Easy Installation with Standard Drills and
Taps
See chart below for tap, countersink and drill sizes. |
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1) Drill with a standard tap drill and countersink with a standard 82° - 100° countersink. |
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2) Tap new threads with a standard tap. |
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3) Screw in the stud end until it is .010-.030 below
the surface. Keys locate the proper depth. |
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4) Drive keys down with several hammer taps on the proper installation tool. |
Stud End Thread Size
Class 2A (Mod Minor Dia.) |
Tap Drill Size
0.003
-0.001 |
Tap Drill Hole Tolerance |
C'Sink Dia.
+.010
-.000 |
Removal Drill |
| Size |
Depth |
| 5/16-18 |
.272 |
.004/-.001 |
.323 |
7/32 |
1/8 |
| 3/8-16 |
.332 |
.004/-.001 |
.385 |
9/32 |
1/8 |
| 7/16-14 |
.397 |
.004/-.001 |
.447 |
11/32 |
3/16 |
| 1/2-13 |
.453 |
.004/-.001 |
.510 |
13/32 |
3/16 |
| 9/16-12 |
.516 |
.005/-.001 |
.572 |
15/32 |
3/16 |
| 5/8-11 |
.578 |
.005/-.001 |
.635 |
17/32 |
3/16 |
| 11/16-11 |
.641 |
.005/-.001 |
.700 |
19/32 |
3/16 |
| 13/16-16 |
.766 |
.005/-.001 |
.822 |
23/32 |
3/16 |
| 7/8-14 |
.828 |
.005/-.001 |
.885 |
25/32 |
3/16 |
| 1-1/8-12 |
1.062 |
.005/-.001 |
1.145 |
31/32 |
5/16 |
| 1-1/4-12 |
1.187 |
.005/-.001 |
1.270 |
1-3/32 |
5/16 |
| 1-3/8-12 |
1.312 |
.005/-.001 |
1.395 |
1-7/32 |
5/16 |
Drill with a standard tap drill and countersink with a standard 82° - 100° countersink
Note: Drill is oversize, see chart for proper dimensions |
Removal of Keylocking Studs
If necessary, Acme keylocking studs can be removed without damage to the
parent material:
- Cut the stud to be flush with the parent material
- Drill out material between the keys with a standard drill (drill bushing
required) to specified depth
- Bend the keys inward and break off
- Remove the old stud using a screw extractor or similar device.
- Install a replacement stud into the original tapped hole and drive keys
down.
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