855 SERIES pilots are designed for use with 848 Series and 850 Series aircraft counterbores. Will fit almost all standard aircraft counterbores. Made from finest quality tool steel,heat treated throughout and precision ground to exacting size and concentricity tolerances.

TOOL NUMBER
PILOT HEAD NOMINAL DIA.
STANDARD SHANK DIAMETERS
3/32
1/8
5/32
3/16
1/4
5/16
855-1
3/32 (.093)
*
 
 
 
 
 
855-2
1/8 (.125)
*
*
 
 
 
 
855-3
5/32 (.156)
*
*
*
 
 
 
855-4
#20 (.161)
*
*
*
 
 
 
855-5
3/16 (.187)
*
*
*
*
 
 
855-6
#10(.193)
*
*
*
*
 
 
855-7
7/32 (.218)
*
*
*
*
 
 
855-8
1/4 (.250)
*
*
*
*
*
 
855-9
"F" (.257)
*
*
*
*
*
 
855-10
9/32 (.281)
 
*
*
*
*
 
855-11
5/16 (.312)
 
*
*
*
*
*
855-12
11/32 (.343)
 
 
*
*
*
*
855-13
3/8 (.375)
 
 
*
*
*
*
855-14
13/32 (.406)
 
 
*
*
*
*
855-15
7/16 (.437)
 
 
*
*
*
*
855-16
15/32 (.468)
 
 
*
*
*
*
855-17
1/2 (.500)
 
 
*
*
*
*
855-18
17/32 (.531)
 
 
 
*
*
*
855-19
9/16 (.562)
 
 
 
*
*
*
855-20
19/32 (.593)
 
 
 
*
*
*
855-21
5/8 (.625)
 
 
 
*
*
*
855-22
21/32 (.656)
 
 
 
 
*
*
855-23
11/16 (.687)
 
 
 
 
*
*
855-24
23/32 (.718)
 
 
 
 
*
*
855-25
3/4 (.750)
 
 
 
 
*
*
855-26
25/32 (.781)
 
 
 
 
 
*
855-27
13/16 (.812)
 
 
 
 
 
*
855-28
7/8 (.875)
 
 
 
 
 
*
855-29
15/16 (.937)
 
 
 
 
 
*
855-30
1 (1.000)
 
 
 
 
 
*

When ordering please specify: Tool number and standard shank diameter. Example: 855-7-1/8.

* Denotes standard sizes.

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