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Grade 5 Bolt

American Standard Grade 5 bolts have three lines on top of the bolt head and are manufactured of medium carbon rods and have tempering process. Grade 5 bolts have significantly lower strength compared to grade 8 bolts and are often used in machinery industry.

Grade 5 bolts provide 120 ksi tensile strength for diameters lower than one inch and 105 ksi for diameters higher than one inch.

Hardness Max - rockwell Hardness Min - rockwell Tensile Min ksi Yeild Min ksi Proof Load ksi Size in Bolt Grade
B100 B80 74 57 55 1/4 -3/4 SAE J429 Grade 2
C31 C19 105 81 74 1 1/8 -1 1/2 SAE J429 Grade 5

Bolt and nut

Grade 5 Bolt