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

Technical data Send your request for quotation

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 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

Full list of Suppliers of Hex bolts and screws, 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.

Netherlands

Triofast BV

Distributor of standard and special fasteners.

The company supplies fasteners with various types of thread: UNC, UNF, BSW and BSF. The products meet standards such as ISO, DIN, ASTM, ANSI and BS.

Brazil

ASSISPAR INDÚSTRIA E COMÉRCIO DE PARAFUSOS LTDA.

Manufacturer of screws both in metric and inch sizes. Sizes from M3 to M64 with lengths up to 850mm

Thailand

Bangkok Fastening Co. Ltd.

Manufacturer of hex head screws, carriage bolts and socket cap screws

Italy

BULLONERIA BELLICINI srl

Manufacturer of hot forged fasteners and nip bolts, from M20 to M64

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

Fürniss GmbH

Distributor of aerospace fasteners

Taiwan

JINN HER ENTERPRISE CO. LTD

Manufacturer of standard and special fasteners, from M4 to M30, from 1/4' to 1-1/4'. Lengths from 10 to 300mm and from 1/2' to 12'.

South Korea

KPF Korea Parts & Fasteners

Leader manufacturer of hexagon head screws for costruction and high tensile screws. Diameters from M12 to M36. Production plants in Korea, Vietnam and China

USA

Lamons Corporate Headquarters

Manufacturer of gaskets and inch fasteners

London Screw Company

Manufacturer of screws, threaded studs and threaded rods in metric and inch sizes

India

MARUTI INTERNATIONAL

Manufacturer of screws, nuts, washers and threaded rods

China

NINGBO JINDING FASTENING PIECE CO.LTD.

Manufacturer of hexagon head screws, socket cap screws, high strength fasteners

Annual capacity of 120,000 tons

Turkey

OBEL CIVATA SAN. ve TiC.

Manufacturer of metric and inch size fasteners

Germany

Peter Schröder GmbH

Distributor specialized in inch thread fasteners

Germany

Pfitzer Verbindungstechnik Gmbh

Distributor of inch sized fasteners, oil and gas fasteners and turned special screws

Iran

Sahand Foulad

Manufacturer of stud bolts and fasteners both standard and special. Oil&gas and railway sector

Germany

ScrewCorner Fastener - Superstore

Distributor of inch fasteners as per British and American standards

China

SHANGHAI PRIME MACHINERY CO.LTD

One of the largest fasteners manufacturer and exporter in China.

Hexagon and socket screws, high strength hex bolts (ASTM GR5 and GR8, DIN and ISO CL.8.8 and 10.9)

The surface plating includes Black, Zinc Bright, Zinc Yellow, Hot Dip Galvanize, Dacromet, Geomet and others.

Smith Bullough

Manufacturer of special cold and hot forged nuts and bolts: Metric, UNF, UNC, BSF & BSW (Whitworth) threadforms

Chile

SODIPER LTDA.

Manufacturer of structural boltings, inch sizes

India

Sundram Fasteners Limited

Leading manufacturer of standard and special high tensile fasteners, supplier of leading customers in the automotive and industrial sectors.

India

SUPER ENGINEERS

Manufacturer of Hexagon head fasteners, flanged head screws, hammer head screws.Diameters M4÷M12. carbon iron and carbon steel

USA

The Auto Bolt Co.

Manufacturer of automotive fasteners and cold forged fasteners both in metric and inch sizes

USA

The Dyson Corporation

Manufacturer of inch bolts, nuts and stud bolts. Diameter from 3/4″ up to 26″ and lenghts from 1″ up to 36″

Mexico

Tornillos y Tuercas R.M. S.A. de C.V.

Manufacturer of steel bolts, sizes from No.4 until 1-1/4” and lengths from 1/4” until 20”.

Thailand

Tycoons Worldwide Group

Manufacturer of drywall screws, selftapping, selfdrilling and machine screws, hex head and sockets, threaded rods. Metric and inch sizes

India

Uniloc Fasteners

Manufacturing and exports of High Tensile Automotive & Industrial Fasteners.

Our products also include stainless steel standards and specials, forged and machine parts.

USA

United Steel and Fasteners

Manufacturer of all types of fasteners ranging in size from 3/8” to 4-1/4” for railroad, waterworks and industrial sector

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The portal for fasteners and fixing elements

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

ASSISPAR INDÚSTRIA E COMÉRCIO DE PARAFUSOS LTDA.

Bangkok Fastening Co. Ltd.

BULLONERIA BELLICINI srl

Earnest Machine

FASTENAL EUROPE SRL

Fürniss GmbH

JINN HER ENTERPRISE CO. LTD

KPF Korea Parts & Fasteners

Lamons Corporate Headquarters

London Screw Company

MARUTI INTERNATIONAL

NINGBO JINDING FASTENING PIECE CO.LTD.

OBEL CIVATA SAN. ve TiC.

Peter Schröder GmbH

Pfitzer Verbindungstechnik Gmbh

Sahand Foulad

ScrewCorner Fastener - Superstore

SHANGHAI PRIME MACHINERY CO.LTD

Smith Bullough

SODIPER LTDA.

Sundram Fasteners Limited

SUPER ENGINEERS

The Auto Bolt Co.

The Dyson Corporation

Tornillos y Tuercas R.M. S.A. de C.V.

Tycoons Worldwide Group

Uniloc Fasteners

United Steel and Fasteners

Zhejiang Zhapu industrial Co.Ltd. WASHAN FASTENERS