BSPT (R) - British tapered pipe
1-11 BSPT pipe thread: 11 TPI, major Ø 33.249 mm.
Profile
| Designation | 1-11 BSPT |
|---|---|
| Major (outside) diameter | 33.249 mm · 1.309" |
| Pitch | 2.309 mm · 11 TPI |
| Pitch diameter | 31.749 mm · 1.25" |
| Minor diameter (external) | 30.416 mm · 1.1975" |
| Minor diameter (internal) | 30.749 mm · 1.2106" |
| Recommended tap drill | 30 mm |
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.
1-11 BSPT is a BSPT pipe thread running at 11 threads per inch on a 33.249 mm major diameter. BSPT (R) is a 55° Whitworth tapered thread that seals on the flanks.
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 30 mm before tapping 1-11 BSPT. BSPT (R) is a 55° Whitworth tapered thread that seals on the flanks.
1-11 BSPT is tapered. BSPT (R) is a 55° Whitworth tapered thread that seals as the flanks wedge together, normally with thread sealant or PTFE tape.
1-11 BSPT runs at 11 threads per inch, a pitch of 2.309 mm, on a major diameter of 33.249 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 pipe is 1.315 in across the outside whatever the schedule; at standard wall (std) the wall is 0.133 in and the bore 1.049 in.
Full dimensions for the standard wall · every schedule in the chart
Nearby sizes