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18-8 SS Socket Head Cap Screw

ASTM F837 stainless steel socket head cap screws (also known as Allen head screws) have a cylindrical head with a flat chamfered top surface, knurled cylindrical sides and hexagonal recess. The ASTM F837 specification covers the chemical and mechanical requirements for stainless steel inch socket head cap screws. Dimensional specifications are governed by ASME B18.3. Socket Head Cap screws require less surface area to counterbore.These fasteners are commonly used in applications in which it is necessary to recess the head of the fastener, as well as applications where space limits the size of the head, and the tool that drives the fastener. Stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. Stainless steel has a higher corrosion resistance than carbon steel.Thread lengths listed are minimum thread lengths, actual thread length may be longer. Please note that in some cases for smaller diameters, mechanical testing may not be performed and thus will not meet ASTM F837.

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Governing Standards
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Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsStainless Steel Socket Head Cap Screw

Stainless steel socket head cap screw dimensions

Per ASME B18.3-2012
Size	Nominal	UNC	UNF	D		A		H		J		LT
				Body Diameter		Head Diameter		Head Height		Hex Socket Size		Thread Length
				Max	Min	Max	Min	Max	Min	Fraction Nominal	Decimal Nominal	Min
#0	0.0600		80	0.0600	0.0568	0.0960	0.0910	0.0600	0.0570	….	0.0500	0.5000
#1	0.0730	64	72	0.0730	0.0695	0.1180	0.1120	0.0730	0.0700	1/16	0.0620	0.6625
#2	0.0860	56	64	0.0860	0.0822	0.1400	0.1340	0.0860	0.0830	5/64	0.0780	0.6250
#3	0.0990	48	56	0.0990	0.0949	0.1610	0.1540	0.0990	0.0950	5/64	0.0780	0.6250
#4	0.1120	40	48	0.1120	0.1075	0.1830	0.1760	0.1120	0.1080	3/32	0.0940	0.7500
#5	0.1250	40	44	0.1250	0.1202	0.2050	0.1980	0.1250	0.1210	3/32	0.0940	0.7500
#6	0.1380	32	40	0.1380	0.1329	0.2260	2.1800	0.1380	0.1340	7/64	0.1090	0.7500
#8	0.1640	32	36	0.1640	0.1585	0.2700	2.6200	0.1640	0.1590	9/64	0.1410	0.8750
#10	0.1900	24	32	0.1900	0.1840	0.3120	0.3030	0.1900	0.1850	5/32	0.1560	0.8750
#12	0.2120	24	28	0.2160	0.2095	0.3240	0.3140	0.2160	0.2100	5/32	0.1560	0.8750
1/4	0.2500	20	28	0.2500	0.2435	0.3750	0.3650	0.2500	0.2440	3/16	0.1880	1.0000
5/16	0.3125	18	24	0.3125	0.3053	0.4690	0.4570	0.3120	0.3060	1/4	0.2500	1.1250
3/8	0.3750	16	24	0.3750	0.3678	0.5620	0.5500	0.3750	0.3680	5/16	0.3120	1.2500
7/16	0.4375	14	20	0.4375	0.4294	0.6560	0.6420	0.4380	0.4300	3/8	0.3750	1.3750
1/2	0.5000	13	20	0.5000	0.4919	0.7500	0.7350	0.5000	0.4920	3/8	0.3750	1.5000
5/8	0.6250	11	18	0.6250	0.6163	0.9380	0.9210	0.6250	0.6160	1/2	0.5000	1.7500
3/4	0.7500	10	16	0.7500	0.7406	1.1250	1.1070	0.7500	0.7400	5/8	0.6250	2.0000
7/8	0.8750	9	14	0.8750	0.8647	1.3120	1.2930	0.8750	0.8640	3/4	0.7500	2.2500
1	1.0000	8	14	1.0000	0.9886	1.5000	1.4790	1.0000	0.9880	3/4	0.7500	2.5000
1 1/8	1.1250	7	12	1.1250	1.1086	1.6880	1.6650	1.1250	1.1110	7/8	0.8750	2.7500
1 1/4	1.2500	7	12	1.2500	1.2336	1.8750	1.8520	1.2500	1.2360	7/8	0.8750	3.0000
1 3/8	1.3750	7	12	1.3750	1.3568	2.0620	2.0380	1.3750	1.3600	1	1.0000	3.2500
1 1/2	1.5000	6	12	1.5000	1.4818	2.2500	2.2240	1.5000	1.4850	1	1.0000	3.5000
1 3/4	1.7500	5	12	1.7500	1.7295	2.6250	2.5970	1.7500	1.7340	1 1/4	1.2500	4.3800
2	2.0000	4	12	2.0000	1.9780	3.0000	2.9700	2.0000	1.9830	1 1/2	1.5000	5.0000
2 1/4	2.2500	4	12	2.2500	2.2280	3.3750	3.3440	2.2500	2.2320	1 3/4	1.7500	5.6200
2 1/2	2.5000	4	12	2.5000	2.4762	3.7500	3.7170	2.5000	2.4810	1 3/4	1.7500	6.2500
2 3/4	2.7500	4	12	2.7500	2.7262	4.1250	4.0900	2.7500	2.7300	2	2.0000	6.8800
3	3.0000	4	12	3.0000	2.9762	4.5000	4.4640	3.0000	3.9790	2 1/4	2.2500	7.5000
3 1/4	3.2500	4	12	3.2500	3.2262	4.8750	4.8300	3.2500	3.2280	2 1/4	2.2500	8.1200
3 1/2	3.5000	4	12	3.5000	3.4762	5.2500	5.2110	3.5000	3.4780	2 3/4	2.7500	8.7500
3 3/4	3.7500	4	12	3.7500	3.7262	5.6250	5.5840	3.7500	3.7270	2 3/4	2.7500	9.3800
4	4.0000	4	12	4.0000	3.9762	6.0000	5.9580	4.0000	3.9760	3	3.0000	10.0000

All dimensions are in inches.

18-8 SS Socket Head Cap Screw

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ASTM F837	This specification covers the chemical and mechanical requirements for stainless steel inch socket head cap screw (SHCS) with nominal thread 0.060 through 1.500 in. and intended for use in applications requiring general corrosion resistance.
ASME B18.3	Covers the complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Austenitic Stainless Steel		Per ASTM F837-13
Alloy Group 1, Condition CW	Nominal Thread Diameter (1)	Full-Size Product		Machine Specimen			Core Hardness (2)
		Tensile Strength	Minimum Extension (3)	Tensile Strength	Yield Strength	Minimum Elongation	Vickers	Rockwell
		ksi		ksi	ksi	%
	0.60-0.750	80 min	0.4D	80 min	40 min	25	150 min	50 HRA min

Per ASTM F837-13
Material	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Copper
Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
Alloy Group 1, UNS S30400	0.08	2.00	0.045	0.030	1.00	18.0 to 20.0	8.0 to 10.5	1.00

18-8 SS Socket Head Cap Screw

Technical Data

Governing Standards

Governing StandardsStainless Steel Socket Head Cap Screw

Mechanical Properties

Mechanical PropertiesStainless Steel Socket Head Cap Screw

Chemical Properties

Chemical PropertiesStainless Steel Socket Head Cap Screw

Dimensional Specifications

Dimensional SpecificationsStainless Steel Socket Head Cap Screw

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1/2-13 X 2 1/4 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 2 1/2 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 3 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 3 1/2 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 4 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 4 1/2 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 5 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-13 X 6 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW

1/2-20 X 2 1/2 F837 18-8 STAINLESS STEEL SOCKET HEAD CAP SCREW