An unusual thread…maybe

[BrevaParticipant @breva]

[BrevaParticipant @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

[Michael GilliganParticipant @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.

[Keith Rogers 2Participant @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

[JasonBModerator @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

[BrevaParticipant @breva]

That was quick! Thank you all for your help. Much appreciated indeed and problem solved.

Best wishes to you all for Christmas.

John

[Author]

Posts