Metal Backboxes For UK Sockets and Switches

A look at various sizes of metal backbox, which are used for flush mounting UK sockets, switches and other accessories into the wall.

Usual depths: 16mm, 25mm, 35mm, 47mm.
Screw thread size M3.5 x 0.6
Older screw size 1960s and earlier 4BA
Knockout holes typically 20mm diameter, some may be 25 on deeper boxes.

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