Standard ASME B18.2.1 TABLE 1

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Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Square Head Bolts Table 1
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	H basic	E min	b (l< 6')	b (l> 6')	F basic	G basic
1/4	20	28	11/64	0.237	0.75	1	3/8	0.498
5/16
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


Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Askew Head Bolts Table 6
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	H1 min	H ref	E min	LT (l< 6')	LT (l> 6')	G min	F basic
3/8
1/2
5/8
3/4
7/8
1

Standard ASME B18.2.1 TABLE 4

Askew head boltsInformation restricted to registered users: Login | Register now for a 14 day free trial

Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Askew Head Bolts Table 6
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	H1 min	H ref	E min	LT (l< 6')	LT (l> 6')	G min	F basic
3/8	16	24	0.277	0.25	0.36	1	1.25	0.747	0.563
1/2
5/8
3/4
7/8
1

Square head bolts, inch series

Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Square Head Bolts Table 1
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	H basic	E min	b (l< 6')	b (l> 6')	F basic	G basic
1/4	20	28	11/64	0.237	0.75	1	3/8	0.498
5/16	18	24	13/64	0.298	0.875	1.125	1/2	0.665
3/8	16	24	1/4	0.360	1	1.25	9/16	0.747
7/16	14	20	18/64	0.421	1.125	1.375	5/8	0.828
1/2	13	20	21/64	0.482	1.25	1.5	3/4	0.995
5/8	11	18	27/64	0.605	1.5	1.75	15/16	1.244
3/4	10	16	1/2	0.729	1.75	2	1 1/8	1.494
7/8	9	14	19/32	0.852	2	2.25	1 5/16	1.742
1	8	12	21/32	0.976	2.25	2.5	1 1/2	1.991
1 1/8	7	12	3/4	1.098	2.25	2.75	1 11/16	2.239
1 1/4	7	12	27/32	1.223	2.75	3	1 7/8	2.489
1 3/8	6	12	29/32	1.345	3	3.25	2 1/16	2.738
1 1/2	6	12	1	1.470	3.25	3.5	2 1/4	2.986


Dimensions in inches (1 inch=25.4 mm) source ASME B18.2.1 - Askew Head Bolts Table 6
Publication date: 2010
d Thread size	UNC (nr of threads x inch)	UNF (nr of threads x inch)	H1 min	H ref	E min	LT (l< 6')	LT (l> 6')	G min	F basic
3/8	16	24	0.277	0.25	0.36	1	1.25	0.747	0.563
1/2	13	20	0.371	0.328	0.482	1.25	1.5	0.995	0.75
5/8	11	18	0.480	0.422	0.605	1.5	1.75	1.244	0.938
3/4	10	16	0.574	0.5	0.729	1.75	2	1.494	1.125
7/8	9	14	0.683	0.594	0.852	2	2.25	1.742	1.313
1	8	12	0.761	0.656	0.976	2.25	2.5	1.991	1.5

Full list of Suppliers of Square head bolts, inch series

Italy

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.

Distributor of prestigious brands such as UNBRAKO and NORD-LOCK, for Buora D.P.U. the service always comes first, therefore there is not minimum quantity required.

Clyde Fasteners Limited

Manufacturer of socket screws and Tee Slot Bolts both metric and imperial

Earnest Machine

Distributor of fasteners

Italy

FASTENAL EUROPE SRL

We offer logistics and inventory management and integrated supply chain management services covering a wide market of OEM fasteners (KanBan), MRO and Personal Protective Equipment (Vending Machine).

Germany