ASTM A193 Grade B8NA Bolts, Stud Bolts, Fasteners
Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
ASTM A193 specification covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B6, B7, B8, B8M, etc.
Selection will depend upon design, service conditions, mechanical properties, and high temperature characteristics. This specification is expressed in both inch-pound units
and in SI units; however, unless the purchase order or contract specifies the applicable A193M specification designation (SI units), the inch-pound units shall apply
ASTM A193 Grade B8N Raw Material
| Grade |
Raw Material Description |
| B8N |
AISI 304N Stainless Steel, Carbide Solution Treated |
| B8N |
AISI 304N Stainless Steel, Carbide Solution Treated and Strain Hardened |
ASTM A193 Grade B8N Properties
ASTM A193 Grade B6 Chemical Composition |
| Carbon |
Manganese, max |
Phosphorus, max |
Sulfur, max |
Silicon |
Chromium |
Molybdenum |
| 0.10 min |
1.00 |
0.040 |
0.030 |
1.00 max |
4.00 - 6.00 |
0.40 - 0.65 |
ASTM A193 Grade B6 Mechanical Properties |
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
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ASTM A193 Grade B8N Bolt Marking
| Class |
Manufacture's Marking |
Grade Symbol |
| Class 1B |
BPF |
B8N |
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |
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ASTM A193 Grade B8N Bolting