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ASTM A320 Alloy Steel / Stainless Steel Stud Bolt Set

ASTM A320 Alloy Steel / Stainless Steel Stud Bolt Set
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
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
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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