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Grade 8 Bolt

American Standard Grade 8 bolt that is illustrated with 6 short lines on top of the bolt head, is the strongest bolt manufactured providing 150 ksi strength, having heat treatment process on its rod prior to production, and is very commonly used in heavy industries including military, aerospace, off road vehicles, tank manufacturing,… Grade 8 bolts are usually manufactured in sizes varying from 1 / 4 to 1 - 1 / 2 inch.

Hardness Max - Rockwell Hardness Min - Rockwell Tensile Min ksi Yield Min ksi Proof Load ksi Size in Bolt Grade
C35 C24 120 92 85 1/2 -1 ASTM A 325
C31 C19 105 81 74 1 1/8 -1 1/2 ASTM A 325
C39 C33 150 130 120 1/4 - 1 1/2 SAE J429 Grade 8

Bolt and nut

Grade 8 Bolt