99K3251 - 3/8" Cup for 1/4" Magnet
Outside Diameter:
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Magnet cups increase a magnet’s attraction, usually by a factor of four. These zinc-plated steel cups are counterbored to fit the rare-earth magnets we sell. The cup for the 1/4" magnet has a ridged outer surface for a press fit into a 3/8" × 1/4" deep hole. The larger cups can be screwed directly to the face of the workpiece or flush mounted in a counterbored hole. The 1/2" and 5/8" cups are 1/4" thick and countersunk for a #4 flat-head screw; the 7/8" and 1 1/8" cups are 9/32" thick and countersunk for a #10 screw (to restrain the larger magnets' greater attraction). No glue is needed; once set in the cup, the magnet has little chance of popping out. To allow future removal of the magnet or cup, first file a slot in the side walls for an access point to pry out the magnet. Sizes stated are the outside diameter.
Sold individually. Made in Canada.
Steel cups typically increase a magnet's attraction by a factor of four by focusing the magnetic field in one direction. The improvement depends on the magnet size and the specific application, but a fourfold increase is the general expectation.
No. Once pressed into the counterbored cup, the magnet seats securely with little chance of popping out. To allow future removal, you can file a slot in the side wall of the cup as an access point for prying the magnet out.
The 3/8" cup (for a 1/4" magnet) has a ridged outer surface designed for press-fitting into a 3/8" × 1/4" deep hole drilled in the workpiece. No screws are required.
Cups of 1/2" and 5/8" O.D. are 1/4" thick and countersunk for a #4 flat-head screw. The 7/8" and 1 1/8" cups are 9/32" thick and countersunk for a #10 screw. They can also be flush-mounted in a counterbored hole if a recessed installation is preferred.
No. Cups are available individually without magnets. The corresponding rare-earth magnets are available separately. Sets of magnets, cups and washers are also available.
| Materials | Zinc-plated steel |
| Dimensions | 3/8" OD (1/4" magnet); 1/2" OD (3/8" magnet); 5/8" OD (1/2" magnet); 3/4" OD (5/8" magnet); 7/8" OD (3/4" magnet); 1 1/8" OD (1" magnet) |
| Package Quantity | 1 item |
| Warranty | Lee Valley Satisfaction Guarantee |
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Outside Diameter
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Steel Cups for Rare-Earth Magnets
Magnet cups increase a magnet’s attraction, usually by a factor of four. These zinc-plated steel cups are counterbored to fit the rare-earth magnets we sell. The cup for the 1/4" magnet has a ridged outer surface for a press fit into a 3/8" × 1/4" deep hole. The larger cups can be screwed directly to the face of the workpiece or flush mounted in a counterbored hole. The 1/2" and 5/8" cups are 1/4" thick and countersunk for a #4 flat-head screw; the 7/8" and 1 1/8" cups are 9/32" thick and countersunk for a #10 screw (to restrain the larger magnets' greater attraction). No glue is needed; once set in the cup, the magnet has little chance of popping out. To allow future removal of the magnet or cup, first file a slot in the side walls for an access point to pry out the magnet. Sizes stated are the outside diameter.
Sold individually. Made in Canada.
