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Bolt standard ASTM A490

ASTM A490 Covers heavy hex bolts also known as structural bolts made of alloy steel with minimum 150 ksi strength.

ASTM A490 bolts are designed for building structures and usually are partially threaded with a shank longer than standard hex bolts. ASTM A490 standard bolts are very closed in structure and application to A325, However they have higher tensile and strength. This standard of hex bolts should not be processed for hot deep galvanization to avoid hydrogen embrittlement. Therefore, in case of requirement for coating Dacromet coating is recommended.

Mechanical properties of ASTM A490 bolts are as follows:

Size inTensile ksiProof load ksiElongation %
1/2 - 1 1/2min 150-17313014
Four different types of ASTM A490 standard bolts are manufactured
Type 1Alloy steel or medium carbon steel
Type 2Withdrawn since 2002
Type 3Weathering steel
MA490 Metric standard
Also, this standard of bolts require special standard of nuts and washers that are in the table below:
NUTWASHER
Type 1Type 3type 1Type 3
A563DHA563DH3F436-1F436-3

Bolt and nut

Bolt standard ASTM A490