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What imperial madness is this?
scudderfish - 26/7/25 at 01:40 PM

Replacing the faceplate/transformer on a shaver socket in the bathroom. The two bolts that held the old one to the back box are too short for the new one. They're bigger than M3, but smaller than M4 (and as far as I'm aware, M3.5 is not a thing) so I'm assuming they're some imperial thread. Any ideas what I need to buy?

Regards,
David

[Edited on 26/7/25 by scudderfish]

scudderfish - 26/7/25 at 01:49 PM

Ignore me, M3.5 is a thing after all!

https://www.ebay.co.uk/itm/224090853366?_ul=GB&loc_physical_ms=4923&loc_interest_ms=

adithorp - 26/7/25 at 02:50 PM

4BA is 3.6mm. How old is the original fitting

scudderfish - 26/7/25 at 04:36 PM

quote:
Originally posted by adithorp
4BA is 3.6mm. How old is the original fitting


Probably dates back to the house build circa 1991

gremlin1234 - 26/7/25 at 04:49 PM

quote:
Originally posted by scudderfish
Ignore me, M3.5 is a thing after all!

https://www.ebay.co.uk/itm/224090853366?_ul=GB&loc_physical_ms=4923&loc_interest_ms=


yep 3.5mm is very common on uk mains faceplates. I think they are also used on bar 'pumps' for the name 'clips'

Myke 2463 - 27/7/25 at 05:12 AM

13a sockets and light switches use 3.5mm screws , different lengths available.

Fatgadget - 27/7/25 at 07:57 AM

Reminds me of a very important project_Different collaborating engineers unwittingly working in both imperial and metric units. End result ...Royally screwing things up! (kindly excuse the the pun!)