ASTM A193 Grade B7M 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 B7M Raw Material

Grade Raw Material Description
B7M Chromium Molybdenum Alloy Steel, Quenched & Tempered

ASTM A193 Grade B7M Properties

ASTM A193 Grade B7M Chemical Composition

Carbon Manganese, max Phosphorus, max Sulfur, max Silicon Chromium Molybdenum
0.37 - 0.49 0.65 - 1.10 0.035 0.040 0.15-0.35 0.75-1.20 0.15-0.25

ASTM A193 Grade B7M Mechanical Properties

Grade Diameter Tensile Strength Yield Strength Elongation Reduction Hardness
Grade B7M M100 and under 690 550 18 50 235 HBW or 99 HRB
Grade B7M M100 and over 690 515 18 50 235 HBW or 99 HRB

Heat Treatment

Quenched & Tempered at 620ยบ C minimum.

ASTM A193 Grade B7M Bolt Marking

Manufacturer's Mark Grade Marking

Recommended Nuts & Washers

Bolting Grade Nut Grade Washer Grade
ASTM A193 Grade 7M ASTM A194 Grade 2H, 2HM ASTM F436

ASTM A193 Grade B7M 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