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Motor Gland

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Dave Springate07/04/2019 13:14:25
56 forum posts
121 photos

Hi, I'm trying to locate a Gland that fits this hole and thread, rather than just jam a plastic one in there. Anyone got any idea's as to if they are available from anywhere? I'm having no luck locating one at all.



John Haine07/04/2019 13:30:54
2548 forum posts
132 photos

Standard item from good electrical supplier that sells to the trade.

Paul Kemp07/04/2019 13:45:43
283 forum posts
9 photos


Visit your local City Elctrical Factors they will likely have something in either plastic, brass or steel. However some old motors I have had some very odd threads which don't match modern standards. The one on my mill dating back to around 1960 I had to tap out to (from memory) 22mm in order to get a gland that would accept screened cable.


Simon Williams 307/04/2019 13:47:25
387 forum posts
65 photos


Not necessarily.

Depends on whether it's an imperial (e.g. 3/4 inch x 16 TPI) thread, a metric thread (e.g.M20 x 1.5 pitch) or a Pg thread which goes by the nominal bore size of the conduit.

If you can measure I.d and pitch of the thread in the hole we'd be in with a chance. The other clue is what make and nationality is the motor, and how old?

HTH Simon

3404607/04/2019 13:52:53
483 forum posts
3 photos

Looks like a standard 20mm gland - plenty on ebay.

As long as it goes through the hole, mine came with a locknut so perhaps matching the thread is not critical.?


Nicholas Farr07/04/2019 13:59:03
1881 forum posts
919 photos

Hi, any electrical factor should have them. Have you looked in B&Q **LINK** or Screwfix **LINK**

Regards Nick.

Dave Springate07/04/2019 14:53:07
56 forum posts
121 photos

Hi, it's not M20 that's for sure, I've tried it. Its an old Crompton Parkinson motor of unknown age. I suspect its imperial and everything I've looked up is metric. Can't seem to find a stockist of imperial fittings. I know its not really important but would have liked to get the proper fitting gland if at all possible.

Alistair Robertson 107/04/2019 15:19:24
48 forum posts
6 photos

Motor threads are "usually" 3/4" Condiut. 750" o.d. x 16 threads per inch, These are NOT BSP.

Condiut is designated by the Outside Diameter.

BSP threads are designated by the nominal bore of the pipe.



Frances IoM07/04/2019 15:51:38
613 forum posts
22 photos
3/4" by 16tpi = 3/4 UNF - dies readily available for this - even if motor is probably Whitworth thread a brass fitting should fit
Dave Springate07/04/2019 16:29:49
56 forum posts
121 photos
Posted by Alistair Robertson 1 on 07/04/2019 15:19:24:

Motor threads are "usually" 3/4" Condiut. 750" o.d. x 16 threads per inch, These are NOT BSP.

Condiut is designated by the Outside Diameter.

BSP threads are designated by the nominal bore of the pipe.



Thanks Alistair yes

Phil Whitley07/04/2019 16:32:36
839 forum posts
105 photos

looks like 3/4 conduit, which means, no you wont get one anywhere unles you can find an old sparks like me who has some in a tin under the bench! If you have any long established electrical engineers near you, try them!

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