Hose thread queery

[nigel jones 5Participant @nigeljones5]

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.

[nigel jones 5Participant @nigeljones5]

[colin vercoeParticipant @colinvercoe57719]

3/4" BSP

[Howard LewisParticipant @howardlewis46836]

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

Howard

[Paul LousickParticipant @paullousick59116]

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

[BazyleParticipant @bazyle]

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.

[nigel jones 5Participant @nigeljones5]

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’sunParticipant @bosun58570]

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 EberhardtParticipant @russelleberhardt48058]

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

[nigel jones 5Participant @nigeljones5]

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

[Russell EberhardtParticipant @russelleberhardt48058]

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

[nigel jones 5Participant @nigeljones5]

measured od at 26mm which i think makes it 3/4 bsp….

[Howard LewisParticipant @howardlewis46836]

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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