ASTM A574 / A574M - Standard Specification for Alloy Steel Socket Head Cap Screws

This specification covers complete requirement for quenced and tempered high strength alloy steel hexagon socket head cap screws, 0.060 inch through 4 inch in diameter. ASTM A574M is a complete metric companion to specification ASTM A574. Bolting Specialist can manufacture both metric and inch sized hexagon socket head cap screws for high strength application with reference to ASTM A574 specification. We supply all boltings with EN 10204 Type 3.1 certification. ASTM A574/A574M covers chemical, mechanical, tensile, wedge test requirement, etc. As a part of supplementary requirement, this specification allows users to select chemical requirement specific to grades like AISI 4037, 4042, 4137, 4140, 4142, 4145, 4340, 8740, 5137M & 51B37M.

ASTM A574 Supplementary Grades

ASTM A453 Chemical Composition

Tensile Requirements for Coarse Thread Socket Head Cap Screws

Tensile Requirements for Fine Thread Socket Head Cap Screws

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.

Mechanical Requirements as per ASTM A574M

A Elongation is 2 percentage points higher than property class 12.9

Minimum Ultimate Tensile Loads (As per ASTM A574M)

Wedge Test Angles