Tronic 4BA Screw for Switch Pattress and Switchbox Fastening

Our review

This Tronic 4BA screw is a small fastening component intended for attaching switches to a pattress or switchbox. It is the sort of item an electrician reaches for during accessory installation, and it also suits anyone replacing or refitting a wall switch at home who wants the correct thread rather than a substitute that may not seat properly. The listed thread count of 38.5 threads per inch and a 3.0mm tap drill diameter are the details worth noting, since they tell you the screw follows the 4BA thread standard and that a 3.0mm hole is the matching drill size if you are tapping or clearing a fixing point. Before buying, confirm your switch plate or box uses 4BA threads, because metric machine screws will not interchange with it. Check the length you need for your pattress depth, as that is not stated here. Compare against other 4BA screws on thread count, material and finish, and against metric alternatives only if your hardware accepts them. A one-year warranty is listed.