GB/T 18230.3-2000: Hexagon nuts for high-strength structural bolting with large width across flats - Product grade B - Property classes 8 and 10

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Scope

This Standard specifies the hexagon nuts for structural bolting - thread specification is M12-M36, the
performance grades are 8 and 10, the product grade is B, and used with grades 8.8 and 10.9 bolts.
Other technical requirements shall be selected from current standards (such as GB/T196, GB/T197 and
GB/T3098.2).
The nuts specified in this Standard shall be matched with appropriate bolts (such as GB/T18230.1 or
GB/T18230.2), so as to effectively prevent the connectors from thread tripping due to over-twisting.
Hot-dipped galvanized nuts can provide 6H thread tolerance zone after galvanization according to the
agreement by the supplier and purchaser. 6H hot-dipped galvanized nuts must be matched with 8.8s U
or 10.9s U hot-dipped galvanized bolts, and thread tripping may occur due to over-twisting.
Note. please make sure correctly using bolt for satisfactory results. For the purpose of proper use, it is recommended to
formulate supplementary specifications for bolt connection.

Basic Data

Standard ID	GB/T 18230.3-2000 (GB/T18230.3-2000)
Description (Translated English)	Hexagon nuts for high-strength structural bolting with large width across flats - Product grade B - Property classes 8 and 10
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	8,834
Date of Issue	2000-10-17
Date of Implementation	2001-05-01
Quoted Standard	GB/T 90-1985; GB/T 196-1981; GB/T 197-1981; GB/T 1237-2000; GB/T 3098.2-2000; GB/T 3103.1-1982; GB/T 5267-1985; GB/T 5276-1985; GB/T 13912-1992; GB/T 16938-1997; GB/T 18230.1-2000; GB/T 18230.2-2000; GB/T 18230.5-2000; JB/T 5067-1999
Adopted Standard	ISO 4775-1984; MOD; ISO 8673-1999; NEQ; ISO 965-5-1998; NEQ
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard specifies: Thread specifications for M12 ~ M36, the performance rating of 8 and 10, the product grade is B, respectively, 8. 8 and 10. 9 bolts supporting the use of structural bolting with large hexagon nuts.