ASTM A193 Grade B8T 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 B8T Raw Material

Grade Tensile Class Raw Material Description
B8T Class 1 AISI 321 Stainless Steel, Carbide Solution Treated
B8T Class 2 AISI 321 Stainless Steel, Carbide Solution Treated and Strain Hardened

ASTM A193 Grade B8T Properties

ASTM A193 Grade B8T 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 B8T Mechanical Properties

Grade Diameter Tensile Strength Yield Strength Elongation Reduction Hardness
Grade B8T, Class 2 M20 and under 860 690 12 35 321 HBW or 35 HRC
Grade B8T, Class 2 M20 to M24, inclusive 690 550 20 45 321 HBW or 35 HRC
Grade B8T, Class 2 M24 to M30, inclusive 655 450 25 45 321 HBW or 35 HRC
Grade B8T, Class 2 M30 to M36, inclusive 620 345 30 45 321 HBW or 35 HRC
Grade B8T, Class 1 All Diameters 515 205 30 50 192 HVW or 90 HRB

ASTM A193 Grade B8T Bolt Marking

Class Grade Grade Symbol
Class 1 B8T B8T
Class 2 B8T B8TSH

Recommended Nuts & Washers

Bolting Grade Nut Grade Washer Grade
ASTM A193 Grade B8T ASTM A194 Grade 8T SS 321

ASTM A193 Grade B8T Bolting

Hex Bolt Heavy Hex Bolts Stud Bolts Threaded Rods Anchor Bolts
Eye Bolts Socket Head Cap Screws Countersunk Screws J Bolts Square Head Bolts