B.S.P.T.

British Standard Pipe Thread


British Standard Pipe Thread 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.


A list of 16 thread sizes are defined by the standards, ranging from 1/16 inch to 6 inch. The size was originally based on the inner diameter measured in inches of a steel tube for which the thread was intended. This often causes confusion, as people think the size refers to the outside diameter of the male thread.

Two types of threads are used:

Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP)

Taper threads, British Standard Pipe Taper thread (BSPT)

Just to confuse things, often the T in BSPT refers to Thread and doesn't indicate either Taper or Parallel.

The threadform follows the British Standard Whitworth standard


The table below shows dimensions for male threads.


Thread

Threads per inch

Pitch mm

Outside Diameter mm

Outside Diameter inches

1/16 inch

28

0.907

7.723

0.304

1/8 inch

28

0.907

9.728

0.383

1/4 inch

19

1.337

13.157

0.518

3/8 inch

19

1.337

16.662

0.656

1/2 inch

14

1.814

20.995

0.825

5/8 inch

14

1.814

22.991

0.902

3/4 inch

14

1.814

26.441

1.041

1 inch

11

2.309

33.249

1.309

1¼ inch

11

2.309

41.910

1.650

1½ inch

11

2.309

47.803

1.882

2 inch

11

2.309

59.614

2.347

2½ inch

11

2.309

75.184

2.96

3 inch

11

2.309

87.884

3.46

4 inch

11

2.309

113.030

4.45

5 inch

11

2.309

138.430

5.45

6 inch

11

2.309

163.830

6.45


This is a 1/2 Inch thread, you can count 14 threads in one inch.
Example of half inch BSP thread


An end view of a 1/2 Inch male thread
End view of half inch BSP thread


As the name of the sizing does not match the actual diameter, there can be some confusion over sizing. We have shown some pictures of two of the more popular sizes along side popular UK coins.

First, a half inch thread which is similar in size to a 1 penny coin.

Half inch BSP thread shown against 1p coin


Second, a three quarter inch thread which is similar in size to a 2 pence coin :
3/4 inch BSP thread shown against 2p coin


Typical uses and sizes are :

1/4 Inch - Compressed air connections

3/8 Inch - Oil line connections

1/2 Inch - Bathroom basin and kitchen sink taps, radiator inlets, old outside tap outlets

5/8 Inch - Old outside tap outlets (very rare)

3/4 Inch - Bath taps, washing machine inlet hose connections, modern outside tap outlets

1 Inch - Domestic heating boilers and hot water cylinders

1-1/4 Inch - Wash hand basin wastes (bathroom sink)

1-1/2 Inch - Kitchen sink wastes, bath wastes, toilet syphon outlets

2-1/4 Inch - Immersion water heater elements


A selection of "Black Iron" BSP fittings :

Selection of BSP fittings


Plumbing fittings with BSP threads on ebay :

1/2 Inch BSP Male x 3/8 Inch BSP Female Brass Adaptor With Washer

£2.99
End Date: Friday Jan-3-2020 13:36:24 GMT
Buy It Now for only: £2.99
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Chrome 1/2 Inch BSP Male to Female Tap Thread Extension

£4.49
End Date: Wednesday Jan-1-2020 17:53:26 GMT
Buy It Now for only: £4.49
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6mm Compression x 1/4 Inch BSP Male Iron Straight Adaptor | Brass Fitting

£2.99
End Date: Sunday Jan-5-2020 15:00:36 GMT
Buy It Now for only: £2.99
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European Monobloc Tap Connector Adaptors (Pair) 15mm x 3/8 Inch BSP Male

£4.99
End Date: Sunday Jan-5-2020 7:48:11 GMT
Buy It Now for only: £4.99
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1/8 Inch BSP Automatic Air Vent Valve

£2.99
End Date: Friday Dec-20-2019 14:23:00 GMT
Buy It Now for only: £2.99
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Outside Tap Wall Plate Tee | 15mm Compression x 1/2 Inch BSP

£10.99
End Date: Sunday Dec-22-2019 16:42:41 GMT
Buy It Now for only: £10.99
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Radiator Valve Tail 15mm Compression x 1/2 Inch BSP

£3.99
End Date: Saturday Dec-21-2019 13:11:50 GMT
Buy It Now for only: £3.99
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1/4 Inch BSP Brass Hose Tail Connection | British Standard Pipe Thread Fitting

£3.99
End Date: Wednesday Jan-8-2020 15:11:24 GMT
Buy It Now for only: £3.99
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15mm End Feed x 1/2" BSP Elbow Tap Connector | Solder Plumbing Fitting

£2.05
End Date: Tuesday Jan-14-2020 11:01:33 GMT
Buy It Now for only: £2.05
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3/4 Inch BSP Plastic Flanged Back Nuts (Pack of 2) Plumbing Fittings

£2.49
End Date: Monday Dec-16-2019 16:57:42 GMT
Buy It Now for only: £2.49
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1/2 Inch BSP Plastic Flanged Back Nuts (Pack of 2)

£2.25
End Date: Monday Dec-16-2019 16:56:22 GMT
Buy It Now for only: £2.25
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Washing Machine Waste Hose Connector Nozzle / Spigot | 1" BSP Angled

£4.49
End Date: Tuesday Dec-31-2019 9:27:31 GMT
Buy It Now for only: £4.49
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3/8" x 1/4" BSP Black Malleable Iron Hex Reducing Nipple

£3.49
End Date: Saturday Dec-28-2019 19:32:05 GMT
Buy It Now for only: £3.49
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15mm x 1/2" BSP Service Valve | Chrome Plated Brass Isolation Valve

£3.59
End Date: Wednesday Jan-8-2020 9:53:59 GMT
Buy It Now for only: £3.59
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3/4 Inch BSP Male to Female Brass Tap Thread Extension

£4.75
End Date: Friday Jan-3-2020 18:00:05 GMT
Buy It Now for only: £4.75
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1/2 Inch BSP Male to Female Brass Tap Thread Extension | 2 Pack

£3.99
End Date: Friday Jan-3-2020 17:56:49 GMT
Buy It Now for only: £3.99
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Washing Machine Waste Hose Connector Nozzle / Spigot | 1" BSP Straight

£4.49
End Date: Thursday Jan-9-2020 21:21:46 GMT
Buy It Now for only: £4.49
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3/8" BSP Black Malleable Iron Equal Tee | Threaded Plumbing Fitting

£2.99
End Date: Saturday Jan-4-2020 17:15:08 GMT
Buy It Now for only: £2.99
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1/4" BSP Black Malleable Iron Hex Nipple | British Standard Pipe Thread Fitting

£2.75
End Date: Saturday Jan-4-2020 16:07:44 GMT
Buy It Now for only: £2.75
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3/8" x 1/4" BSP Black Malleable Iron Reducing Bush | Male x Female

£2.49
End Date: Saturday Jan-4-2020 15:44:11 GMT
Buy It Now for only: £2.49
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1/2" x 3/8" BSP Black Malleable Iron Reducing Bush | Male x Female

£2.49
End Date: Saturday Jan-4-2020 15:42:51 GMT
Buy It Now for only: £2.49
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1/8 Inch BSP Manual Air Vent Bleed Valve For Radiators & Heating Systems

£2.69
End Date: Saturday Jan-4-2020 14:46:45 GMT
Buy It Now for only: £2.69
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1/4 Inch BSP Manual Air Vent Bleed Valve For Radiators & Heating Systems

£1.99
End Date: Saturday Jan-4-2020 14:44:54 GMT
Buy It Now for only: £1.99
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15mm Compression x 3/4 Inch BSP Male Iron Elbow | Brass Plumbing Fitting

£6.65
End Date: Monday Dec-30-2019 15:59:08 GMT
Buy It Now for only: £6.65
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15mm Compression x 1/4 Inch BSP Male Iron Straight Adaptor | Brass Fitting

£3.49
End Date: Monday Dec-30-2019 15:36:15 GMT
Buy It Now for only: £3.49
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15mm Compression x 3/8 Inch BSP Female Iron Straight Adaptor

£2.75
End Date: Monday Dec-30-2019 15:32:27 GMT
Buy It Now for only: £2.75
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15mm Compression x 3/8 Inch BSP Male Iron Straight Adaptor | Brass Fitting

£3.20
End Date: Thursday Dec-26-2019 10:54:35 GMT
Buy It Now for only: £3.20
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Shower Hose / Head Adaptor 3/4 to 1/2 Inch BSP Chrome Reducer

£3.99
End Date: Sunday Dec-29-2019 20:40:14 GMT
Buy It Now for only: £3.99
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3/4 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£5.65
End Date: Monday Dec-16-2019 10:07:06 GMT
Buy It Now for only: £5.65
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1/2 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£2.85
End Date: Monday Dec-16-2019 10:04:58 GMT
Buy It Now for only: £2.85
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3/8 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£2.75
End Date: Monday Dec-16-2019 10:02:18 GMT
Buy It Now for only: £2.75
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1/4 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£1.99
End Date: Monday Dec-16-2019 9:49:34 GMT
Buy It Now for only: £1.99
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1/8 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£2.79
End Date: Monday Dec-16-2019 9:41:58 GMT
Buy It Now for only: £2.79
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Washing Machine Appliance Waste Trap Blanking Cap and Washer | 1 Inch BSP

£2.99
End Date: Monday Dec-16-2019 8:57:03 GMT
Buy It Now for only: £2.99
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1-1/4 Inch BSP Alloy Flanged Back Nut | Bathroom Basin Waste Size

£2.99
End Date: Monday Dec-16-2019 7:31:29 GMT
Buy It Now for only: £2.99
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Immersion Heater Element Mechanical Flange 2-1/4 Inch BSP

£18.99
End Date: Tuesday Dec-31-2019 8:10:37 GMT
Buy It Now for only: £18.99
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1/2" BSP Drain Cock Valve Type B

£3.39
End Date: Sunday Jan-12-2020 13:56:17 GMT
Buy It Now for only: £3.39
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3 Bar Pressure Relief Valve | 1/2 Inch BSP Female x Female

£7.99
End Date: Tuesday Jan-14-2020 11:31:07 GMT
Buy It Now for only: £7.99
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Spring Safety Valve / Pressure Relief Valve | 1/2 Inch BSP

£3.99
End Date: Tuesday Jan-14-2020 10:42:44 GMT
Buy It Now for only: £3.99
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1/8 Inch BSP Brass Hex Nipple | British Standard Pipe Thread Fitting

£2.35
End Date: Monday Jan-13-2020 16:53:31 GMT
Buy It Now for only: £2.35
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1-1/2 Inch BSP Plastic Back Nut | Kitchen Sink Waste Size **Not Bathroom Basin**

£2.45
End Date: Sunday Jan-12-2020 9:19:06 GMT
Buy It Now for only: £2.45
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3/4 Inch BSP Brass Flanged Back Nut | British Standard Pipe Thread Fitting

£2.25
End Date: Sunday Jan-12-2020 9:19:03 GMT
Buy It Now for only: £2.25
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1/8 Inch BSP Brass Female x Female Elbow | British Standard Pipe Thread Fitting

£3.99
End Date: Saturday Jan-11-2020 9:10:17 GMT
Buy It Now for only: £3.99
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3/4 Inch BSP Gate Valve | Brass Valve With Red Handle Female x Female

£6.88
End Date: Friday Jan-10-2020 22:07:46 GMT
Buy It Now for only: £6.88
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3/4 Inch x 1/2 Inch BSP Brass Reducing Bush | Male x Female

£2.37
End Date: Friday Jan-10-2020 21:15:18 GMT
Buy It Now for only: £2.37
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1/8 Inch BSP Brass Male x Female Elbow | British Standard Pipe Thread Fitting

£3.99
End Date: Friday Jan-10-2020 14:55:24 GMT
Buy It Now for only: £3.99
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1-1/4 Inch BSP Plastic Flanged Back Nut | Bathroom Basin Waste Size

£2.45
End Date: Friday Jan-10-2020 14:55:12 GMT
Buy It Now for only: £2.45
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1/2 Inch BSP Chrome Cap / Blank Nut With Washer | Blanks Bath Tap Shower Outlet

£2.99
End Date: Friday Jan-10-2020 14:43:29 GMT
Buy It Now for only: £2.99
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1/2 Inch BSP Brass Socket / Coupler | British Standard Pipe Thread Fitting

£3.19
End Date: Friday Jan-10-2020 12:19:28 GMT
Buy It Now for only: £3.19
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1 Inch BSP Brass Socket / Coupler | British Standard Pipe Thread Fitting

£7.39
End Date: Friday Jan-10-2020 12:19:26 GMT
Buy It Now for only: £7.39
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