The nut is wider use of a fastener products, nuts, which can be divided into categories it? This article will introduce the classified information of the nut.Inch nut 1, based on the ANSI / ASME B18.2.2, ANSI / ASME B18.6.3 (mechanical nut) BSW916 JIS B 1181, according to their characteristics can be divided into: ordinary nut (FINISHED HEX NUTS) (1 / 4 or more, with 1/4 specifications) - FIN thin nut (FINSHED HEX JAM the NUTS) ((1/4 1/4 Specifications) - JAM heavy duty nuts (HEAVY HEX nUTS) (1/4 with 1 / 4 Specifications) - the HVY mechanical nut (MACHINE SCREW the NUTS) (# 4-40-3 / 8 specifications) --M/S2 US-made nut distinction between: Normal, heavy, thin nut its manufacturability specifications 1/4-1 1/2, the mechanical-type nut manufacturing specifications for less than 3/8 inch nut differ from each other mainly in the thickness of the edge is also slightly different. a thin nut and ordinary type of side the same, but the thickness of the thin nut than ordinary nut thickness smaller mechanical nut side than the ordinary type nut thickness than the thin, smaller than the ordinary type. C, heavy-duty nut side than mechanical nuts large, thickness thickened, slightly less than the thickness of title diameter.Thread Accuracy class:1, Metric (DIN, ISO, GB) 6H, 6G level. Ordinarily 6H level. The metric system Japanese Standard (JIS) is divided into Ⅰ, Ⅱ grade, Ⅲ grade three. Ordinarily Ⅱ. 2, inch 1B, 2B, 3B normal conditions 2B Level. 3 Tapping use to the teeth attack of Asan angle of two kinds: 600 and 550,600 metric dental Inch UNC UNF, 550 Webster's teeth BSW, BSF. 4, the main geometric parameters of the thread: large diameter screw from the teeth, pitch diameter, thread rise angle. The above points are affecting threaded accurac

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