NPS 8 Pipe

Outside diameter 8.625″

OD in mm 219.075 mm

Every NPS 8 pipe has this OD regardless of schedule — the schedule changes only the wall thickness and bore.

Schedules

Schedule	Wall	Wall mm	Inside diameter	ID mm
40 = STD	0.322″	8.179	7.981″	202.717
80 = XS	0.500″	12.7	7.625″	193.675

Data provenance. ASME B36.10M, Welded and Seamless Wrought Steel Pipe (Table 2.1) (ASME). ID is derived: OD − 2 × wall. Dimensions are nominal; actual walls carry the standard's mill tolerance. See all data sources.