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See Chinese contents: GB/T 18230.3-2000 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
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.
