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Flange Bolting / Cryogenic 17-7 PH

With large temperature differences seen in cryogenic applications, the use of Belleville disc springs can play a significant role in the reduction of leaks. Materials with good cryogenic properties are PH (precipitation hardening) and Carpenter Technology stainless steels.

(1) Torque values for sizes 1-1/8" and larger are based on the
8-pitch thread series for flanged piping.



Cryogenic 17-7 PH flange bolting is available at 15,000 and 25,000 psi bolt stress.

The material for the part numbers shown is 17-7 PH Stainless Steel. Other materials available include the following.

• 17-4 PH Stainless Steel
• Carpenter Custom 455
  Stainless Steel

Dimensions for other materials vary to achieve proper bolt stress.