An unusual thread…maybe

An unusual thread…maybe

This topic has 5 replies, 4 voices, and was last updated 23 December 2016 at 18:15 by Breva.

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23 December 2016 at 00:13 #24955
Breva
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@breva
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23 December 2016 at 00:13 #273361
Breva
Participant
@breva
A friend of mine was rebuilding a 3" marine pump and the technical spec for the thread on one end of the drive shaft specified a thread which was described as G3/4A, that is G threequarter A, with a major diameter of some 26mm.

Not one we came across before and 3/4" being about 18mm we were a bit puzzled. It seemed to be about 14TPI.

Can any knowledgeable person on the forum give me any information as to what we might be dealing with please?

John
23 December 2016 at 00:42 #273362
Michael Gilligan
Participant
@michaelgilligan61133
John,

It may be to with DIN 908 or DIN 910 parts

… see here: **LINK**

http://www.hytec-hydraulik.com/standard-parts/lock-screws.html

MichaelG.
23 December 2016 at 01:10 #273364
Keith Rogers 2
Participant
@keithrogers2
Hi John,

It's G series 3/4 BSP Parallell thread that's 14 TPI.

Whitworth form (55deg) 1.04" major diameter.

Keith.

Edited By Keith Rogers 2 on 23/12/2016 01:14:55
23 December 2016 at 07:24 #273371
JasonB
Moderator
@jasonb
Find that description on european plumbing fittings quite often as Keith says 3/4BSP external

See thread designations for what the numbers and letters mean

Edited By JasonB on 23/12/2016 07:50:38
23 December 2016 at 18:15 #273460
Breva
Participant
@breva
That was quick! Thank you all for your help. Much appreciated indeed and problem solved.

Best wishes to you all for Christmas.

John
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