1/4-20 X 8 A574 ALLOY STEEL SOCKET HEAD CAP SCREW

$4.63183/EA

Quantity	Price
Quantity	Price
1	$4.63183/ EA
100	$4.32373/ EA
370	$3.9/ EA
1660	$2.4375/ EA

In Stock

Product Specification
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsAlloy Steel Socket Head Cap Screw

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.

ASTM A574	Covers the requirements for quenched and tempered alloy steel hexagon socket-head cap screws, 0.060 through 4 in. in diameter where high strength is required.
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.

Alloy Steel, Quenched & Tempered			Per ASTM A574-13
Nominal Diameter	Full-Size Screws		Product Hardness	Machined Test Specimen
	Tensile Strength	Proof Load	Product Hardness	Yield Strength at 0.2% offset	Tensile Strength	Elongation in 5D	Reduction of Area
	ksi	ksi	Rockwell	ksi	ksi	%	%
1/2" & under	180 min	140	39-45 HRC	153 min	180 min	10 min	35 min
over 1/2"	170 min	135	37-45 HRC	153 min	170 min	10 min	35 min

Per ASTM A574-13
Material	Heat Analysis				Product Analysis
	Carbon	Phosphorus	Sulfur	Alloying Elements	Carbon	Phosphorus	Sulfur	Alloying Elements
	% by weight	% by weight	% by weight	Alloying Elements	% by weight	% by weight	% by weight	Alloying Elements
Quenched and tempered alloy steel	0.33 min	0.035 max	0.040 max	(1)	0.31 min	0.040 max	0.045 max	(1)

1/4-20 X 8 A574 ALLOY STEEL SOCKET HEAD CAP SCREW

Technical Data

Product Specification

Governing Standards

Governing StandardsAlloy Steel Socket Head Cap Screw

Mechanical Properties

Mechanical PropertiesAlloy Steel Socket Head Cap Screw

Chemical Properties

Chemical PropertiesAlloy Steel Socket Head Cap Screw

Dimensional Specifications

Dimensional SpecificationsAlloy Steel Socket Head Cap Screw

Diameter	1/4
Length	8
Thread Length	1.0000
Grades	Alloy Steel
Finish	Black
Weight	0.1088,