ASTM A193 Grade B8CA 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 B8CA Raw Material
| Grade |
Raw Material Description |
| B8CA |
AISI 347 Stainless Steel, Carbide Solution Treated in Finished Condition |
ASTM A193 Grade B8CA Properties
ASTM A193 Grade B8CA Chemical Composition |
| Carbon, max |
Manganese, max |
Phosphorus, max |
Sulfur, max |
Silicon |
Chromium |
Molybdenum |
Columnium + Tantalum |
| 0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
17.0 - 19.0 |
-- |
10 x carbon content, min – 1.10 max |
ASTM A193 Grade B8CA Mechanical Properties |
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
| Grade B8CA |
All Diameters |
515 |
205 |
30 |
50 |
192 HBW or 90 HRB |
ASTM A193 Grade B8CA Bolt Marking
| Class |
Manufacturer's Mark |
Grade Symbol |
| Class 1A |
BPF |
B8B or B8CA |
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |
| ASTM A193 Grade B8CA |
ASTM A194 Grade 8CA |
SS 347 |
ASTM A193 Grade B8CA Bolting