British Standard Pipe

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The British Standard Pipe (BSP) is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread and has been adopted as a standard scale used in plumbing fittings, except in the United States where NPT is the standard used.

Types[edit]

Two types of threads are distinguished:

BSPT Pipe Threads.

[2]

These can be combined into two types of joints:

Thread form[edit]

The thread form follows the British Standard Whitworth standard:

Pipe thread sizes[edit]

Example table of sizes from a German manufacturer

A list of 16 thread sizes are defined by the standards, ranging from 116 to 6. The size number was originally based on the inner diameter (measured in inches) of a steel tube for which the thread was intended, but contemporary pipes tend to use thinner walls to save material, and thus have an inner diameter larger than this nominal size. In the modern standard metric version, it is simply a size number, where listed diameter size, is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" from the small end of the thread. The taper is 1 to 16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.

Dash
thread
size
BSP
size
(in)
Thread pitchThread major
diameter
Thread minor
diameter[3][4]
A/F
(mm)
Gauge
length
(mm)
Corresponding pipeTapping drill
size (mm)
/in
(TPI)
(mm)(mm)(in)(mm)(in)DN
(mm)
OD
(mm)
OD
(in)
Thickness
(mm)
BSP.PL
(Rp)
BSP.F
(G)
−1116280.9077.7230.3046.5610.25834±0.96.606.80
−218280.9079.7280.3838.5650.3372154±0.9610.20.4028.608.80
−414191.33713.1570.51811.4450.4506196±1.3813.50.532.311.5011.80
−638191.33716.6620.65614.9500.588622/236.4±1.31017.20.682.315.0015.25
−812141.81420.9550.82518.6330.7336278.2±1.81521.30.842.618.7519.00
−1058141.81422.9110.90220.5890.8106162.6-21.00
−1234141.81426.4411.04124.1200.9496329.5±1.82026.91.062.624.2524.50
−161112.30933.2491.30930.2921.19264310.4±2.32533.71.333.230.4030.75
−201 14112.30941.9101.65038.9531.53365312.7±2.33242.41.673.239.0039.50
−241 12112.30947.8031.88244.8461.76565712.7±2.34048.31.903.245.0045.00
−322112.30959.6142.34756.6572.23067015.9±2.35060.32.373.656.7557.00
−402 12112.30975.1842.96072.2272.843617.5±3.56576.13.003.6
−483112.30987.8843.46084.9273.343620.6±3.58088.93.504
−644112.309113.0304.450110.0734.333625.5±3.5100114.34.504.5
−805112.309138.4305.450135.4725.333528.6±3.5125139.75.505
−966112.309163.8306.450160.8726.333528.6±3.5150165.16.505

Pipe thread designations[edit]

These standard pipe threads are formally referred to by the following sequence of blocks:

Threads are normally right-hand. For left-hand threads, the letters "LH" are appended.

Example: Pipe thread EN 10226 Rp 2½

The terminology for the use of G and R originated from Germany (G for gas, as it was originally designed for use on gas pipes; R for rohr (meaning pipe).)

See also[edit]

References[edit]

External links[edit]