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This flange initially developed for use on small size high pressure piping. When provided with an internal weld, their static strength is equal to, but their fatigue strength 50% greater than double welding slip-on flanges. This flange is very similar to Slip-On flange, the main difference is the bored out match a specific pipe inside-diameter.

1/2" ~ 24"

Available classes are:
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500