Page 150 - Michigan Drill

Interchangeable

Pilot Counterbores

High Speed Steel
COUNTERBORES 4-Flute Aircraft Short Series
For use with interchangeable Pilots
Used to enlarge the openings of a hole to allow room for the head
of a screw. Also for general purpose counterboring and spot facing.

List No. 503 – 1/4" straight shank
Price
Pilot
Price
Size
Size
Each
Length
Hole
Length
Each
3/32
1/4
3-1/8
3/16
2-3/8
11/16
3/16
53.44
3-1/8
2-3/8
35.72
9/32 Pilot Overall 35.72 21/32 Hole Overall 50.84
3/32
5/16 3/32 2-3/8 35.72 23/32 3/16 3-1/8 56.25
11/32 3/32 2-3/8 36.49 3/4 3/16 3-1/8 56.25
3/8 3/32 2-3/8 36.49 25/32 3/16 3-1/8 62.38
13/32 1/8 2-13/16 39.11 13/16 3/16 3-1/8 62.38
7/16 1/8 2-13/16 39.11 27/32 3/16 3-1/8 66.33
15/32 1/8 2-13/16 40.17 7/8 3/16 3-1/8 66.33
1/2 1/8 2-13/16 40.66 29/32 3/16 3-1/8 70.34
17/32 1/8 2-13/16 41.18 15/16 3/16 3-1/8 70.34
9/16 1/8 2-13/16 41.71 31/32 3/16 3-1/8 73.72
19/32 1/8 2-13/16 48.23 1 3/16 3-1/8 73.72
5/8 1/8 2-13/16 48.23
4-Flute Aircraft Long Series
List No. 504 – 1/2" or smaller straight shank
Shank Pilot Overall Price Shank Pilot Overall Price
Size Size
Diameter Hole Length Each Diameter Hole Length Each
1/4 15/64 3/32 4 39.08 25/32 1/2 3/16 5-3/8 72.17
9/32 17/64 3/32 4 39.06 13/16 1/2 3/16 5-3/8 72.17
5/16 19/64 3/32 4 41.71 27/32 1/2 3/16 5-3/8 85.00
11/32 5/16 3/32 4 43.70 7/8 1/2 3/16 5-3/8 79.36
3/8 5/16 3/32 4 44.22 29/32 1/2 3/16 5-3/8 102.00
13/32 3/8 1/8 4 45.04 15/16 1/2 3/16 5-3/8 94.67
7/16 3/8 1/8 4 46.82 31/32 1/2 3/16 5-3/8 102.00
15/32 7/16 1/8 4-1/4 46.82 1 1/2 3/16 5-3/8 94.67
1/2 7/16 1/8 4-1/4 49.78 1-1/16 1/2 3/16 5-1/2 111.96
17/32 1/2 1/8 4-1/4 49.78 1-1/8 1/2 3/16 5-1/2 113.69
9/16 1/2 1/8 4-1/4 52.13 1-3/16 1/2 3/16 5-1/2 126.57
19/32 1/2 1/8 4-1/4 54.75 1-1/4 1/2 1/4 5-1/2 136.10
5/8 1/2 1/8 4-1/4 55.47 1-5/16 1/2 1/4 5-1/2 153.80
21/32 1/2 3/16 5-3/8 58.08 1-3/8 1/2 1/4 5-1/2 158.64
11/16 1/2 3/16 5-3/8 59.24 1-7/16 1/2 1/4 5-1/2 163.18
23/32 1/2 3/16 5-3/8 66.43 1-1/2 1/2 1/4 5-1/2 163.18
3/4 1/2 3/16 5-3/8 68.64 1-3/4 1/2 1/4 5-1/2 215.00
Carbide Tipped
List No. CT500 – Straight Shank
List No. CT501 – Taper Shank Price Each Price Each
Minimum Pilot Shank No. of Overall Straight Shank Morse Taper Shank
Size
Cut Hole Diameter Flutes Length CT500 Taper No. CT501
1/4 .1140 3/32 15/64 3 3-13/16 102.87 1 102.87
5/16 .1140 3/32 19/64 3 3-13/16 112.52 1 112.52
3/8 .1820 5/32 5/16 3 4-1/16 116.11 1 116.11
7/16 .1820 5/32 3/8 3 4-1/16 119.30 1 119.30
1/2 .2280 3/16 7/16 3 4-5/16 131.66 1 131.66
9/16 .2280 3/16 1/2 3 4-5/16 134.13 1 134.13
5/8 .2280 3/16 1/2 3 5-1/8 137.72 2 137.72
11/16 .2280 3/16 1/2 3 5-1/8 145.30 2 145.30
3/4 .2900 1/4 1/2 3 5-3/8 147.77 2 147.77
13/16 .2900 1/4 5/8 3 5-3/8 150.40 2 150.40
7/8 .2900 1/4 3/4 3 5-3/8 158.06 2 158.06
15/16 .2900 1/4 3/4 3 6-1/8 162.37 3 162.37
1 .3530 5/16 3/4 3 6-3/8 166.11 2 169.89
1 .3530 5/16 3/4 3 6-3/8 — 3 169.89
1-1/16 .3530 5/16 3/4 3 6-3/8 168.27 3 174.65
1-1/8 .3530 5/16 1 3 6-3/8 173.61 3 180.15
Continued on Next Page 
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