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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 in the chart below 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 in the chart.

  Product # Cup Dia. Magnet Dia. Screw Size 3/8" Plate Force Washer Force
A. 99K39.04 5/8" 12mm (1/2") #4, 5, 6 12 lb 9 lb
B. 99K39.05 3/4" 14mm (9/16") #6 16-1/2 lb 15 lb
C. 99K39.07 1" 18mm (11/16") #8 35 lb 32 lb
D. 99K39.09 1-1/4" 24mm (15/16") #10 69 lb 56 lb
1+ 10+
 
A.  5/8" Cupped Magnet Set
 99K39.04   Technical Information Instruction sheet
  $3.90   $3.10 Add to cartOnline: AvailableNo store selected - Click to select "My Store"
B.  3/4" Cupped Magnet Set
 99K39.05    
  $4.90   $3.90 Add to cartOnline: Limited quantitiesNo store selected - Click to select "My Store"
C.  1" Cupped Magnet Set
 99K39.07    
  $6.20   $4.95 Add to cartOnline: AvailableNo store selected - Click to select "My Store"
D.  1-1/4" Cupped Magnet Set
 99K39.09    
  $7.60   $6.05 Add to cartOnline: AvailableNo store selected - Click to select "My Store"

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