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ASTM A574

ASTM A574 Specification

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ASTM A574 / A574M Socket Head Cap Screws – Adfast Components

At Adfast Components, we offer high-strength quenched and tempered alloy steel hexagon socket head cap screws manufactured to meet the requirements of ASTM A574 (inch series) and ASTM A574M (metric series). This specification covers screws ranging from 0.060 inch to 4 inch in diameter, suitable for critical applications demanding superior strength and reliability.

We manufacture and supply both metric and imperial size socket head cap screws as per ASTM A574 standards, complete with EN 10204 Type 3.1 certification. These fasteners meet strict chemical composition, mechanical properties, tensile strength, and wedge testing criteria.

As part of the specification’s supplementary provisions, customers can select chemical compositions tailored to specific alloy grades, including AISI 4037, 4042, 4137, 4140, 4142, 4145, 4340, 8740, 5137M, and 51B37M.

Adfast Components ensures precision manufacturing and stringent quality control for all socket head cap screws to guarantee performance in demanding industrial applications.

Supplementary Grades

Grades
AISI 4037AISI 4042AISI 4137AISI 4140AISI 4142
AISI 4145AISI 4340AISI 8740  

Chemical Composition

ElementHeat Analysis %Product Analysis %
Carbon, min0.330.31
Phosphorus, max0.0350.040
Sulfur, max0.0400.045

Tensile Requirements for Coarse Thread Socket Head Cap Screws

Screw Dia (D), inchThreads/inchTensile Load, min, lbf AStress Area, in2BProof Load, min, lbfC
0.073644730.00263368
0.086566660.00370518
0.099488770.00487682
0.1124010900.00604846
0.1254014300.007961110
0.138321 6400.009091270
0.1643225200.01401960
0.1902431500.01752450
0.2502057300.03184450
0.31251894400.05247340
0.37516139000.077510800
0.437514191000.106314900
0.5001325 5000.141919 900
0.62511384000.22630500
0.7501056 8000.33445 100
0.8759785000.46262400
1.00081030000.60681800
1.12571290000.763103000
1.25071650000.969131000
1.37561960001.155156000
1.50062390001.405190000
1.75053230001.900256000
2.0004-1/24250002.500338000
2.2504-1/25520003.250439000
2.50046800004.000540000
2.75048380004.930666000
3.000410100005.970806000
3.25041 210 0007.100958 000
3.500414200008.3301120000
3.750416400009.6601300000
4.0004188000011.0801500000

Tensile Requirements for Fine Thread Socket Head Cap Screws

Screw Dia (D), inchThreads/inchTensile Load, min, lbf AStress Area, in2BProof Load, min, lbfC
0.0680324 252
0.07372500 389
0.08664709 552
0.09956941 732
0.112481190 925
0.125441490 1160
0.138401830 1420
0.164362650 2060
0.190323600 2800
0.250286500 5100
0.31252410400 8120
0.3752415800 12300
0.43752021400 16600
0.5002028800 22400
0.6251843500 34600
0.7501663400 50400
0.8751486500 68700
1.00012113000 89500
1.12512146000 116000
1.25012182000 145000
1.37512224000 178000
1.50012269000 213000

A Values based on 180 ksi for 0.500 and smaller and 170 ksi for sizes larger than 0.500 inch and stress area in accordance with footnote B.
B Stress aread based on handbook H-28 (U.S. Department of Commerce) as follows:
Az = 0.7854 [D – (0.9743/n)]2
Where
Az = Stress area,
D = Nominal screw size, and
n = Threads/inch.
C Values based on 140 ksi for 0.500 and smaller and 135 ksi for sizes larger than 0.500 inch and stress area in accordance with Footnote B.

Wedge Test Angles

Screw Size,
D, inch.		Wedge Angle, Deg
Body Lengths 2D
or less or
Threaded to the Head		Body Lengths
Greater than 2D
0.112 – 0.500, incl.610
0.625 – 0.750, incl.68
0.875 – 1.500, incl.46