ASTM A193 Grade B8 CL2 STUD BOLTS
We are the professional manufacturer of ASTM A193 B8 CL2 STUD BOLTS in China
ASTM A193 Grade B8 Class 2 Stud bolt is a carbide solution treated and strain hardened 304 stainless steel bolting material specification, with higher tensile strength requirement of 125 ksi or 860 MPa and 100 ksi or 690 MPa and maximum hardness of 321 HBW or 35HRC.
ASTM A193 B8 Class 2 stud bolts are commonly used in marine and other heavy industrial environments that require corrosion resistant fasteners to be used
The A193 Grade B8 CL 2 stud bolt is widely utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high-pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
ASTM A193 Stainless threaded rod / stud bolt grades
| B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
| B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
| B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
| B8M | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
2.ASTM A193 Stainless threaded rod / stud bolt chemical composition:
| Element | B8 (AISI 304) | B8M (AISI 316) |
| Carbon | 0.08% max | 0.08% max |
| Manganese | 2.00% max | 2.00% max |
| Phosphorus, max | 0.05% | 0.05% |
| Sulfur, max | 0.03% | 0.03% |
| Silicon | 1.00% max | 1.00% max |
| Chromium | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel | 8.0 – 11.0% | 10.0 – 14.0% |
| Molybdenum | 2.00 – 3.00% |
3. Specifications of ASTM A193 Grade B8 Class 2 Stud Bolts
| Specification | Details |
|---|---|
| Material Grade | ASTM A193 Grade B8 Class 2 |
| Material Type | Austenitic Stainless Steel (AISI 304) |
| Tensile Strength (min) | 860 MPa (125 ksi) |
| Yield Strength (min) | 725 MPa (105 ksi) |
| Elongation (min) | 20% |
| Hardness (max) | 321 HBW or 35 HRC |
| Operating Temperature | Up to 750°F (400°C) |
| Thread Type | UNC, UNF, or metric |
| Corrosion Resistance | Excellent in general environments |
| Standards Compliance | ASTM A193/A193M |
Coating and Surface Treatments
PTFE Coating:
Applications of ASTM A193 Grade B8 Class 2 Stud Bolts
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Petrochemical Industry:
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Chemical Processing:
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Power Generation,
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Oil and Gas:
How to order our ASTM A193 GRADE 8 Class 2 Stud bolts？
STUD BOLTS ASTM A193 GRD B8 CLASS 2
02 HEAVY HEX NUT ASTM A194 GRD 8
02 FLAT WASHER ASME B18.21.1, Type A, Narrow SS316
1 1/4“ UNC* 220mm，Quantity ：120 sets
ASTM A193 Grade B8 Class 2 stud bolts are made from austenitic stainless steel (AISI 304) and are specially treated to achieve enhanced mechanical properties. Class 2 indicates that the bolts are strain-hardened, which increases their strength compared to Class 1. These bolts are widely used in applications requiring excellent corrosion resistance, moderate strength, and reliability under varying environmental conditions.
