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 :

European Monobloc Tap Connector Adaptors (Pair) 15mm x 3/8 Inch BSP Male

£4.99
End Date: Wednesday Feb-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: Monday Jan-20-2020 14:23:00 GMT
Buy It Now for only: £2.99
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Radiator Valve Tail 15mm Compression x 1/2 Inch BSP

£3.99
End Date: Tuesday Jan-21-2020 13:11:50 GMT
Buy It Now for only: £3.99
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1/2 Inch BSP Brass Hose Tail Connection | British Standard Pipe Thread Fitting

£7.99
End Date: Saturday Feb-8-2020 15:15:59 GMT
Buy It Now for only: £7.99
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1/2 Inch BSP x 6 Inch Long Brass Running Nipple | British Standard Pipe Thread

£8.99
End Date: Tuesday Feb-11-2020 14:46:01 GMT
Buy It Now for only: £8.99
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3/4 Inch BSP Plastic Flanged Back Nuts (Pack of 2) Plumbing Fittings

£2.49
End Date: Sunday Feb-16-2020 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: Sunday Feb-16-2020 16:56:22 GMT
Buy It Now for only: £2.25
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Washing Machine Waste Hose Connector Nozzle / Spigot | 1 Inch BSP Angled

£4.49
End Date: Friday Jan-31-2020 9:27:31 GMT
Buy It Now for only: £4.49
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1/2 Inch BSP Brass Plain Blanking Plug | British Standard Pipe Thread Fitting

£2.49
End Date: Wednesday Jan-22-2020 9:58:58 GMT
Buy It Now for only: £2.49
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15mm x 1/2 Inch BSP Service Valve | Chrome Plated Brass Isolation Valve

£3.59
End Date: Saturday Feb-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: Monday Feb-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: Monday Feb-3-2020 17:56:49 GMT
Buy It Now for only: £3.99
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1 Inch BSP Black Malleable Iron Equal Tee | British Standard Pipe Thread

£6.34
End Date: Tuesday Feb-4-2020 17:06:37 GMT
Buy It Now for only: £6.34
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1/4 Inch BSP Black Malleable Iron Socket | British Standard Pipe Thread

£2.49
End Date: Tuesday Feb-4-2020 17:00:27 GMT
Buy It Now for only: £2.49
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1/4 Inch BSP Black Malleable Iron Blanking Plug | British Standard Pipe Thread

£2.49
End Date: Tuesday Feb-4-2020 16:44:19 GMT
Buy It Now for only: £2.49
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3/8 Inch BSP Black Malleable Iron Hex Nipple | British Standard Pipe Thread

£2.75
End Date: Tuesday Feb-4-2020 16:09:31 GMT
Buy It Now for only: £2.75
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1/4 Inch BSP Black Malleable Iron Hex Nipple | British Standard Pipe Thread

£2.75
End Date: Tuesday Feb-4-2020 16:07:44 GMT
Buy It Now for only: £2.75
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1/2 Inch x 1/4 Inch BSP Black Malleable Iron Reducing Bush | Male x Female

£2.49
End Date: Tuesday Feb-4-2020 15:41:49 GMT
Buy It Now for only: £2.49
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1 Inch BSP Black Malleable Iron Male x Female Elbow Fitting

£5.99
End Date: Tuesday Feb-4-2020 15:23:39 GMT
Buy It Now for only: £5.99
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1/4 Inch BSP Black Malleable Iron Male x Female Elbow Fitting

£2.75
End Date: Tuesday Feb-4-2020 15:17:33 GMT
Buy It Now for only: £2.75
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1/8 Inch BSP Manual Air Vent Bleed Valve For Radiators & Heating Systems

£2.69
End Date: Tuesday Feb-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: Tuesday Feb-4-2020 14:44:54 GMT
Buy It Now for only: £1.99
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15mm Compression x 1/4 Inch BSP Male Iron Straight Adaptor | Brass Fitting

£3.49
End Date: Thursday Jan-30-2020 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: Thursday Jan-30-2020 15:32:27 GMT
Buy It Now for only: £2.75
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15mm Compression x 1/4 Inch BSP Female Iron Straight Adaptor

£3.49
End Date: Thursday Jan-30-2020 15:27:09 GMT
Buy It Now for only: £3.49
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15mm Compression x 3/8 Inch BSP Male Iron Straight Adaptor | Brass Fitting

£3.20
End Date: Sunday Jan-26-2020 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: Wednesday Jan-29-2020 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: Sunday Feb-16-2020 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: Sunday Feb-16-2020 10:04:58 GMT
Buy It Now for only: £2.85
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1/4 Inch BSP Brass Running Nipple | British Standard Pipe Thread Fitting

£1.99
End Date: Sunday Feb-16-2020 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: Sunday Feb-16-2020 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: Sunday Feb-16-2020 8:57:03 GMT
Buy It Now for only: £2.99
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1-1/2 Inch BSP Alloy Back Nut | Kitchen Sink Waste Size ***Not Bathroom Basin***

£2.99
End Date: Sunday Feb-16-2020 7:32:54 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: Sunday Feb-16-2020 7:31:29 GMT
Buy It Now for only: £2.99
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1/2 Inch BSP Drain Cock Valve Type B

£3.39
End Date: Wednesday Feb-12-2020 13:56:17 GMT
Buy It Now for only: £3.39
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1 Inch BSP Brass Male x Female Elbow | British Standard Pipe Thread Fitting

£12.99
End Date: Tuesday Feb-4-2020 12:28:36 GMT
Buy It Now for only: £12.99
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Spring Pressure Relief Valve | 1/2 Inch BSP Safety Valve

£3.99
End Date: Friday Feb-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: Thursday Feb-13-2020 16:53:31 GMT
Buy It Now for only: £2.35
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3/8 Inch BSP Brass Flanged Back Nut | British Standard Pipe Thread Fitting

£2.79
End Date: Wednesday Feb-12-2020 9:21:47 GMT
Buy It Now for only: £2.79
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3/4 Inch BSP Brass Flanged Back Nut | British Standard Pipe Thread Fitting

£2.25
End Date: Wednesday Feb-12-2020 9:19:03 GMT
Buy It Now for only: £2.25
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3/4 Inch BSP Gate Valve | Brass Valve With Red Handle Female x Female

£6.88
End Date: Monday Feb-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: Monday Feb-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: Monday Feb-10-2020 14:55:24 GMT
Buy It Now for only: £3.99
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1/8 Inch BSP Brass Flanged Blanking Plugs (2 Pack) British Standard Pipe Thread

£3.49
End Date: Monday Feb-10-2020 14:43:49 GMT
Buy It Now for only: £3.49
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1/2 Inch BSP Chrome Cap / Blank Nut With Washer | Blanks Bath Tap Shower Outlet

£2.99
End Date: Monday Feb-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: Monday Feb-10-2020 12:19:28 GMT
Buy It Now for only: £3.19
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3/8 Inch BSP Brass Socket / Coupler | British Standard Pipe Thread Fitting

£2.64
End Date: Monday Feb-10-2020 12:19:21 GMT
Buy It Now for only: £2.64
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3/8 Inch BSP Brass Female x Female Elbow | British Standard Pipe Thread Fitting

£3.46
End Date: Monday Feb-10-2020 12:19:14 GMT
Buy It Now for only: £3.46
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1/2 Inch BSP Black Malleable Iron Cap / Blank Nut | Threaded Plumbing Fitting

£2.49
End Date: Monday Feb-10-2020 12:08:09 GMT
Buy It Now for only: £2.49
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1/2 Inch BSP Black Malleable Iron Hex Nipple | British Standard Pipe Thread

£2.85
End Date: Monday Feb-10-2020 12:02:32 GMT
Buy It Now for only: £2.85
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