Light Switch faceplate screws

[omph]

Does anyone know what type of screws are used for 1 gang light switch faceplates ? Are they M3.5 or m4 ?

 

[RandomGrinch]

Are they M3.5

Yup!

 

[omph]

How old is it? Before around 1970 they were 4BA.

1990

 

[SUNRAY]

No I remember M3.5 screws in the 80's.

I think I'd go for 70's

 

[ebee]

screw threads do not often seem to know the difference between the SI and imperial ones of those sizes either, they just don`t care usually. Just run a tap down it if it needs it (A tap sold with a handle attached is sometimes known as a re-threader)

 

[RandomGrinch]

A tap sold with a handle attached is sometimes known as a re-threader

A lovely tool for the toolbox!

Forge Steel Re-Threader M3.5 x 0.6mm - Screwfix

Order online at Screwfix.com. Used to clean and recut damaged or worn threads in socket boxes. Can also be used for other similar jobs such as restoring stripped threads. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

 

[securespark]

The 14th Ed. of the regulations went metric in 1970, so there would have been a switch from 4BA to M3.5 screws.

4BA equates to approximately 3.6mm. I often find the metric screw does not tighten up in an imperial box.

 

[SUNRAY]

The 14th Ed. of the regulations went metric in 1970, so there would have been a switch from 4BA to M3.5 screws.

4BA equates to approximately 3.6mm. I often find the metric screw does not tighten up in an imperial box.

Date sounds good to me.

I made some 8 way socket boards about 1972-3 consisting of 4 DSO in a 2x1! timber frame. back boxes were imperial sockets were metric screws and no they didn't grip.