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Hose thread queery

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fizzy12/07/2020 16:56:40
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1716 forum posts
116 photos

Im looking at a water pump on ebay **LINK**

the item describes the thread coupling as 2E - hose 20: 2M screw 20 (3/4). Whilst I can make assumptions as to what the thread is can someone in the know please tell exactly what this means in easy speak? Thanks.

colin vercoe12/07/2020 17:23:36
44 forum posts

3/4" BSP

Howard Lewis12/07/2020 21:32:07
3375 forum posts
2 photos

Like Colin, BSP would be my first thought., with the OD and pitch to confirm. Europe calls BSP "Gaz"

Howard

Paul Lousick12/07/2020 23:37:50
1448 forum posts
555 photos

When I click on the ebay link the description says "Sanso Magnetic Pump PMD-421 with a 3/4" connector (standard Hose Connector). Not as stated above by Fizzy "2E - hose 20: 2M screw 20 (3/4)". ??????

With the conversion to metric, imperial BSP sizes were rounded up. 3/4" became 20mm

The European terminology for the use of G (BSPP) and R (BSPT) originated from Germany (G for gas, as it was originally designed for use on gas pipes; R for rohr, meaning pipe.)

Paul

Bazyle13/07/2020 08:15:00
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5290 forum posts
201 photos

I like the way he seller has expressed the need for priming the pump. Could we have Please 'google it if unsure' as a banner on this site, even a permanet part of all internet browsers. devil

fizzy13/07/2020 08:44:32
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1716 forum posts
116 photos

Sure enough I put the wrong link in.....but the words are exactly taken from the link I should have put up......apologies all round.

Bo'sun13/07/2020 10:30:43
151 forum posts

Be wary of thread sizes given by some Far Eastern suppliers. They are not always what they appear to be, and not compatible with European fittings. I speak from experience.

I've also experienced issues sealing parallel BSP threads. No flange on the fitting, and no spotface on the pump, just an O-ring that immediately rolled out as the fitting was tightened.

Russell Eberhardt13/07/2020 15:39:24
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2593 forum posts
85 photos

It gets more confusing. Here in France 1/2 in BSP thread is called 21 mm, 3/4 BSP is called either 26 or 27 mm.

Note - Colin, 3/4 BSP has thread OD about 33 mm not 20 mm.

Russell

Edited By Russell Eberhardt on 13/07/2020 15:54:46

fizzy13/07/2020 21:04:01
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1716 forum posts
116 photos

well im none the wiser...just read that it might relate to NPT.....who knows?

Russell Eberhardt14/07/2020 16:31:54
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2593 forum posts
85 photos
Posted by fizzy on 13/07/2020 21:04:01:

well im none the wiser...just read that it might relate to NPT.....who knows?

I'm pretty sure that you will find that the 3/4" refers to the OD of the connector and that it will be 1/2" BSP.

Russell

fizzy17/07/2020 15:15:25
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1716 forum posts
116 photos

measured od at 26mm which i think makes it 3/4 bsp....s-l1600.jpg

Howard Lewis17/07/2020 16:56:56
3375 forum posts
2 photos

NPT uses different pitches, as well as thread form,(60 degrees ) from B S P. (55 degrees )

Many seem to differ by just just one pitch over an inch.. The combination renders them non interchangeable .

Howard

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