How To Clean 3/4 Inch Pipe Female Thresds
British Standard Piping: The Plumbing Standard
British Standard Pipe is the standard thread used on plumbing fittings across most of the world (simply not in N America). Beneath, you'll find tables showing BSP sizes in mm; tables detailing the difference betwixt BSP and the American standard NPT; an caption of direct and tapered thread types; and a handy thread size ruler and template to print out and employ at home.
- Download our BSP Thread Size Template here -
The nominal size refers non to the outside of the piping, nor even to the outside of the thread, but to its internal bore - the inside of the tube where the fluid flows. It makes sense when sizing pipes for flow charge per unit but it makes things confusing when measuring for replacement parts.
Below is a summary of the mutual BSP thread sizes in used with bandage iron radiators and their corresponding actual outside diameters in millimetres. The actual outside diameter is what you can measure when looking at a valve tail, a threaded nipple, reducing bush or an opening in the radiator.
BSP Sizes In Millimetres
| Nominal pipe size (BSP) | Threads per inch | Average thread diameter, mm |
| 1⁄viii " | 29 | 9.i |
| ane⁄iv " | 19 | 12.3 |
| iii⁄eight " | nineteen | 15.8 |
| one⁄2 " | fourteen | 19.viii |
| 3⁄four " | 14 | 25.iii |
| 1" | eleven | 31.8 |
| 1- 1⁄4 " | 11 | forty.iv |
| 1- 1⁄2 | eleven | 52.3 |
| 2" | xi | 58.one |
| 2- 1⁄2 " | 11 | 73.7 |
- Looking for replacement radiator parts? You'll observe them here. -
Grand & R Thread Types
G is the international standard shorthand for BSPP - BSP Parallel threads. R is the standard for BSPT - BSP Tapered. Parallel (G) threads are used where the seal is fabricated on a mating face, like within a cast iron radiator with the aid of a gasket. Tapered fittings achieve a tight thread-to-thread seal with the help of a little sealant such as PTFE record or hemp and Dominate White.
Right first fourth dimension
We've made a handy PDF that you can print out at home to apply every bit a estimate when measuring threads. Download our BSP Thread Size Template, print information technology onto A4 newspaper at 100% calibration and follow the instructions. It includes circles that are sized for diverse BSP threads also every bit a handy cutting-off tape measure out that wraps around the pipe if the ends aren't accessible.
- Download our BSP Thread Size Template hither -
The difference betwixt BSP and NPT
NPT - National Pipe Thread - is the U.s.a. standard. Most of the rest of the world uses BSP - British Standard Pipe.
NPT has flattened peaks and troughs where BSP is rounded. NPT has a thread bending of 60º where BSP is 55º.
At certain sizes, NPT and BSP share the same number of threads per inch - at ½" and ¾" - but at all other sizes the two are quite dissimilar. The table beneath lists the TPI for both NPT and BSP at sizes usually used with domestic radiators.
| Nominal pipe size | NPT | BSP |
| Threads per inch | Threads per inch | |
| 1⁄eight " | 27 | 28 |
| ane⁄4 " | 18 | 19 |
| 3⁄eight " | xviii | 19 |
| ane⁄2 " | 14 | 14 |
| 3⁄four " | fourteen | fourteen |
| one" | 11-ane⁄ii | 11 |
| i- 1⁄iv " | xi-1⁄2 | 11 |
| i- one⁄2 | xi- one⁄2 | xi |
| 2" | xi- one⁄2 | 11 |
| 2- 1⁄2 " | 8 | xi |
The threads we utilize in our radiators
In brief: products for auction in the U.k. and Europe ship with BSP threads; products that nosotros export to North America are fitted with NPT threads.
Our radiators are delivered with factory-installed ½" BSP bushes as standard.
Our valves utilise self-sealing BSP tails and 15mm pinch fittings.
View our complete range of replacement parts for DIY radiator refurbishment.
Source: https://www.castrads.com/uk/resources/bsp-thread-size-guides/
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