Mechanical Properties of Inch Fasteners
ASTM A193: Alloy Steel and Stainless Steel Bolting Materials for High-Temperature Service
Specification &
Grade
Size Range
(in.)2 1/2 & under
ASTM A193 B7
Over 2 1/2 - 4Over 4 – 7 4 & underOver 4 - 72 1/2 & under
ASTM A193 B16
Over 2 1/2 - 4Over 4 - 8
Min. Tensile Strength
(psi)125,000115,000100,000100,000100,000125,000110,000100,000
Min. Yield Strength(psi)105,00095,00075,00080,00075,000105,00095,00085,000
Core Hardness Rockwell(max)C35C35C35B99B99C35C35C35
Similar to B7 except heat-treated to limit the maximum hardness. Considered in areas where stress embrittlement may be a factor.
Grade 2HM
A chromium-Molybdenum-Vanadium alloy used for high-pressure, high-temperature service applications. Offers slightly higher
temperature resistance than B7.Chromium-Molybdenum alloy (4140, 4142, 4145, 4140H, 4142H, 4145H) used for high-pressure, high-temperature applications.
Grade 2H
Description
Grade Identification Marking
Compatible ASTM A194 Heavy Hex Nut
ASTM A193
B7M
Grade 4
ASTM A193 B8
Class 1
1/4 & larger75,00030,000B96
A 304 Stainless Steel used for high temperature applications. This material has
been carbide solution treated.
Grade 8
A 316 Stainless Steel used for high temperature applications. This material has
been carbide solution treated.
Grade 8M
ASTM A193 B8M Class 1
1/4 & larger75,00030,000B96
Compatible denotes commercially available nut having suitable mechanical properties and dimensional configuration or style which will make it possible to obtain the desired bolt load. Higher strength nuts or nuts of equal strength may be a suitable substitute provided bolt standard allows.
Mechanical Properties of Common Stainless Steel Fasteners in Accordance with ASTM F593
Stainless Alloy Condition
Group
1
(304, 304L, 305, 384, 18-9LW, 302HQ)
3/4 - 1 1/2
CW
Nominal Dia.(in.)1/4 - 5/8
Tensile Strength (psi)100,000 -
150,000
Core Hardness Rockwell
Min.B95
Max.C32
Min. Yield Strength(psi)65,000
Grade Identification Marking
85,000 -
140,000
B80C3245,000
(316, 316L)
150,000
3/4 - 1 1/285,000 -
140,000
B80C3245,000