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Breva	23/12/2016 00:13:16
91 forum posts 7 photos	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
Michael Gilligan	23/12/2016 00:42:39
23121 forum posts 1360 photos	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.
Keith Rogers 2	23/12/2016 01:10:44
88 forum posts 2 photos	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
JasonB	23/12/2016 07:24:51
25215 forum posts 3105 photos 1 articles	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
Breva	23/12/2016 18:15:07
91 forum posts 7 photos	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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