ASTM A193 Grade B8M Class 1 Specification

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ASTM A193 Grade B8M Class 1 Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 316 stainless steel. ASTM A193 Grade B8M Class 1 is a standard material specification for corrosion resistant 316 stainless steel fasteners such as bolts, screws, studs, threaded rods and other externally threaded parts, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8M Class is a carbide solution treated 316 stainless steel having a minimum tensile requirement of 75 ksi, yield 30 ksi and maximum hardness requirement of 223 HBW or 96 HRB. This specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8M Class 1 Fasteners.


Chemical Composition

Element Austenitic Stainless Steel
AISI 316 / 316L
CompositionA, %
Carbon 0.08 max
Manganese 2.00
Phosphorus 0.045 max
Sulfur 0.030 max
Silicon 1.00 max
Chromium 16.00 - 18.00
Nickel 10.00 - 14.00
Molybdenum 2.00 - 3.00

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


Mechanical Properties

Tensile Class Diameter, Inch
min, ksi		 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 8M ASTM A240 TP316

Fasteners

Commonly Produced B8M 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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