Epoxy Coated Magnets in Steel Doors
For steel doors and frames, choose thin black epoxy block magnets such as 30 x 10 x 2.5 mm or 80 x 20 x 3.9 mm. The black coating blends into the profile and protects better against moisture than nickel. With sizes, holding force and mounting tips.
Short answer: for steel(-look) doors, frames and pivot doors, use thin black epoxy block magnets that fit in or on the profile, for example 30 x 10 x 2.5 mm for a light closure or 80 x 20 x 3.9 mm for a heavy door. The black coating blends in against a black profile and is more resistant to moisture and condensation than an ordinary nickel coating. On a steel frame you do not need a counter magnet; on aluminium or wood you need a steel strip or a second magnet.
Which magnet suits which door?
| Application | Advice |
|---|---|
| Light interior door or cabinet door in steel look | block magnet 30 x 10 x 2.5 mm N48 epoxy (also as a set of 4) |
| Narrow profiles | 30 x 12 x 2 mm N48 epoxy or 30 x 15 x 2 mm N42 epoxy |
| Heavy steel door or pivot door | 80 x 20 x 3.9 mm N35 epoxy or 80 x 20 x 2 mm N40 epoxy |
| Screwing into the profile | ring magnet Ø20 mm epoxy with countersunk hole (north and south pole) |
All versions are in the epoxy magnets.
Why epoxy?
- Discreet: matt black, matches black powder-coated steel.
- More moisture-resistant: better against condensation on exterior doors and in bathrooms than NiCuNi. See why do neodymium magnets have a coating?
- No nickel on the outside.
Mounting tips
- Glue the magnet with two-component epoxy into a recess in the profile. See how do you mount a magnet?
- Leave 0.5 – 1 mm of play between magnet and counter plate if the door must not jam; this does reduce the force. See force at a distance.
- A thin block magnet on a 1.5 – 2 mm steel frame does not reach its full holding force: so choose two magnets rather than one large one.
- Test the closing force before gluing permanently: too strong closes hard and can make the door bounce back.
Frequently asked questions
Does a magnet work on an aluminium frame?
No, aluminium is not magnetic. Use two magnets (north and south) or a steel counter plate.
Can an epoxy magnet be used outdoors?
Under a canopy yes; in direct rain choose a plastic-coated magnet. See can magnets be used outdoors?
Read also
- Which block magnet should you choose?
- Which coating or finish should you choose?
- Magnets for interior construction
Need help? Use the Magnet Advisor or contact us.
