ASTM A193 Grade B8TA 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 B8TA Raw Material
| Grade |
Raw Material Description |
| B8TA |
AISI 321 Stainless Steel, Carbide Solution Treated in Finished Condition |
ASTM A193 Grade B8TA Properties
ASTM A193 Grade B8TA 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 B8TA Mechanical Properties |
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
| B8TA |
All Diameters |
515 |
205 |
30 |
50 |
192 HBW or 90 HRB |
ASTM A193 Grade B8TA Bolt Marking
| Class |
Manufacture's Marking |
Grade Symbol |
| Class 1A |
BPF |
B8J or B8TA |
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |
| ASTM A193 Grade B8T, B8TA |
ASTM A194 Grade 8T, 8TA |
SS 321 |
ASTM A193 Grade B8TA Bolting