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Sizes · Pipe (NPT / BSPT / BSPP)

NPT — American tapered pipe

1/16-27 NPT

1/16-27 NPT pipe thread: 27 TPI, major Ø 7.94 mm.

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Tap drill
6.35 mm
7.94 mm major Ø

Profile

Thread form & key diameters

Major Ø 7.94 mmP 0.941 mm60°Root Ø 6.786 mm · Pitch Ø 7.329 mm1/16-27 NPT27 TPI · 60° form

Dimensions

Designation1/16-27 NPT
Major (outside) diameter7.94 mm · 0.3126"
Pitch0.941 mm · 27 TPI
Pitch diameter7.329 mm · 0.2885"
Minor diameter (external)6.786 mm · 0.2672"
Minor diameter (internal)6.922 mm · 0.2725"
Recommended tap drill6.35 mm

What tap drill do I need for 1/16-27 NPT?

1/16-27 NPT is a NPT pipe thread running at 27 threads per inch on a 7.94 mm major diameter. NPT is a 60° tapered thread that seals on the flanks; use a tapered reamer after drilling for a full-form thread.

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.

Same diameter

Other 1/16" NPT threads

5/16-32 UNEFTap 9/32"Ø 7.938 mm · pitch 0.794 mm5/16-24 UNFTap IØ 7.938 mm · pitch 1.058 mm5/16-18 UNCTap FØ 7.938 mm · pitch 1.411 mm

Nearby sizes

More npt — american tapered pipe threads

1/8-27 NPTTap 8.74 mmØ 10.29 mm · pitch 0.941 mm1/4-18 NPTTap 11.11 mmØ 13.72 mm · pitch 1.411 mm3/8-18 NPTTap 14.68 mmØ 17.15 mm · pitch 1.411 mm1/2-14 NPTTap 17.86 mmØ 21.34 mm · pitch 1.814 mm3/4-14 NPTTap 23.42 mmØ 26.67 mm · pitch 1.814 mm1-11.5 NPTTap 29.36 mmØ 33.4 mm · pitch 2.209 mm1-1/4-11.5 NPTTap 38.1 mmØ 42.16 mm · pitch 2.209 mm1-1/2-11.5 NPTTap 44.05 mmØ 48.26 mm · pitch 2.209 mm