Reducer Dimensions

ASME B16.9 — butt-weld concentric and eccentric reducers, NPS 1/2 through 24. Same overall length H for both types. Eccentric offset e = (large OD − small OD) / 2.

Reducer Type

Large End (NPS)

Small End (NPS)

Select large and small end sizes to see dimensions

All dimensions in mm. H = overall length, governed by the large end. e = centerline offset between large and small ends (eccentric type). Per ASME B16.9, reducers NPS 20 and larger use H = 508 mm.