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DIAMETER

LENGTH OVER-ALL (lNCHES)

 SHANK SIZE AND LENGTH FLUTES

PILOT HOLE (INCHES)
3/16 3 15/64 X 21/2 4 3/32
7/32 3 15/64 X 21/2 4 3/32
1/4 3 3/4 15/64 X 31/16 4 3/32
9/32 3 3/4 17/64 X 31/8 4 3/32
5/16 3 3/4 19/64 X 31/8 4 3/32
11/32 3 3/4 5/16 X 31/8 4 3/32
3/8 3 3/4 5/16 X 31/8 4 3/32
13/32 4 1/8 5/16 X 3 4 1/8
7/16 4 1/8 5/16 X 3 4 1/8
15/32 4 1/8 7/16 X 3 4 1/8
1/2 4 1/8 7/16 X 3 4 1/8
17/32 4 1/4 7/16 X 3 4 5/32
9/16 4 1/4 7/16 X 3 4 5/32
19/32 4 1/4 1/2 X 3 4 5/32
5/8 4 1/4 1/2 X 3 4 5/32
21/32 5 3/8 1/2 X 4 4 3/16
11/16 5 3/8 1/2 X 4 4 3/16
23/32 5 3/8 1/2 X 4 4 3/16
3/4 5 3/8 1/2 X 4 4 3/16
25/32 5 3/8 1/2 X 4 4 3/16
13/16 5 3/8 1/2 X 4 4 3/16
7/8 5 3/8 1/2 X 4 4 3/16
15/16 5 3/8 1/2 X 4 4 3/16
1 5 3/8 1/2 X 4- 4 3/16
1 1/16 5 1/2 3/4 X 4 4 5/16
1 1/18 5 1/2 3/4 X 4 4 5/16
1 3/16 5 1/2 3/4 X 4 4 5/16
1 1/4 5 1/2 3/4 X 4 4 5/16
1 5/16 5 1/2 3/4 X 4 4 5/16
1 3/8 5 1/2 3/4 X 4 4 5/16
1 7/16 5 1/2 3/4 X 4 4 5/16
1 1/2 5 1/2 3/4 X 4 4 5/16

AIRCRAFT COUNTERBORES OR SPOTFACERS

LONG SERIES

LONG SET - FOUR FLUTE
HIGH SPEED - STRAIGHT SHANK Interchangeable Pilots
CATALOG No. CA4014

To meet special conditions in the Aircraft Industry, these Counterbores have pilot holes smaller than standard and are especially useful for deep counterboring screw heads and spring pockets.
All counterbores are made of finest H. S. Steel available. Shanks are hardened and ground, assuring long life and concentric operation.
Furnished without radius unless specified.

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