ASTM A193 Grade B8 Class 1 Specification

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ASTM A193 Grade B8 Class 1 Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other fasteners, made from carbide solution treated 304 stainless steel. ASTM A193 Grade B8 Class 1 is a standard material specification for corrosion resistant austenitic stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8 Class 1 is a carbide-solution-treated 304 stainless steel with minimum tensile requirement of 75 ksi, yield 30 ksi and maximum hardness of 96 HRB. This specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8 Class 1 Fasteners.


Chemical Composition

Element Austenitic Stainless Steel
AISI 304 / 304L
CompositionA, %
Carbon 0.08 max
Manganese 2.00
Phosphorus 0.045 max
Sulfur 0.030 max
Silicon 1.00 max
Chromium 18.00 - 20.00
Nickel 8.00 - 11.00

AThe intentional addition of Bi, Se, Te, and Pb is not permitted.


Mechanical Properties

Tensile Class Diameter, Inch Tensile Strength,
min, ksi
Yield Strength,
min, 0.2% offset,
ksi
Elongation
in 4D,
min, %
Reduction
of Area,
min, %
Hardness,
max
Class 1 All Sizes 75 30 30 50 223 HBW or 96 HRB

Heat Treatment: Carbide Solution Treated


Recommended Nuts & Washers

Nut Specification Washer Specification
ASTM A194 Grade 8 ASTM A240 TP304

Fasteners

Commonly Produced B8 Class 1 Fasteners
Hex Bolts Heavy Hex Bolts Stud Bolts Threaded Rods Anchor Bolts
Eye Bolts Socket Head Cap Screws Countersunk Screws U Bolts Square Head Bolts
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