ASTM A193 Grade B8R 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 B8R Raw Material

Grade Raw Material Description
B8R Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated

ASTM A193 Grade B8R Properties

ASTM A193 Grade B8R Chemical Composition

Carbon, max Manganese Phosphorus, max Sulfur, max Silicon Chromium Molybdenum
0.10 min 4.00-6.00 0.040 0.030 1.00 max 4.00-6.00 0.40-0.65

ASTM A193 Grade B8R Mechanical Properties

Grade Diameter Tensile Strength Yield Strength Elongation Reduction Hardness
Grade B8R, Class 1C, 1D All Diameters 690 380 35 55 271 HBW or 28 HRC

ASTM A193 Grade B8R Bolt Marking

Class Manufacture's Mark Grade Symbol
Class 1C BPF B9A or B8R
Class 1D BPF B101

Recommended Nuts & Washers

Bolting Grade Nut Grade Washer Grade
ASTM A193 Grade B8R ASTM A194 Grade 8R Nitronic 50/UNS S20910

ASTM A193 Grade B8R 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