30 sizes

Pipe (NPT / BSPT / BSPP) threads

Tap the size you need for its full dimensions, tap drill, clearance hole, torque estimate and wrench sizes.

NPT — American tapered pipe BSPT (R) — British tapered pipe BSPP (G) — British parallel pipe

12 sizes

NPT — American tapered pipe

1/16-27 NPTTap 6.35 mmØ 7.94 mm · pitch 0.941 mm 1/8-27 NPTTap 8.74 mmØ 10.29 mm · pitch 0.941 mm 1/4-18 NPTTap 11.11 mmØ 13.72 mm · pitch 1.411 mm 3/8-18 NPTTap 14.68 mmØ 17.15 mm · pitch 1.411 mm 1/2-14 NPTTap 17.86 mmØ 21.34 mm · pitch 1.814 mm 3/4-14 NPTTap 23.42 mmØ 26.67 mm · pitch 1.814 mm 1-11.5 NPTTap 29.36 mmØ 33.4 mm · pitch 2.209 mm 1-1/4-11.5 NPTTap 38.1 mmØ 42.16 mm · pitch 2.209 mm 1-1/2-11.5 NPTTap 44.05 mmØ 48.26 mm · pitch 2.209 mm 2-11.5 NPTTap 56.36 mmØ 60.33 mm · pitch 2.209 mm 2-1/2-8 NPTTap 67.06 mmØ 73.03 mm · pitch 3.175 mm 3-8 NPTTap 82.7 mmØ 88.9 mm · pitch 3.175 mm

9 sizes

BSPT (R) — British tapered pipe

1/8-28 BSPTTap 8.4 mmØ 9.728 mm · pitch 0.907 mm 1/4-19 BSPTTap 11.2 mmØ 13.157 mm · pitch 1.337 mm 3/8-19 BSPTTap 14.75 mmØ 16.662 mm · pitch 1.337 mm 1/2-14 BSPTTap 18.25 mmØ 20.955 mm · pitch 1.814 mm 3/4-14 BSPTTap 23.75 mmØ 26.441 mm · pitch 1.814 mm 1-11 BSPTTap 30 mmØ 33.249 mm · pitch 2.309 mm 1-1/4-11 BSPTTap 38.75 mmØ 41.91 mm · pitch 2.309 mm 1-1/2-11 BSPTTap 44.5 mmØ 47.803 mm · pitch 2.309 mm 2-11 BSPTTap 56.5 mmØ 59.614 mm · pitch 2.309 mm

9 sizes

BSPP (G) — British parallel pipe

1/8-28 BSPPTap —Ø 9.728 mm · pitch 0.907 mm 1/4-19 BSPPTap —Ø 13.157 mm · pitch 1.337 mm 3/8-19 BSPPTap —Ø 16.662 mm · pitch 1.337 mm 1/2-14 BSPPTap —Ø 20.955 mm · pitch 1.814 mm 3/4-14 BSPPTap —Ø 26.441 mm · pitch 1.814 mm 1-11 BSPPTap —Ø 33.249 mm · pitch 2.309 mm 1-1/4-11 BSPPTap —Ø 41.91 mm · pitch 2.309 mm 1-1/2-11 BSPPTap —Ø 47.803 mm · pitch 2.309 mm 2-11 BSPPTap —Ø 59.614 mm · pitch 2.309 mm