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Screws

The right fixings make wiring accessories sit flush and secure. These M3.5 countersunk electrical screws from Knightsbridge come in raised and flat head, in 35mm, 50mm and 75mm lengths to suit different back box depths, finished in nickel, brass and black to match your plates. White screw cap covers are here too, supplied in packs of 100 for whole jobs.

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Electrical Screws and Fixings for a Flush Finish

The right fixings are what make a wiring accessory sit flush and stay secure, and the wrong length leaves a plate proud or a screw bottoming out before it tightens. This range covers M3.5 countersunk electrical screws, the standard thread for fixing faceplates and accessories to back boxes, supplied in packs of 100 for whole jobs rather than one socket at a time. With a box to hand you are not held up hunting for a single screw partway through fitting out a room.

Both head types are here. Raised head countersunk screws sit slightly proud with a domed top for a neater look on the plate, while flat head countersunk screws finish level with the surface. Lengths run from 35mm through 50mm to 75mm, so you can match the screw to the depth of the back box behind the plate; a deeper box needs a longer screw to reach the lugs, while a shallow box takes a shorter one. Choosing the right length means the plate pulls up tight without the screw running out of thread or sitting too far in.

Finishes cover nickel, brass and black, letting the screw heads blend with the plates rather than standing out against them, and white screw cap covers are offered to cap the heads for a tidy, finished face. Pick the head style for the look you want, the length to suit the box, and a finish to match the accessory. Free UK delivery over £99, with worldwide shipping available.

Frequently Asked Questions

What length screw do I need?
It depends on the depth of the back box behind the plate. These M3.5 screws come in 35mm, 50mm and 75mm lengths: a deeper box needs a longer screw to reach its fixing lugs, while a shallow box takes a shorter one. Matching the length lets the plate pull up tight without the thread running out.

What is the difference between raised head and flat head?
A flat head countersunk screw finishes level with the surface of the plate, while a raised head countersunk screw sits slightly proud with a domed top for a neater appearance. Both are countersunk to seat into the plate; the choice is down to the look you prefer.

What finishes are available?
The screws come in nickel, brass and black, so you can match the head to the accessory rather than have it stand out. White screw cap covers are also offered to cap the heads for a clean, finished face on the plate.

Why are they sold in packs of 100?
The screws are supplied in packs of 100 so you have plenty for a whole job, fitting out a room or a property in one go rather than buying a couple at a time. It means you are not stopped mid-job for the sake of a single missing screw.

What are M3.5 screws used for?
M3.5 is the standard thread used to fix wiring accessory faceplates and similar fittings to their back boxes. These countersunk versions seat neatly so the plate sits flush, and the screw caps tidy the heads once everything is in place.

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