BSPP (G) - British parallel pipe
1/2-14 BSPP pipe thread: 14 TPI, major Ø 20.955 mm.
Profile
| Designation | 1/2-14 BSPP |
|---|---|
| Major (outside) diameter | 20.955 mm · 0.825" |
| Pitch | 1.814 mm · 14 TPI |
| Pitch diameter | 19.777 mm · 0.7786" |
| Minor diameter (external) | 18.729 mm · 0.7374" |
| Minor diameter (internal) | 18.991 mm · 0.7477" |
| Recommended tap drill | - |
Pipe threads are made up to a seal against the mating flanks, not tightened to a bolt preload, so no proof load or tightening-torque figure applies.
The bolt schedule collects the fasteners for one job onto a single sheet - tap drill, wrench size, grade and tightening torque on every line, taken straight from pages like this one. Free schedules hold 3 lines and are saved in this browser only.
1/2-14 BSPP is a BSPP pipe thread running at 14 threads per inch on a 20.955 mm major diameter. BSPP (G) is a parallel thread sealed by a bonded washer or gasket, not by thread interference - so it has no tapered tap-drill sizing.
All values are generated from the standard thread formulas (ISO 68-1 / ASME B1.1) and published standard tables - not hand-entered. See the full reference.
Drill - before tapping 1/2-14 BSPP. BSPP (G) is a parallel thread sealed by a bonded washer or gasket, not by thread interference - so it has no tapered tap-drill sizing.
1/2-14 BSPP is parallel. BSPP (G) threads do not seal on the thread itself; the joint seals on a bonded washer, gasket or O-ring at the face.
1/2-14 BSPP runs at 14 threads per inch, a pitch of 1.814 mm, on a major diameter of 20.955 mm.
No. Pipe threads are made up to a seal against the mating flanks, not tightened to a bolt preload, so no proof load or tightening-torque figure applies.
Same diameter
The pipe this thread runs on
NPS 1/2 pipe is 0.84 in across the outside whatever the schedule; at standard wall (std) the wall is 0.109 in and the bore 0.622 in.
Full dimensions for the standard wall · every schedule in the chart
Nearby sizes