Drills-Taps-Reamers Chart

Drill Bits
For Taps or Holes
Reamers

3/64"

0 - 80 tap

#53

1 - 72 tap and 1/16" detent ball hole

1/16"

1 - 72 tap and for clearance drill for 0 - 80 screws

#50

2 - 56 tap

5/64" of #48

Clearance drill for 1 - 72 screws

#43

4 - 40 tap and for clearance drill for 2 - 56 screws

#41

Countersink for 0 - 80 socket head

#31

Countersink for 1 - 72 socket head and clearance drill for 4 - 40 screws

1/8"

9/64"

Countersink for 2 - 56 socket head

# 13

Hole

3/16"

# 1

Hole

1/4"

NR.
Counterbores   (from R. B. Johnson)
 

Handle Screws

 
#0
for 0-80 Button and Pan Head Screws
#1
for 1-72 Button and Pan Head Screws
 

Pivot Pin Screws

 
#2
for 2-56 Button Head Screws 1/8" pilot for 1/8" pivot
#4
4 for 4-40 Button Head Screws 3/16" pilot for 3/16" pivot

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