Q: What sizes are available?
The sets come in four cup diameters, 5/8", 3/4", 1" and 1 1/4", each rated for a different pull force so holding strength can be matched to the job.
99K3904 - 5/8" Cupped Magnet Set
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This design of rare-earth cupped magnet is strong, easy to install and comes as a three-piece set of integral magnet with cup, countersunk washer (for use as a door strike), and high-friction disc.
The magnet can be used as a door catch with a strike or as a magnetic base alone with high-friction film cover but without the strike. The countersunk screw hole in the center of the magnet makes it particularly easy to install or remove. The cups are about 0.005" smaller than their nominal diameters so they fit snugly in a counterbored hole. For many shop uses, they can be attached directly to walls, beams or equipment without any counterbore.
The magnet strengths listed are rated as the average pounds of force required in a straight pull to disengage them from 3/8" thick steel or their companion washers. Recommended sizes of flat-head wood screws (not included) are listed.
The sets come in four cup diameters, 5/8", 3/4", 1" and 1 1/4", each rated for a different pull force so holding strength can be matched to the job.
Yes, the magnet doubles as a standalone mount; add the high-friction disc to its face to keep it from slipping against a bare steel surface.
Countersink the magnet's screw hole into the hole using a flat-head wood screw sized to the cup diameter, and the cup will sit flush with the surface.
Recommended flat-head wood screw sizes range from #4 for the smallest cup up to #10 for the largest, though the screws themselves are not included.
Yes, adding the disc slightly reduces the attractive force between the magnet and washer, though it's needed in most applications to prevent slipping.
Yes, a set of four cupped magnets on a toolbox base will anchor it to a flat metal panel on a truck bed, tractor fender or similar equipment.
No, keep the magnets away from electronic devices and anything that stores data magnetically, since the strong field can corrupt or erase it.
| Materials | Rare-earth magnet; steel washer |
| Dimensions | 5/8" cup diameter; 3/4" cup diameter; 1" cup diameter; 1 1/4" cup diameter |
| Capacity | Maximum 12 lb to 69 lb pull force (from 3/8" thick steel), depending on cup size |
| Includes | Cupped magnet; countersunk washer; high-friction disc |
| Package Quantity | 1 set |
| Safety | Small parts pose a choking hazard; not for children under eight. May corrupt data stored on nearby magnetic media. |
| Warranty | Lee Valley Satisfaction Guarantee |
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Variations:
Cupped Magnet Sets
This design of rare-earth cupped magnet is strong, easy to install and comes as a three-piece set of integral magnet with cup, countersunk washer (for use as a door strike), and high-friction disc.
The magnet can be used as a door catch with a strike or as a magnetic base alone with high-friction film cover but without the strike. The countersunk screw hole in the center of the magnet makes it particularly easy to install or remove. The cups are about 0.005" smaller than their nominal diameters so they fit snugly in a counterbored hole. For many shop uses, they can be attached directly to walls, beams or equipment without any counterbore.
The magnet strengths listed are rated as the average pounds of force required in a straight pull to disengage them from 3/8" thick steel or their companion washers. Recommended sizes of flat-head wood screws (not included) are listed.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.
