Identify imperial bolt size

[SillyOldDufferModerator @sillyoldduffer]

Posted by john halfpenny on 27/06/2023 16:31:37:

I keep my metric and imperial electrical socket screws in separate tins since first encountering this 25 years ago. They are not interchangeable.

You're not trying hard enough John!

Dave (Bodger First Class, mentioned in Despatches, not in a good way…)

[Ian ParkinParticipant @ianparkin39383]

When did electrical back boxes change over to metric then?

were they 4 BA then changed over to m3.5

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Ian Parkin on 27/06/2023 17:01:10:

When did electrical back boxes change over to metric then?

were they 4 BA then changed over to m3.5

.

1. Sorry, can’t remember … but it was decades ago
2. Yes …

.

**LINK** 

https://www.orbitalfasteners.co.uk/products/m3-5-x-50-electrical-switch-plate-pattress-screw-din-964-steel-nickel

MichaelG.

Edited By Michael Gilligan on 27/06/2023 17:13:23

[bernard towersParticipant @bernardtowers37738]

My house is 74 and they are all 3.5mm MK patresses so that makes it 49 years, my how time flies!

[Margaret TrelawnyParticipant @margarettrelawny34058]

Bolt size update:

hi all, thanks for all your input and suggestions. I am happy to report that the 4BA bolts fitted perfectly.

Thank you everyone 👍

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