The stub ends are usually used with lap joint flanges, both of stub and lap joint flange can be purchased from EATHU. This flanged joint is an inexpensive flanged joint method suitable for low pressure and non-critical applications. Since the flange does not come into direct contact with the pipe, carbon steel short joints can be used to reduce the total weight and cost.

ASME B16.9: Lap Joint Stub Ends Wrought Steel Buttwelding Fittings (ASME)

Dimensions of ASME B16.9 MSS SP-43

Dimensions of ASME B16.9 MSS SP-43

*All dimensions are in mm unit(inch unit data sheet is also available upon request).

*Check the tolerances and materials for butt welding pipe fittings from "Price List and Techinical"

*Tolerances of dimensions are in conformance with ASME B16.9

Question: I want to know the difference between Stub End Type A and Type B, which one is more suitable for me? 

Eathu answer: Stub End has three different types – Type A, Type B, Type C, they are classified by the different “R” – the lap corner. But in actual working, “type A” is the common type as it is matching with lap joint flange specially.

Type A: To match standard lap joint flange, it is the default type if the client didn’t indicate the type specifically.

Type B: Stub End B type is mainly used for slip-on flanges and backing flanges, its lap angle is different from “type A”.

Type C: It can be used either with lap joint flange or slip-on flange. But it is not common type, most of eathu customers need “Type A” or “Type B” stub end.

Butt welding pipe fittings standard: 

ASME B16.49-2007 Factory-Made,Wrought Steel, Buttwelding Induction Bends for Transportation and 

ASME-B16.9-2007 Factory-Made Wrought Butt Welding Fitting

DIN2617-1991 Steel butt-welding pipe fittings

JIS G3452 SGP 1997  Steel Butt-welding pipe fittings for ordinary use

Weight for butt welding pipe fitting

Tolerances for ASME DIN JIS MSS Butt Welding Pipe Fittings

Wall Thickness Schedules (ASME B36.10 B36.19)

FLUIDO BUTT-WELDING FITTING TYPES