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ASME B18.2.1 Flange Bolt

Leader-Fastener® is a manufacturer and distributor of ASME B18.2.1 Flange Bolt. We have a complete line of service from having invested in production plants, export department and to having a quality control team and center to meet your requirements. We regard quality as the life of the company. We persist in good quality as the first policy and have established a set of quality control and inspection system according to the international standard.We have carried out ISO9001 Quality Guarantee System in every course of production, transportation and selling.We do hope we could be your partner in business by topping quality, knight service and competitive price in the near future and be your friends as well.

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Product Description

Leader-Fastener® ASME B18.2.1 Flange Bolt is an integral bolt composed of a hexagon head and a flange plate (the gasket under the hexagon is fixed with the hexagon) and a screw (a cylinder with an external thread). It needs to be matched with a nut for fastening. Parts connecting two through holes, so the bolt connection is a detachable connection. Flange bolts are composed of hexagonal heads and flanges. The "ratio of support area to stress area" is larger than that of ordinary bolts, so this kind of bolts can withstand higher preloading force and have better anti-loosening performance, so they are widely used. Used in automotive engines, heavy machinery and other products. According to the force mode of the connection, there are ordinary ones and those with reaming holes. The flange bolts used for reaming holes should be matched with the size of the holes and are used when they are subjected to lateral force. In addition, in order to meet the needs of locking after installation, there are rods with holes, these holes can prevent the bolts from loosening when they are subjected to vibration. Some flange bolts have no thread for smooth rod parts, which are called thin rod flange bolts. This kind of flange bolt is conducive to the connection under variable force.

Leader-Fastener® ASME B 18.2.1 - 2012 Hex Flange Screws

Thread Size d		1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4
PP	UNC	20	18	16	14	13	12	11	10
PP	UNF	28	24	24	20	20	18	18	16
d_s	max	0.25	0.3125	0.375	0.4375	0.5	0.5625	0.625	0.75
d_s	min	0.245	0.3065	0.369	0.4305	0.493	0.5545	0.617	0.741
s	max	0.375	0.5	0.5625	0.625	0.75	0.8125	0.9375	1.125
s	min	0.367	0.489	0.551	0.612	0.736	0.798	0.922	1.1
e	min	0.433	0.577	0.65	0.722	0.866	0.938	1.083	1.299
e	min	0.409	0.548	0.618	0.685	0.825	0.895	1.034	1.234
d_c	max	0.56	0.68	0.81	0.93	1.07	1.19	1.33	1.59
c	min	0.04	0.05	0.06	0.07	0.08	0.09	0.1	0.11
k	max	0.28	0.32	0.39	0.46	0.51	0.57	0.62	0.73
b	L≤6	0.75	0.875	1	1.125	1.25	1.375	1.5	1.75
b	L＞6	1	1.125	1.25	1.375	1.5	1.625	1.75	2
r	max	0.025	0.025	0.025	0.025	0.025	0.045	0.045	0.045
r	min	0.015	0.015	0.015	0.015	0.015	0.02	0.02	0.02

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