NPS 5 Pipe

Outside diameter 5.563″

OD in mm 141.3 mm

Every NPS 5 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	0.258″	6.553	5.047″	128.194
80 = XS	0.375″	9.525	4.813″	122.25

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.