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Keylocking Studs Installation / Removal

Easy Installation with Standard Drills and Taps

See chart below for tap, countersink and drill sizes.

1) Drill with a standard tap drill and countersink with a standard 82° - 100° countersink.

2) Tap new threads with a standard tap.

3) Screw in the stud end until it is .010-.030 below the surface. Keys locate the proper depth.

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:

  1. Cut the stud to be flush with the parent material
  2. Drill out material between the keys with a standard drill (drill bushing required) to specified depth
  3. Bend the keys inward and break off
  4. Remove the old stud using a screw extractor or similar device.
  5. Install a replacement stud into the original tapped hole and drive keys down.




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