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Flange Bolting / H13

Help eliminate flange leakage with BelleFlex™ flange bolting.  Leaks occur by bolt stretch, gasket creep, cycles of thermal change, etc. However, by maintaining load on bolted joints, leakage is greatly reduced, if not eliminated. H13 Tool Steel is the main material for this product group, with a working temperature to 1000°F. Materials, such as 17-7 PH Stainless Steel and INCONEL 718 and X-750 Alloys, are also available.

(1) Torque values for sizes 1-1/8" and larger are based on the
8-pitch thread series for flanged piping.
(2) 50,000 psi bolt stress
(3) 45,000 psi bolt stress

H13 flange bolting is available at 30,000, 45,000, and 60,000 psi bolt stress.

The material for the part numbers shown is H13 Tool Steel. Other materials available include the following.

• 17-4 PH Stainless Steel
• 17-7 PH Stainless Steel
• INCONEL 718 Alloy
• INCONEL X-750 Alloy

Dimensions for other materials vary to achieve proper bolt stress.