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Sizes · Pipe (NPT / BSPT / BSPP)

NPT — American tapered pipe

2-11.5 NPT

2-11.5 NPT pipe thread: 11.5 TPI, major Ø 60.33 mm.

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Tap drill
56.36 mm
60.33 mm major Ø

Profile

Thread form & key diameters

Major Ø 60.33 mmP 2.209 mm60°Root Ø 57.62 mm · Pitch Ø 58.895 mm2-11.5 NPT11.5 TPI · 60° form

Dimensions

Designation2-11.5 NPT
Major (outside) diameter60.33 mm · 2.3752"
Pitch2.209 mm · 11.5 TPI
Pitch diameter58.895 mm · 2.3187"
Minor diameter (external)57.62 mm · 2.2685"
Minor diameter (internal)57.939 mm · 2.2811"
Recommended tap drill56.36 mm

What tap drill do I need for 2-11.5 NPT?

2-11.5 NPT is a NPT pipe thread running at 11.5 threads per inch on a 60.33 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.

Nearby sizes

More npt — american tapered pipe threads

1-1/2-11.5 NPTTap 44.05 mmØ 48.26 mm · pitch 2.209 mm2-1/2-8 NPTTap 67.06 mmØ 73.03 mm · pitch 3.175 mm1-1/4-11.5 NPTTap 38.1 mmØ 42.16 mm · pitch 2.209 mm1-11.5 NPTTap 29.36 mmØ 33.4 mm · pitch 2.209 mm3-8 NPTTap 82.7 mmØ 88.9 mm · pitch 3.175 mm3/4-14 NPTTap 23.42 mmØ 26.67 mm · pitch 1.814 mm1/2-14 NPTTap 17.86 mmØ 21.34 mm · pitch 1.814 mm3/8-18 NPTTap 14.68 mmØ 17.15 mm · pitch 1.411 mm