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Bolt standard ASTM A320

ASTM A320 standard bolts are high tensile steel, Alloy Steel or stainless steel bolts aiming for high pressure tasks and are manufactured in 6 different grades. The manufacturing process for ASTM A320 standard of bolt include tempering and quenching, which as a result, has made them relatively resistant in very high and very low temperatures. ASTM A320 standard bolts are frequently used in high pressure transmission pipes, pumps, flanges , ....

ASTM A320 Mechanical Properties

Elong % min Yield Stress ksi Tensile min ksi Size Grade
16 105 125 up to 2-1/2 in L7
16 105 125 up to 4 in L43
30 30 75 All sizes B8 Class 1
12 100 125 up to 3/4 in B8 Class 2
15 80 115 7/8-1 in B8 Class 2
20 65 105 1-1/8 - 1-1/4in B8 Class 2
28 50 100 1-3/8 - 1-1/2in B8 Class 2
30 30 75 All sizes B8M Class 1
15 95 110 up to 3/4 in B8M Class 2
20 80 100 7/8-1 in B8M Class 2
25 65 95 1-1/8 - 1-1/4in B8M Class 2
30 50 90 1-3/8 - 1-1/2in B8M Class 2

Recommended nut and washer for ASTM A320 Bolt

Bolt GradeNutWasher
L7A194 Grade 4 or 7F436
L43A194 Grade 4 or 7F436
B8 Class 1A194 Grade 8SS304
B8 Class 2A194 Grade 8SS304
B8M Class 1A194 Grade 8MSS316
B8M Class 2A194 Grade 8MSS316

Bolt and nut

Bolt standard ASTM A320