ASTM A193 B8M Stud Bolt and A194 8M Hex Nuts
316 Stainless Steel Stud Bolting for Corrosive Environments
ASTM A193 B8M stud bolts with ASTM A194 Grade 8M hex nuts are austenitic stainless steel bolting assemblies manufactured from Type 316 stainless steel, offering excellent resistance to chloride corrosion, pitting, and chemical attack. This bolting combination is widely specified for flanged joints in corrosive, marine, and offshore environments
We are a professional manufacturer of A193 B8M Stud Bolt and A194 8M Hex Nuts in China
What Is ASTM A193 B8M?
ASTM A193 is the standard specification for alloy steel and stainless steel bolting materials used in high-pressure and high-temperature service.
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Grade B8M corresponds to Type 316 stainless steel
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Supplied in solution annealed condition
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Non-magnetic in the annealed state
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Superior corrosion resistance compared to B8 (Type 304)
ASTM A193 B8M stud bolts are suitable for both ambient and elevated temperature applications.
ASTM A193 is a standard that covers alloy steel and stainless steel threaded fasteners designed to meet the demands of high temperature and high pressure services.
B8M: This designation signifies that the material is stainless steel. Specifically, it indicates a type of stainless steel known as AISI 316 stainless steel.
AISI 316 stainless steel is a molybdenum-bearing austenitic stainless steel with improved corrosion resistance compared to AISI 304 stainless steel, especially in chloride environments. It contains chromium, nickel, and molybdenum, making it highly resistant to corrosion and oxidation.
What Is ASTM A194 Grade 8M?
ASTM A194 Grade 8M covers heavy hex nuts made from Type 316 stainless steel, designed to be used with ASTM A193 B8M stud bolts.
ASME B18.2.1 Stud Bolt &ASME B18.2.2 hex nuts
Stud Bolt & Nut Specification
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Stud Bolt Standard: ASTM A193 Grade B8M
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Hex Nut Standard: ASTM A194 Grade 8M
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Thread Standard: ASME B1.1 (UNC / UNF)
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Stud Dimensions: ASME B18.31.2
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Nut Dimensions: ASME B18.2.2
Size Range
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Diameter: 1/4″ – 4″
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Length: Custom cut to suit ASME B16.5 / B16.47 flange thickness and gasket type
Type: Stud Bolts and Nuts.
Material: A193 B8M Stud Bolt and A194 8M Hex Nuts
A193 B8M Hex Bolt and A194 8M Hex Nuts
Standard: ASME B18.2.1, ASME B18.2.2.
Chemical Composition – B8M 316 Stainless Steel (Typical, wt %)
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties
ASTM A193 B8M Stud Bolts
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Tensile Strength: ≥ 515 MPa
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Yield Strength (0.2%): ≥ 205 MPa
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Elongation: ≥ 30%
ASTM A194 8M Hex Nuts
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Mechanical properties matched to B8M bolting
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Class 2 nuts provide higher strength via cold working
Heat Treatment
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B8M Stud Bolts: Solution annealed
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8M Nuts:
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Class 1: Solution annealed
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Class 2: Strain hardened
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Testing & Inspection
ASTM A193 B8M stud bolts and A194 8M hex nuts are supplied with:
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Chemical analysis
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Tensile testing
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Hardness testing
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Dimensional inspection
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Visual inspection
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Optional NDT (UT / PT)
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Certification: EN 10204 3.1 / 3.2 (upon request)
ASTM A193 B8M stud bolts with ASTM A194 8M hex nuts provide a durable and corrosion-resistant fastening solution for high-pressure flange connections in aggressive environments. With full compliance to ASTM and ASME standards and excellent performance in offshore and chemical service, B8M/8M stainless steel bolting is a reliable choice for critical applications.
How to order our ASTM A193 B8M Stud Bolts?
EXAMPLE#1,
STUD BOLT , 3/4 X 145 LG ,W/2 HVY HEX NUT; (IMP SIZE X METRIC LG); SS ASTM A193 GR A193 B8M CL 2/ASTM A194 GR 8MA
Quantity: 120 Each
