Product Description
N52 countersunk magnets, 20mm x 3mm (SKU: MAGNET-RING-20MMX3MM) are strong neodymium discs with a pre-drilled, countersunk hole so you can screw them flat to a surface rather than relying on glue alone.
What they're actually for
If you install or maintain CCTV kit, this size and format is commonly used for:
- Temporarily mounting small sensors, PIR units, or junction box lids where you need a secure but removable fixing
- Holding cable tidy plates or covert camera housings to steel brackets and poles
- General DIY and workshop jobs needing a compact, screw-fixed magnet rather than an adhesive pad
Why the countersunk hole matters
A plain magnet disc can only be stuck down with adhesive, which weakens over time — especially outdoors or in a warm loft space near cabling. The countersunk hole lets you drive a screw through the centre, so the fixing holds mechanically as well as magnetically. That's the practical difference worth knowing before you buy: check your mounting screw will sit flush in the countersink, and confirm the surface you're attaching to is actually magnetic (steel, not aluminium or plastic housings).
N52 refers to the magnetic grade — it's one of the stronger neodymium grades commonly available, which is why these are described as high-strength.
At 20mm diameter and 3mm thick, this is a compact size suited to small fixings rather than heavy load-bearing use.
Technical Specifications
Frequently Asked Questions
What does the countersunk hole let me do?
It lets you drive a screw through the centre of the magnet so it's held both magnetically and mechanically, rather than relying on adhesive alone.
Will these stick to any surface?
No — they only grip magnetic materials such as steel. They won't hold on aluminium, plastic, or other non-magnetic housings.
What does N52 mean?
N52 is the magnetic grade of the neodymium used, indicating a stronger pull compared with lower grades commonly sold for the same size.
Are these strong enough for heavy CCTV brackets?
At 20mm x 3mm they're a compact size best suited to small fixings and lighter mounting jobs rather than heavy load-bearing brackets.
