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What size are these threads ??


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Hi, I've just bought a replacement oil pressure gauge but the thread is different to my existing capillary type. The original is a smiths (on the right) and I think it's a 1/8 npt but I'm stumped on the new one. If I can find the size I can order up a bush to mate it up. Any help would be appreciated :)

Paul

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Lets try again

kPM24v.jpg

 

Dunno without measurements of diameter and pitch. The Smiths one (presume actually the one on the left) will almost certainly be BSP rather than NPT. Surely if you bought the other one new there should be something with it to tell you, if not an actual fitting?

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Dunno without measurements of diameter and pitch. The Smiths one (presume actually the one on the left) will almost certainly be BSP rather than NPT. Surely if you bought the other one new there should be something with it to tell you, if not an actual fitting?

Bought it of ebay new but old stock so didn't come with any documentation

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Bought it of ebay new but old stock so didn't come with any documentation

 

Either follow Bee's advice, or carefully measure the outside diameter of the thread and its pitch (threads per inch or millimetre pitch) and somebody should be able to identify it.

 

Tim

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