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", 5/8" and 3/4" 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
Variations:
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", 5/8" and 3/4" 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.
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.
