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This type of flanges are preferred to welding neck flanges by many users on account of their initially lower cost, the reduced accuracy required in cutting the pipe to length, and the somewhat greater ease of alignment of the assembly.
The strength will be calculated under internal pressure is approximately two-thirds that of welding neck flanges, and their life under fatigue is about one-third that of the latter.

1/2" ~ 24"

Classes are:
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500