G 1 1/4 thread dimensions

Major diameter

41.910 mm1.6500 in

Pitch

2.309 mm11 TPI

Minor diameter

38.953 mmbasic profile, before tolerances

Thread height

1.479 mmbasic profile, before tolerances

Standard

ISO 228-1 (BSPP)

Form

Parallel

Flank angle

55°

Seals on

Gasket / O-ring

Used for

Process connections

Check a measurement against this thread

Schematic: flank angle and pitch-to-depth proportions to scale.

No other thread in the reference table has a pitch within 4 % and a diameter within 1.5 mm of this one.