Thread pitch 1/8 BSP

[Poke-E]

Simple question today. Is 1/8 BSP same as 1/8 BSPP?

 

[thammer]

Pitch is the same. BSPP is the same diameter on all threads and BSP is tapered getting smaller towards the last thread.

 

[Poke-E]

Ahhh, ok. So if I would like to replace a pressure gauge that is BSP I can replace with one that is BSPP with no issues, correct?

 

[thammer]

If the gauge threads are tapered then no. This shows how they work and seal. BSP stands for Brittish Pipe Thread. There's a tapered and parallel version.

 

[RobM123]

if you used a crush nylon washer you could , but it would be weaker

 

[Poke-E]

Could I use this in lue of the BTP? this is what I was am trying to do!

 

[jarmstrong]

T is for tapered

BSP Threads​

British standard pipe fittings are amongst the most popular threads in the world today.

Here is how to identify a BSP thread.

BSP threads come in two different variants:​

– Parallel (BSPP)

– Tapered (BSPT)

How To Identify British Pipe Threads - V-Flow Solutions

How to identify British Standard Pipe Threads are some of the most popular foreign threads in the world today. Find out how to measure the size of British pipe threads.

v-flowsolutions.co.uk

 

[SilentSquirrel]

Simple question today. Is 1/8 BSP same as 1/8 BSPP?

@jarmstrong 's post has it all correct

FYI
1/8 BSP is the same as 1/8 BSPP and is a straight thread (p meaning parallel)
This what's used in air guns
BSPT is tapered and is not commonly used with high pressure air

 

[bigHUN]

1/8 NPT (North American) and 1/8 BSP (European) are the same pitch, only BSPP (I don't think you will find these openly in NA) a bit different cone vs NPT.
Also 10 mm (Asian) is a parallel thread very close pitch and can be partially threaded in BSP...I tried these work with bottom puck.
The only difference between these four is - how and where they seal.

 

[Ta-Ta Toothie]

They are not the same pitch. Close but different.

 

[SilentSquirrel]

They are not the same pitch. Close but different.

1/8" NPT = 27 threads per inch tapered
1/8 BSP = 28 threads per inch parallel
They are not compatible

In fact, using a mismatched pair of threads with HPA can be dangerous

just my too sense
Edward

 

[Ta-Ta Toothie]

1/8" NPT = 27 threads per inch tapered
1/8 BSP = 28 threads per inch parallel
They are not compatible

In fact, using a mismatched pair of threads with HPA can be dangerous

just my too sense
Edward

agreed, one is 55° and the other 60°

 

[OTmachine]

Try this. See attached.

View attachment FittingIdentify 2.pdf