ASTM A574 Grade Alloy Steel Socket-Head Cap Screws

Manufacturer of ASME SA 574 Hex, Anchor, Flange, Tap and A574m Lag Bolts

ASTM A574 - 17

Standard Specification for Alloy Steel Socket-Head Cap Screws

ASTM A574 specification covers the requirements for quenched and tempered alloy steel socket-head cap screws. ASTM A574 screws shall be fabricated from steel made to fine grain practice and shall be alloy steel conforming to the chemical composition specified. Different tests shall be conducted in order to determine the following mechanical properties of screws: tensile or wedge strength, proof load, yield strength, elongation, Rockwell hardness, and Vickers hardness.ASTM A574 Bolts

ASTM A574 bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. ASTM A574 Hex Bolts and ASTM A574 Hex Head Bolts is some of the toughest fasteners. These ASME SA574 sturdy fasteners are used to connect heavy materials.

Searching for a smaller or ASTM A574 large machined fastener?  Contact Hitesh Steel, we can produce as per your specification and requirements.

1. ASTM A574 Scope

1.1 ASTM A574 specification 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.

1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 The following hazard caveat pertains only to the test method portions, sections 5.1, 5.6, 8, and 12, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Property Less than, or equal to, 0.500" dia. Greater than 0.500" dia.
Tensile or Wedge tensile strength, ksi min 180 170
Proof Load (stress), ksi 140 135
Rockwell (HRC) 39 - 45 37 - 45

Property Less than, or equal to, 0.500" dia. Greater than 0.500" dia.
Yield strength at 0.2% offset, ksi min 153 153
Tensile Strength, ksi min 180 170
Elongation in 5D, min 10% 10%
Reduction of Area, min 35% 35%

ASTM A574 Bolts Chemical Composition

Element Heat Analysis % Product Analysis %
Carbon, min 0.33 0.31
Phosphorus, max 0.035 0.040
Sulfur, max 0.040 0.045

ASTM A574 Grades

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


One or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium shall be present in sufficient quantity to ensure that the specified strength properties are met after oil quenching and tempering. As a guide for selecting material, an alloy steel should be capable of meeting the specified requirements if the "as oil quenched" core hardness one diameter from the point is equal to or exceeds 25 HRC + (55 x carbon content).

ASTM A574 Specification

ASTM A574 Bolt Type ASTM A574 Anchor Bolt, Carriage Bolt, Flange Bolt, 12 Point Bolt, Hex and Hex Flange Bolts, Hex Head Cap Screw, Place Bolt, Socket Head Cap Screws, Hanger Bolt, Hexagon Bolt / Tap Bolt, Lag Bolt, Machine Bolt, Plow Bolt, Shoulder Bolt, Square Head Bolt, Stud Bolt, T-Head Bolt, Toggle Bolt, U-Bolt
Inch #0000 -3" (customized sizes available)
Metric M1.6 - M48
Length Customized Length
Grade Non Ferrous, 12.9, 10.9, 9.8, 8.8, 5.8, 4.6, B7, 2, 5, 8, L9
Material Brass, Bronze / Copper Base Alloy, Copper, Molybdenum, Steel, Hardened Steel, Stainless Steel, Superalloy (Inconel, 718 Bolts, Hastelloy, Monel), Titanium, Exotic Metals, Other
Method Cold forming, Hot Forging, Wire Forming
Fastener Standards ASME / ANSI, BS, DIN, ISO, JIS, SAE, Other
Application Industries & uses Agriculture, Automotive, Construction and Infrastructure, Energy, Transportation
Testing Methods ASTM E38, E76 and E354, ASTM E53, E54, E62, E75 and E478, ASTM E34, E101 and E227, ASTM E 120 and E1409.
Threads Configuration ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Thread Diameters M6 to M36
Certification Dual Certified As per ASTM & ASME Codes

ASME SA 574/ A574m Bolts stockist in India- ASME, DIN, AS, BS

ASTM A574 Bolts Coatings and plating as well as plain finished oil and tempered is available as required by the end user such as Zinc plating, Cadmium plating, Xylan ® coating, Dupont Teflon ® coating, Hot Dip Galvanized coating, Auge Antifrix ® coating, Sermagard ® coating and Niwat 1000 ® plating.

Teflon coated bolts

Available standard: DIN 934, ISO 4033, DIN 975, DIN 2510, ISO 4032, DIN 936, DIN 935, ASME B18.2.2, ASME B18.2.4.6M, DIN 976, DIN 939, DIN 940, DIN 938

PTFE coated bolts

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