Ring magnets (32)
Ring magnets are neodymium magnets with a hole in the middle, available from Ø6 to Ø42 mm. With a straight hole, you can mount them on a bolt, pin, rod or shaft; with a countersunk hole, you can screw them flush into wood, plastic or metal. Ring magnets with countersunk holes are available in north-pole and south-pole versions: if you want two magnets to snap together, choose one of each.
Which ring magnet should you choose?
First, choose the hole: straight for sliding onto a pin, shaft or bolt, or countersunk for screwing flush. Both are available in small and large sizes. Then choose the size:
| Application | Suitable size | Example |
|---|---|---|
| Model making, sensors, small latches | Ø6 to Ø10 mm | small rings with straight or countersunk hole |
| Light doors, flaps and displays | Ø12 to Ø15 mm | Ø14 mm with countersunk hole (4 mm screw) |
| Cabinet doors, flaps, interior design | Ø17.5 to Ø20 mm | Ø20 mm with countersunk hole (5 mm screw) |
| Outside or in a damp area | Ø10 to Ø20 mm | epoxy or plastic coated |
| Heavier applications, workshop and clamping | Ø25 to Ø42 mm | large ring magnets |
Applications
- Latches for doors and flaps
- Assembly and fastening applications
- Displays and interior design
- Sensors and electronics
- Workshop and clamping
- Damp environment: epoxy or plastic coated
Unsure about the size? Read Which ring magnet should you choose?, How do you mount a magnet? or use the Magnet Advisor. Looking for a magnet without a hole? Check out the disc magnets and block magnets; for more holding force with one screw, choose the pot magnets with countersunk holes.
The stated holding force is measured under ideal conditions on a flat steel plate; in practice, the actual holding force is lower. Read how holding force is determined.
Frequently asked questions
North pole or south pole: which do I need?
With a ring magnet with a countersunk hole, the pole on the countersunk side is fixed. If you want two magnets to snap together, for example in a door and its frame, take one north-pole and one south-pole version. Two identical versions will repel each other. If the magnet is used against steel, the pole does not matter.
Can I use just one magnet?
Yes: screw a steel ring with a countersunk hole on the other side as a counterpart. Then the pole does not matter and it is often cheaper.
Which screw fits?
A screw with a flat countersunk head, such as a wood screw, metric screw or sheet metal screw. The correct screw size is listed in the specifications for each ring magnet.
How tightly should I tighten the screw?
Just tight enough, no more. Neodymium is hard and brittle: overtightening can cause the magnet to crack. Preferably use a screwdriver instead of a drill on high speed.
What is the difference between a straight hole and a countersunk hole?
A straight hole has the same width throughout: convenient for sliding the magnet onto a pin, shaft, rod or bolt. A countersunk hole tapers, so the head of a flat countersunk screw sits flush with the magnet. Both versions are available in small and large sizes.
Can I use ring magnets outdoors?
The standard NiCuNi coating is intended for dry indoor use. For outdoor or damp conditions, choose an epoxy coated or plastic coated ring magnet. For example, read how a customer made a removable outdoor grille.
How do I order ring magnets for a series of furniture or displays?
Order the north- and south-pole versions in equal quantities, or combine each magnet with a steel ring. Volume discounts apply to larger quantities, and as a business, you can order on account or request a quote for a project. Business ordering.
When will my order be shipped?
Orders placed and paid for before 16:00 on working days are shipped the same day if in stock. Free shipping within the Netherlands from €45. Consumers have a 30-day cooling-off period.
