Why there are two types of MSS SP43 Stub Ends with different radii?
MSS SP43 has two types of Stub Ends, namely A and B.
A is used with Lap Joint flanges, B is used with Slip On flanges
The Type A has its outside corner radiused to accommodate Lap Joint flanges. The inside corner is square.
The Type B has an outside corner radius small enough to accommodate Slip On flanges that are being used as the Backup Flange. The inside corner is square. Occasionally, if a Slip On type flange is used, chamfers on the I.D. face of the flange are required for a good joint.
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