Xem Studiomeasured geometry

Library › Tri-clamp & pipe › ASME B16.5 Class 300 pipe flanges, NPS ½ to 24: dimensions, bolt…

Slip-on flange, NPS 1-1/4 Class 300

Slip-on flange, NPS 1-1/4 Class 300: OD 133.3 mm, raised face dia 63.5 x 1.6 mm, bolt circle 98.4 mm, 4 holes dia 19.0 mm for 0.625 in bolts; bore 43.2 mm, hub dia 63.5 mm drawn straight, length 25.4 mm from the raised face to the hub end

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

NPS1-1/4
flange OD, in (mm)5.25 (133.3)
thickness incl. raised face, in (mm)0.75 (19.0)
raised-face dia, in (mm)2.50 (63.5)
bolt circle, in (mm)3.88 (98.4)
holes × hole dia, in4 × 0.75
bolt dia, in0.625
hub dia at base, in (mm)2.50 (63.5)
slip-on hub length, in1.00
weld-neck length, in2.50
slip-on bore, in1.70
weld-neck end OD, in1.66
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

From the full sheet

ASME B16.5 Class 300 pipe flanges, NPS ½ to 24: dimensions, bolt circle, slip-on and blind: every size, notes, mating features and sources. What are the dimensions of an ASME B16.5 Class 300 flange (OD, thickness, raised face, bolt circle, bolt holes)?

Other sizes