B8M Class 2 All Thread Rod
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B8M Class 2 All Thread Rod

ASTM A193/A320 Grade B8M all thread rod is dual certified. The A193 specification covers fasteners that are intended for high temperature and high pressure applications, while A320 covers low temperature applications. Both grades are made from AISI 316 stainless steel and tested to meet requirements per ASTM A193/A320. Dimensional specifications are governed by ASME B18.31.3. A193/A320 B8M all thread rod having diameters above 1" are most common 8UN (8 threads per inch). Non-magnetic, 316 stainless has good corrosion resistance. For use in pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.

Governing StandardsGrade B8M Class 2 Stainless Steel

ASTM A193 Covers alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASME B18.31.3 Covers the general and dimensional data for inch series threaded rods.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
ASTM A320 Covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service.
ASME B18.31.3 Covers the general and dimensional data for inch series threaded rods.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Mechanical PropertiesGrade B8M Class 2 Stainless Steel

AISI 316 Stainless Steel, Carbide Solution Treated, Strain Hardened Per ASTM A193/A193M-16
Material Tensile
Strength
Yield Strength,
0.2% offset
Elongation
in 4D
Reduction
of Area
Hardness
Min ksi Min ksi Min % Min % Max
316 Stainless Steel 110 95 15 45 321 HBW or 35 HRC
AISI 316 Stainless Steel, Carbide Solution Treated, Strain Hardened Per ASTM A320/A320M-15a
Diameter Tensile
Strength
Yield Strength,
0.2% offset
Elongation in
2 in. or 50 mm
Reduction
of Area
Hardness
Min ksi Min ksi Min % Min % Max
3/4" and under 110 95 15 45 321 HBW or 35 HRC
over 3/4 to 1", incl 100 80 20 45 321 HBW or 35 HRC
over 1 to 1 1/4", incl 95 65 25 45 321 HBW or 35 HRC
over 1 1/4 to 1 1/2", incl (1) 90 50 30 45 321 HBW or 35 HRC
  1. 1. These upper diameter limits were established on the basis that these were the largest sizes commonly available that consistently met specification property limits. They are not intended as absolute limits beyond which bolting materials could no longer be certified to the specification.

Chemical PropertiesGrade B8M Class 2 Stainless Steel

Per ASTM A193/A193M-16
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum
% by weight % by weight % by weight % by weight % by weight % by weight % by weight % by weight
B8M 316 Stainless Steel 0.08 max 2.00 max 0.045 max 0.030 max 1.00 max 16.0-18.0 10.0-14.0 2.00-3.00
Per ASTM 320/A320M-15a
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum
% by weight % by weight % by weight % by weight % by weight % by weight % by weight % by weight
B8M 316 Stainless Steel 0.08 max 2.00 max 0.045 max 0.030 max 1.00 max 16.0-18.0 10.0-14.0 2.00-3.00
B8M Class 2 All Thread Rod
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Diameter Thread Pitch Length Item # Availability Price Quantity UOM
1/2 13 12 FT R8M20500000 In Stock $7.75431/FT FT
5/8 11 12 FT R8M20620000 In Stock $10.67539/FT FT
3/4 10 12 FT R8M20750000 In Stock $15.59112/FT FT
7/8 9 12 FT R8M20870000 In Stock $25.25561/FT FT
1 8 12 FT R8M21000000 In Stock $30.68872/FT FT
1 1/8 8 12 FT R8M21120000 In Stock $38.22646/FT FT
1 1/4 8 12 FT R8M21250000 In Stock $44.15596/FT FT
1 1/2 8 12 FT R8M21500000 In Stock $68.14261/FT FT