ASTM A193

Standard specification for bolting high-temperature, high-pressure or other special purpose applications using alloy or stainless steel bolting. Applications include pressure vessels, valves, flanges, and fittings. For grades and general requirements (including, but not limited to: B5 and B8) see ASTM A962/A962M.


ASTM A193
GRADES
B7 Alloy steel, AISI 4140/4142 quenched and tempered
B8 Class 1 Stainless steel, AISI 304, carbide solution treated
B8M Class 1 Stainless steel, AISI 316, carbide solution treated
B8 Class 1 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M Class 1 Stainless steel, AISI 316, carbide solution treated, strain hardened
Mechanical Properties
Grade Size Tensile ksi, min Yield, ksi, min Elong, %, min RA % min
B7 up to 2-1/2 125 105 16 50
  2-5/8 - 4 115 95 16 50
  4-1/8 - 7 100 75 18 50
B8 Class 1 All 75 30 30 50
B8m Class 1 All 75 30 30 50
B8 Class 2 Up to 3/4 125 100 12 30
  7/8 - 1 115 80 15 30
  1-1/8 - 1-1/4 105 65 20 30
  1-3/8 - 1-1/2 100 50 28 45
B8m Class 2 Up to 3/4 110 95 15 45
  7/8 - 1 100 80 20 45
  1-1/8 - 1-1/4 95 65 25 45
  1-3/8 - 1-1/2 90 50 30 45
Recommended Nuts and Washers
Bolt grade Nuts Washers
B7 A194 Grade2H F436
B8 A194 Grade 8 SS304
B8M A194 Grade 8m SS316
B8 A194 Grade 8 SS304
B8M A194 Grade 8M SS316
Strain hardened nuts available as a supplementary requirement