ASME B16.9 · MSS SP-43
Buttweld Fittings
Buttweld fittings are welded to the pipe with a full-penetration butt weld. They suit ½" and larger lines, give a smooth bore and can be radiographed.
- ASME B16.9
- NPS ½" – 48"
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Buttweld Fittings types
ElbowA fitting that changes the direction of a pipe run.TeeA fitting with a 90° branch that splits or combines flow.ReducerA fitting that joins two pipes of different sizes.CapA fitting that closes the end of a pipe.Stub endA short pipe length with a flared lap that works with a lap joint flange.CrossA four-way fitting with branches at 90°.BendA pipe bend with a larger radius than a standard elbow.LateralA fitting with a 45° branch.
Buttweld Fittings by grade
Buttweld Fittings — questions buyers ask
What sizes are buttweld fittings made in?
NPS ½" – 48", schedules 5S – XXS to match the pipe.
Which standard covers buttweld fittings?
ASME B16.9 · MSS SP-43 for dimensions; the material standard depends on the grade — for example ASTM A403 for stainless, A815 for duplex and B366 for nickel alloys.
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