.9s U1 bolts can be used by negotiation of
supplier and purchaser. The bolts must be matched with 6H hot dip galvanizing nuts, and
the connections may cause thread tripping due to over-twisting.
Note. The satisfactory results can be achieved by making sure to correctly use the bolts. For the
purpose of proper use, it is recommended to formulate bolt connections specifications.

Basic Data

Standard ID	GB/T 18230.1-2000 (GB/T18230.1-2000)
Description (Translated English)	Hexagon bolts for high-strength structural bolting with large width across flats (thread lengths according to GB/T 3106) - Product grade C - Property classes 8 - 8 and 10 - 9
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J13
Classification of International Standard	21.060.10; 21.060.20; 21.060.30
Word Count Estimation	10,110
Date of Issue	2000-10-17
Date of Implementation	2001-05-01
Adopted Standard	ISO 7411-1984; MOD; ISO 4014-1999; NEQ; ISO 965-4-1998; NEQ
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard specifies: Thread specifications for M12 ~ M36, thread lengths according to GB/T 3106, performance rating of 8. 8 and 10. 9, Product grade C structural bolting with large hexagon head bolts.