How to use
Choose a size to view outside diameter, bolt circle, hole count and hole diameter in mm.
Example calculation
NPS 2 · Class 150 → D = 152.4 mm; PCD = 120.65 mm; 4 × Ø19.05 mm
Calculation method
Results use the stated subset of the sources below. Numerical conversions and limits are explicit.
mm = in × 25.4
Calculation limits
Connection dimensions only. The source rounds inches to two decimals; converted mm values are not fabrication drawings. Flange type, hub, bore and thickness are outside scope. Class 150 does not mean 150 bar.