ASTM A193 Grade B8M2 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 B8M2 Raw Material
| Grade |
Raw Material Description |
| B8M2 |
AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
ASTM A193 Grade B8M2 Properties
ASTM A193 Grade B8M2 Chemical Composition |
| Carbon, max |
Manganese, max |
Phosphorus, max |
Sulfur, max |
Silicon, max |
Chromium |
Molybdenum |
| 0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
16.0-18.0 |
2.0-3.0 |
ASTM A193 Grade B8M2 Mechanical Properties |
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
| Grade B8M2 |
M48 and under |
655 |
515 |
25 |
40 |
321 HBW or 35 HRC |
| Grade B8M2 |
M48 to M64, inclusive |
620 |
450 |
30 |
40 |
321 HBW or 35 HRC |
| Grade B8M2 |
M64 to M72, inclusive |
550 |
380 |
30 |
40 |
321 HBW or 35 HRC |
ASTM A193 Grade B8M2 Bolt Marking
| Class |
Manufacturer's Mark |
Grade Symbol |
| Class 2B |
BPF |
B9G or B8M2 |
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |
| ASTM A193 Grade B8M2 |
ASTM A194 Grade 8M, 8MA |
SS 316 |
ASTM A193 Grade B8M2 Bolting