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Flange Bolting / INCONEL 718

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 17-4 PH Stainless Steel and INCONEL X-750 Alloy, 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




INCONEL 718 flange bolting is available at 30,000, 45,000, and 60,000 psi bolt stress.

The material for the part numbers shown is INCONEL 718 Alloy. Other materials available include the following.

• H13 Tool Steel
• 17-4 PH Stainless Steel
• 17-7 PH Stainless Steel
• INCONEL X-750 Alloy

Dimensions for other materials vary to achieve proper bolt stress.