This product is regulated by the following standards:

ASME B18.2.1 TABLE 3 ASME B18.2.1 TABLE 7 ASME B18.2.1 TABLE 2 ASME B18.2.1 TABLE 6

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Hex bolts and screws, Inch series

This product is regulated by the following standards:

Standard ASME B18.2.1 TABLE 3

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Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - table 3 Heavy Hex Bolts
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l> 6')	G min	F basic
3/8	16	24	-	0.25	0.360	1	1.25	0.763	0.563
1/2
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3

Standard ASME B18.2.1 TABLE 7

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Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - table 7 Heavy Hex Screws
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l>6')	G min	F basic
3/8	16	24	-	0.234	0.360	1	1.25	0.763	0.688
1/2	13	20	-	0.313	0.482	1.25	1.5	0.96	0.875
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/4
5-1/2
5-3/4
6

Standard ASME B18.2.1 TABLE 2

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Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Table 2 Hex Bolts
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l> 6')	G min	F basic
1/4	20	28	-	0.172	0.237	0.75	1	0.484	0.438
5/16	18	24	-	0.219	0.298	0.875	1.125	0.552	0.5
3/8
7/16
1/2
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4

Standard ASME B18.2.1 TABLE 6

Hex cap screwsInformation restricted to the registered users: Login | Register now for a 14-day free trial

Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 table 6 Hex Cap Screws
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	E min	E max	F basic	G min	G max	H basic	LT (l< 6')	LT (l> 6')
1/4	20	28	-	0.245	0.250	0.438	0.488	0.505	0.156	0.75	1
5/16	18	24	-	0.306	0.315	0.5	0.557	0.577	0.203	0.875	1.125
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3

Hex bolts and screws, Inch series

Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - table 2 Hex Bolts
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l> 6')	G min	F basic
1/4	20	28	-	0.172	0.237	0.75	1	0.484	0.438
5/16	18	24	-	0.219	0.298	0.875	1.125	0.552	0.5
3/8	16	24	-	0.25	0.360	1	1.25	0.620	0.563
7/16	14	20	-	0.297	0.421	1.125	1.375	0.687	0.62
1/2	13	20	-	0.344	0.482	1.25	1.5	0.826	3/4
5/8	11	18	-	0.422	0.605	1.5	1.75	1.033	15/16
3/4	10	16	-	0.5	0.729	1.75	2	1.240	1.125
7/8	9	14	-	0.578	0.852	2	2.25	1.447	1.313
1	8	12	-	0.672	0.976	2.25	2.5	1.653	1.50
1-1/8	7	12	8	0.75	1.098	2.5	2.75	1.859	1.625
1-1/4	7	12	8	0.844	1.223	2.75	3	2.066	1.875
1-3/8	6	12	8	0.906	1.345	3	3.25	2.273	2
1-1/2	6	12	8	1	1.470	3.25	3.5	2.480	2.25
1-5/8	-	-	6-8	1.094	1.591	3.5	3.75	2.616	2.438
1-3/4	5	-	6-8	1.156	1.716	3.75	4	2.893	2.625
1-7/8	-	-	6-8	1.25	1.839	4	4.25	3.099	2.813
2	4.5	-	6-8	1.344	1.964	4.25	4.5	3.306	3
2-1/4	4.5	-	6-8	1.5	2.214	4.75	5	3.719	3.375
2-1/2	4	-	6-8	1.656	2.461	5.25	5.5	4.133	3.75
2-3/4	4	-	6-8	1.813	2.711	5.75	6	4.546	4.125
3	4	-	6-8	2	2.961	6.25	6.5	4.959	4.5
3-1/4	4	-	6-8	2.188	3.210	6.75	7	5.372	4.875
3-1/2	4	-	6-8	2.313	3.461	7.25	7.5	5.786	5.25
3-3/4	4	-	6-8	2.5	3.726	7.75	8	6.198	5.625
4	4	-	6-8	2.688	3.975	8.25	8.5	6.612	6


Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - table 3 Heavy Hex Bolts
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l> 6')	G min	F basic
3/8	16	24	-	0.25	0.360	1	1.25	0.763	0.563
1/2	13	20	-	0.344	0.482	1.25	1.5	0.969	3/4
5/8	11	18	-	0.422	0.605	1.5	1.75	1.175	15/16
3/4	10	16	-	0.5	0.729	1.75	2	1.383	1.125
7/8	9	14	-	0.578	0.852	2	2.25	1.589	1.313
1	8	12	-	0.672	0.976	2.25	2.5	1.796	1.50
1-1/8	7	12	8	0.75	1.098	2.5	2.75	2.002	1.625
1-1/4	7	12	8	0.844	1.223	2.75	3	2.209	1.875
1-3/8	6	12	8	0.906	1.345	3	3.25	2.416	2
1-1/2	6	12	8	1	1.470	3.25	3.5	2.622	2.25
1-5/8	-	-	6-8	1.094	1.591	3.5	3.75	2.829	2.438
1-3/4	5	-	6-8	1.156	1.716	3.75	4	3.035	2.625
1-7/8	-	-	6-8	1.25	1.839	4	4.25	3.242	2.813
2	4.5	-	6-8	1.344	1.964	4.25	4.5	3.449	3
2-1/4	4.5	-	6-8	1.5	2.214	4.75	5	3.862	3.375
2-1/2	4	-	6-8	1.656	2.461	5.25	5.5	4.275	3.75
2-3/4	4	-	6-8	1.813	2.711	5.75	6	4.668	4.125
3	4	-	6-8	2	2.961	6.25	6.5	5.102	4.5


Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 table 6 Hex Cap Screws
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l> 6')	G min	F basic
1/4	20	28	-	0.156	0.245	0.75	1	0.488	0.438
5/16	18	24	-	0.203	0.306	0.875	1.125	0.557	0.5
3/8	16	24	-	0.234	0.369	1	1.25	0.628	0.562
7/16	14	20	-	0.281	0.430	1.125	1.375	0.698	0.625
1/2	13	20	-	0.313	0.493	1.25	1.5	0.840	0.75
9/16	12	18	-	0.359	0.554	1.375	1.625	0.910	0.812
5/8	11	18	-	0.391	0.617	1.5	1.75	1.051	0.937
3/4	10	16	-	0.469	0.741	1.75	2	1.254	1.125
7/8	9	14	-	0.547	0.866	2	2.25	1.465	1.313
1	8	12	-	0.609	0.990	2.25	2.5	1.675	1.50
1-1/8	7	12	8	0.688	1.114	2.5	2.75	1.859	1.625
1-1/4	7	12	8	0.781	1.239	2.75	3	2.066	1.875
1-3/8	6	12	8	0.844	1.363	3	3.25	2.273	2
1-1/2	6	12	8	0.938	1.488	3.25	3.5	2.480	2.25
1-5/8	-	-	6-8	1	1.613	3.5	3.75	2.686	2.438
1-3/4	5	-	6-8	1.094	1.738	3.75	4	2.893	2.625
1-7/8	-	-	6-8	1.156	1.863	4	4.25	3.099	2.813
2	4.5	-	6-8	1.219	1.988	4.25	4.5	3.306	3
2-1/4	4.5	-	6-8	1.375	2.238	4.75	5	3.719	3.375
2-1/2	4	-	6-8	1.531	2.488	5.25	5.5	4.133	3.75
2-3/4	4	-	6-8	1.688	2.738	5.75	6	4.546	4.125
3	4	-	6-8	1.875	2.988	6.25	6.5	4.959	4.5


Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - table 7 Heavy Hex Screws
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	UN (nr of threads x inch)	H basic	E min	LT (l< 6')	LT (l>6')	G min	F basic
3/8	16	24	-	0.234	0.360	1	1.25	0.763	0.688
1/2	13	20	-	0.313	0.482	1.25	1.5	0.96	0.875
5/8	11	18	-	0.391	0.605	1.50	1.75	1.175	1.063
3/4	10	16	-	0.469	0.729	1.75	2	1.383	1.25
7/8	9	14	-	0.547	0.852	2	2.25	1.589	1.438
1	8	12	-	0.609	0.976	2.25	2.5	1.769	1.625
1-1/8	7	12	8	0.688	1.098	2.5	2.75	2.002	1.813
1-1/4	7	12	8	0.781	1.223	2.75	3	2.209	2
1-3/8	6	12	8	0.844	1.345	3	3.25	2.416	2.188
1-1/2	6	12	8	0.938	1.470	3.25	3.5	2.622	2.375
1-5/8	6	-	6-8	1	1.591	3.5	3.75	2.829	2.563
1-3/4	5	-	6-8	1.094	1.716	3.75	4	3.035	2.75
1-7/8	-	-	6-8	1.156	1.839	4	4.25	3.242	2.938
2	4.5	-	6-8	1.219	1.964	4.25	4.5	3.449	3.125
2-1/4	4.5	-	6-8	1.375	2.214		5	3.862	3.5
2-1/2	4	-	6-8	1.219	2.461		5.5	4.275	3.875
2-3/4	4	-	6-8	1.063	2.711		6	4.688	4.25
3	4	-	6-8	1.875	2.961		6.5	5.102	4.625
3-1/4	4	-	6-8	2	3.210		7	5.515	5
3-1/2	4	-	6-8	2.25	3.461		7.5	5.928	5.375
3-3/4	4	-	6-8	2.375	3.710		8	6.341	5.75
4	4	-	6-8	2.5	3.960		8.5	6.755	6.125
4-1/4	4	-	6-8	2.75	4.222		9	7.168	6.5
4-1/2	-	-	4	2.875	4.472		9.5	7.581	6.875
4-3/4				3	4.722		10	7.994	7.25
5				3.125	4.972		10.5	8.408	7.625
5-1/4				3.375	5.222		11	8.821	8
5-1/2				3.5	5.472		11.5	9.234	8.375
5-3/4				3.625	5.722		12	9.647	8.75
6				3.75	5.972		12.5	10.060	9.125

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Italy|Distributor

Buora d.p.u. S.r.l.

Founded in 1969, Buora D.P.U. is a distributor certified following ISO 9001.

The company offers the complete range of high strength fasteners, ready on stock, both coarse and fine pitches with metric and inch threads.

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Suppliers of Hex bolts and screws, Inch series

Technical data

Standard ASME B18.2.1 TABLE 3

Standard ASME B18.2.1 TABLE 7

Standard ASME B18.2.1 TABLE 2

Standard ASME B18.2.1 TABLE 6

Details

Buora d.p.u. S.r.l.

Triofast BV

Pfitzer Verbindungstechnik Gmbh

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