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Connection Bolting Information

ALLOY STEEL STUD BOLTING MATERIALS

The following grades of heat treated alloy steel studs are commonly used for high-pressure or extreme service in diameters of ¼ in. to 4 in., inclusive. Other grades and other diameters are available on special order.

ASTM 193, Grade B7
Heat treated chromium-molybdenum steel recommended for medium high temperature service. (Liquid quench -50º to 900º F, Air quench -40º to 900º F)

ASTM A193, Grade B7M
Similar to B7 studs except that the minimum yield and tensile strength requirements are reduced and the hardness controlled to 235 Brinell maximum. Recommended for use in corrosive environments. (-50º to 900º F)

ASTM A193, Grade B16
A heat treated chromium-molybdenum-vanadium steel recommended for high pressure, high temperature service. (-50º to 1100º F)

ASTM A320, Grade L7
This grade is intended for low temperature service down to minus 150º F and has a minimum Charpy impact value of 20 ft. lbs. at this temperature. (-50º to 1100º F)

ASTM A320, Grade L7M
Similar to L7 studs except that the minimum yield and tensile strength requirements are reduced and the hardness controlled to 235 Brinell maximum. This stud is recommended for use in low temperature corrosive environments. (-50º to 1100º F)

ASTM A320, Grade L43
This grade is intended for low temperature service down to minus 150º F and has a minimum Charpy impact value of 20 ft. lbs. at this temperature. Available in sizes up to a 4 inch diameter. (-150º to 1100º F)

ASTM A193, Grade B8
These Chromium-Nickel (AISI 304) austenitic steel studs are recommended for use in corrosive environments.
(-325º to 1500º F)

ASTM A193, Grade B8M
These chromium-nickel molybdenum (AISI 316) austenitic steel studs are recommended for use in corrosive environments. (-325º to 1500º F)

CARBON AND ALLOY STEEL NUTS

ASTM A194, Latest Revision, Grade 2H
Suitable for use in high temperatures and high pressure conditions.

ASTM A194, Grade 2HM
Similar to 2H nuts except this grade is recommended for use in corrosive environments.

ASTM A194, Latest Revision, Grade 4
Heat treated molybdenum steel nuts suitable for severe temperature and pressure conditions.

ASTM A194, Latest Revision, Grade L7
New stamping as per ASTM is 7L. Heat treated chrome-molybdenum steel nuts suitable for extreme temperature and pressure conditions. Suitable for sub-zero service conditions and have minimum Charpy impact values in accordance with ASTM specifications. A320, Grade 7 down to -150º F.

ASTM A194, Grade L7M
New stamping as per ASTM is 7ML. Similar to grade L7 nuts except this grade is recommended for use in corrosive environments.

ASTM A194, Grade 8/8M
Stainless steel nuts recommended for use in corrosive environments.

 

NOTES

  1. Connection stud bolting can be furnished by FCI upon request.
  2. All data per ASME B16.5 – 1996

 

NOTE:
Technical data contained in this section governed by ASME or other Codes/Specifications are subject to change and are therefore provided for information purposes only and are not to be used for design purposes. Refer to latest edition of applicable Code/Specification and addendums thereto for required design data.