NPSpipe60° flankASME B1.20.1

2-11.5 NPS Thread Dimensions

2-11.5 NPS is a pipe National Pipe Straight thread. There are 11.5 threads per inch on a 2.3748 in major diameter, giving a metric-equivalent pitch of 2.209 mm. The size label is a nominal bore rather than a diameter.

Major Ø2.3748 in

Threads per inch11.5

Pitch (metric)2.209 mm

Pitch Ø2.3185 in

Tap drill2.2882 in

Thread profile

millimetres unless stated

2-11.5 NPS — basic profile60° flank angle · Not to scale

Basic information

Designation: 2-11.5 NPS
Thread system: National Pipe Straight
Series: pipe
Standard: ASME B1.20.1
Basic profile: Unified profile, 0.8P thread height
Flank angle: 60°

Dimensions

Major diameter: 2.3748 in / 60.32 mm
Pitch (metric equivalent): 2.209 mm
Threads per inch: 11.5
Pitch diameter: 2.3185 in / 58.89 mm
Minor diameter (external): 2.2488 in / 57.12 mm
Minor diameter (internal): 2.2807 in / 57.93 mm
Thread depth: 0.0696 in / 1.767 mm
Recommended tap drill: Ø 2.2882 in / 58.12 mm

How these values are derived

tabulated standard values

This is a pipe thread, so the published dimensions are tabulated values from ASME B1.20.1 rather than figures derived from a formula: a pipe size is a nominal bore, and the relationship between that bore and the thread diameter is historical, not geometric. Diameters are quoted at the gauge plane; the thread itself is tapered, so the actual size changes along its length.

Compatible parts0 specification pages

No specification in this database uses 2-11.5 NPS. That is expected: the catalogue covers machine screws, bolts, nuts and washers, and pipe threads belong to fittings, which are a separate family of parts. The dimensions above are still the standard ones for the thread itself.

Neighbouring sizes in National Pipe Straight.

3/4-14 NPS 1-11.5 NPS 1-1/4-11.5 NPS 1-1/2-11.5 NPS 2-1/2-8 NPS 3-8 NPS