British Standard Pipe Thread | BSP Thread Chart

British Standard Pipe Thread | BSP Thread Chart

  BSP Thread

British Standard Pipe (BSP) has been use as standard in plumbing and pipe fittings. There are two types of BSP Thread available. One is Parallel threads or we can say Straight threads and second one is Taper Thread.

BSP is BRITISH STANDARD PIPE – Also known as Whitworth 55° Thread Form

BSPT is BRITISH STANDARD PIPE TAPER – Thread form per AS 1722.1, BS 21, ISO 7

BSPP is BRITISH STANDARD PIPE PARALLEL – Thread form per AS 1722.2, ISO 228

  British Standard Pipe Parallel Thread (BSPP)

British Standard Pipe Parallel thread (BSPP) also known as British Standard Pipe Fitting thread (BSPF) and British Standard Pipe Mechanical thread (BSPM). Female and Male thread are both parallel.

BSPP thread used where a pressure-tight joint is achieved by the compression of a soft material (such as an o-ring seal or a washer) between the end face of the male thread and a socket or nipple face, with the tightening of a backnut.

  British Standard Pipe Taper Thread (BSPT)

British Standard Pipe Taper thread (BSPT) whose diameter increases or decreases along the length of the thread.

BSPT thread used where pressure-tightness is made through the mating of two threads together. In International standards require all Female thread is parallel and male thread is tapered. Female thread can also be tapered but this is not common.

  Thread Count (TPI)

TPI stands for Threads Per Inch, Means the total number of threads per inch measured along the length of a fastener. TPI is used only with American fasteners. Metric Fasteners use a thread Pitch. In general, smaller fasteners have finer threads, so the thread count is higher.

  Thread Pitch

Metric fasteners are specified with a thread pitch instead of a thread count. The thread pitch is the distance between threads expressed in millimeters. In general, smaller fasteners have finer thread so they have lower thread pitch.

  BSP Thread Charts

BSP Thread Chart

  British Standard Pipe Parallel Thread Chart | BSPP Thread Chart

Size Pitch External Thread OD Internal Thread ID
inch TPI mm inch mm inch
1/8 28 9.6 0.38 8.6 0.34
1/4 19 13.0 0.51 11.9 0.47
3/8 19 16.5 0.65 15.2 0.6
1/2 14 20.8 0.82 19.1 0.75
5/8 14 22.8 0.9 20.8 0.82
3/4 14 26.3 1.04 24.6 0.97
1 11 31.1 1.3 30.7 1.21
1-1/4 11 41.8 1.64 39.4 1.55
1-1/2 11 47.7 1.88 45.5 1.79
2 11 59.5 2.34 57.4 2.26
2-1/2 11 75.1 2.95 72.6 2.86
3 11 87.9 3.46 85.4 3.36

  British Standard Pipe Taper Thread Chart | BSPT Thread Chart

Size Pitch External Thread OD Internal Thread ID
inch TPI mm inch mm inch
1/8 28 9.5 0.37 8.4 0.33
1/4 19 12.8 0.5 11.2 0.44
3/8 19 16.3 0.64 14.7 0.59
1/2 14 20.4 0.8 18.3 0.72
5/8 14 22.5 0.89 20.6 0.81
3/4 14 25.9 1.02 23.9 0.94
1 11 32.6 1.28 29.7 1.17
1-1/4 11 41.1 1.62 38.6 1.52
1-1/2 11 47.0 1.85 44.5 1.75
2 11 58.6 2.31 56.4 2.22
2-1/2 11 74.1 2.92 71.9 2.83
3 11 86.6 3.41 84.6 3.33

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