Specification | Class | Material | Nominal Size Range (in.) |
Mechanical Properties | |||||
Minimum Tempering Temperature °F |
Tensile Strength, min, ksi [MPa] |
Yield Strength, min, ksi [MPa] (0.2 % offset) |
Elongation in 2 in. or 50 mm min, % |
Reduction of Area, min, % |
Hardness max |
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ASTM A320 Grade L7 |
Bolts, Screws, Studs for Low-Temperature Service |
AISI 4140 4142 or 4145 |
2-1⁄2 and underA | 1100 | 125 | 105 | 16 | 50 | 321HBW or 35HRC |
ASTM A320 Grade L43 |
AISI 4340 | 4 and underA | |||||||
ASTM A320 Grade L7M |
AISI 4140 4142 or 4145 |
2-1⁄2 and underA | 1150 | 100 | 80 | 18 | 235HBWB or 99HRB |
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ASTM A320 Grade B8 |
Class 1 Class 1A |
AISI 304 | all diameters | -- | 75 | 30 | 30 | 50 | 223HBWD or 96HRB |
ASTM A320 Grade B8T |
AISI 321 | ||||||||
ASTM A320 Grade B8M |
AISI 316 | 192HBW or 90HRB | |||||||
ASTM A320 Grade B8 |
Class 2 | AISI 304 AISI 321 |
3⁄4 and under | -- | 125 | 100 | 12 | 35 | 321HBW or 35HRC |
over 3⁄4 to 1 incl | -- | 115 | 80 | 15 | 30 | ||||
ASTM A320 Grade B8T |
over 1 to 11⁄4 incl | -- | 105 | 65 | 20 | 35 | |||
over 11⁄4 to 11⁄2 inclA | -- | 100 | 50 | 28 | 45 | ||||
ASTM A320 Grade B8M |
AISI 316 | 3⁄4 and under | -- | 110 | 95 | 15 | 45 | ||
over 3⁄4 to 1 incl | -- | 100 | 80 | 20 | 45 | ||||
over 1 to 11⁄4 incl | -- | 95 | 65 | 25 | 45 | ||||
over 11⁄4 to 11⁄2 inclA | -- | 90 | 50 | 30 | 45 |
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