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 |
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1+ |
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10+ |
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| A. |
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5/8" Cupped Magnet Set
99K39.04     |
|
$3.80 |
|
$3.00 |
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| B. |
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3/4" Cupped Magnet Set
99K39.05   |
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$4.80 |
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$3.80 |
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| C. |
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1" Cupped Magnet Set
99K39.07 |
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$6.10 |
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$4.85 |
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| D. |
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1-1/4" Cupped Magnet Set
99K39.09 |
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$7.40 |
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$5.90 |
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