B8 Class 2 All Thread Rod
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B8 Class 2 All Thread Rod

ASTM A193/A320 Grade B8 all thread rod is dual certified. The A193 specification covers fasteners intended for high temperature and high pressure applications, while A320 covers low temperature applications. Both grades are made from AISI 304 stainless steel and are tested to meet ASTM A193/A320. Dimensional specifications are governed by ASME B18.31.3. A193/A320 B8 all thread rod having diameters above 1" are most common 8UN (8 threads per inch). Non-magnetic, 304 stainless has good corrosion resistance. For use in pressure vessels, valves, flanges, or other special purpose applications.

Governing StandardsGrade B8 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 B8 Class 2 Stainless Steel

AISI 304 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
304 Stainless Steel 125 100 12 35 321 HBW or 35 HRC
AISI 304 Stainless Steel, Carbide Solution Treated, Strain Hardened Per ASTM A320/A320M-15a
Material Tensile
Strength
Yield Strength,
0.2% offset
Elongation in
2 in. or 50 mm
Reduction
of Area
Hardness
304 Stainless Steel Min ksi Min ksi Min % Min % Max
3/4" and under 125 100 12 35 321 HBW or 35 HRC
over 3/4 to 1", incl 115 80 15 30 321 HBW or 35 HRC
over 1 to 1 1/4", incl 105 65 20 35 321 HBW or 35 HRC
over 1 1/4 to 1 1/2", incl (1) 100 50 28 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 B8 Class 2 Stainless Steel

Per ASTM A193/A193M-16
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel
% by weight % by weight % by weight % by weight % by weight % by weight % by weight
B8 304 Stainless Steel 0.08 max 2.00 max 0.045 max 0.030 max 1.00 max 18.0-20.0 8.0-11.0
Per ASTM 320/A320M-15a
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel
% by weight % by weight % by weight % by weight % by weight % by weight % by weight
B8 304 Stainless Steel 0.08 max 2.00 max 0.045 max 0.030 max 1.00 max 18.0-20.0 8.0-11.0
B8 Class 2 All Thread Rod
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Diameter Thread Pitch Length Item # Availability Price Quantity UOM
1/2 13 12 FT RB820500000 In Stock $6.80233/FT FT
5/8 11 12 FT RB820620000 In Stock $11.07937/FT FT
3/4 10 12 FT RB820750000 5-7 Working Days ARO $14.20024/FT FT
7/8 9 12 FT RB820870000 In Stock $16.91833/FT FT
1 8 12 FT RB821000000 In Stock $25.72115/FT FT
1 1/8 8 12 FT RB821120000 In Stock $37.65283/FT FT
1 1/4 8 12 FT RB821250000 In Stock $38.97405/FT FT
1 3/8 8 12 FT RB821370000 In Stock $45.311/FT FT
1 1/2 8 12 FT RB821500000 In Stock $76.66787/FT FT