Page 75 - Michigan Drill

3/4" Reduced Shank Drills

High Speed Steel & Cobalt
All Sizes 6" overall with 3" flute length
Boring Mill & Screw Machine
List No. 306 – High Speed Steel, 118° Point
List No. 306C – Cobalt, 135° Notched Point
Price Each Price Each HOLE MAKING
Decimal H.S. Cobalt Decimal H.S. Cobalt
Size Size
Equivalent 306 306C Equivalent 306 306C
25/32 .7812 50.74 74.25 1-1/4 1.2500 114.40 202.68
13/16 .8125 53.17 77.13 1-17/64 1.2656 141.50 ––
53/64 .8281 62.92 –– 1-9/32 1.2812 128.64 281.03
27/32 .8438 57.20 81.63 1-19/64 1.2968 147.07 ––
55/64 .8594 65.13 –– 1-5/16 1.3125 133.70 281.03
7/8 .8750 59.21 84.96 1-11/32 1.3438 142.50 283.50
57/64 .8906 67.23 –– 1-3/8 1.3750 148.03 283.50
29/32 .9062 61.12 92.88 1-13/32 1.4062 156.40 306.27
59/64 .9219 72.06 –– 1-7/16 1.4375 164.96 306.27
15/16 .9375 65.51 99.45 1-15/32 1.4688 171.83 315.54
61/64 .9531 74.83 –– 1-1/2 1.5000 194.39 315.54
31/32 .9688 68.03 105.03 1-17/32 1.5312 213.05 ––
63/64 .9844 76.41 –– 1-9/16 1.5625 208.43 346.50
1 1.0000 69.51 109.08 1-19/32 1.5938 247.84 ––
1-1/64 1.0156 91.48 –– 1-5/8 1.6250 231.75 387.00
1-1/32 1.0312 83.16 140.04 1-21/32 1.6562 283.55 ––
1-3/64 1.0469 91.48 –– 1-11/16 1.6875 265.84 394.34
1-1/16 1.0625 83.16 148.62 1-23/32 1.7188 294.16 ––
1-5/64 1.0781 97.53 –– 1-3/4 1.7500 268.72 449.91
1-3/32 1.0938 88.66 160.74 1-25/32 1.7812 319.91 ––
1-7/64 1.1094 102.02 –– 1-13/16 1.8125 301.16 494.82
1-1/8 1.1250 92.74 166.61 1-27/32 1.8438 327.61 ––
1-9/64 1.1406 103.97 –– 1-7/8 1.8750 307.65 517.29
1-5/32 1.1562 94.52 173.00 1-29/32 1.9062 343.75 ––
1-11/64 1.1719 114.14 –– 1-15/16 1.9375 323.30 539.72
1-3/16 1.1875 103.76 189.05 1-31/32 1.9688 366.36 ––
1-13/64 1.2031 123.40 –– 1-63/64 1.9844 366.36 ––
1-7/32 1.2188 112.18 193.86 2 2.0000 335.54 575.64
1-15/64 1.2344 125.84 –– 2-3/8 2.3750 375.00 ––

3/4" Shank Sets
Sizes Description Pieces Set No. Price
1", 1-1/8, 1-1/4, 1-3/8, 1-1/2 H.S. 3/4" Shank 5 306A 562.50
1", 1-1/4, 1-1/2, 1-3/4, 2" H.S. 3/4" Shank 5 306B 989.54
1", 1-1/8, 1-1/4, 1-3/8, 1-1/2 Cobalt 3/4" Shank 5 306D 1084.39
1", 1-1/4, 1-1/2, 1-3/4, 2" Cobalt 3/4" Shank 5 306E 1665.81
All sets are supplied in wood block

Maintenance 3/4" Shank All Sizes 6" overall with 3" flute length
List No. X306 – High Speed Steel, 118° Point
Decimal Price Decimal Price Decimal Price
Size Size Size
Equivalent Each Equivalent Each Equivalent Each
25/32 .7812 19.53 1-7/32 1.2188 45.55 1-39/64 1.6094 115.00
13/16 .8125 21.14 1-1/4 1.2500 52.85 1-5/8 1.6250 99.38
27/32 .8438 21.14 1-17/64 1.2656 65.00 1-21/32 1.6562 108.50
7/8 .8750 23.52 1-9/32 1.2812 57.85 1-43/64 1.6719 137.00
29/32 .9062 23.87 1-5/16 1.3125 58.73 1-11/16 1.6875 110.00
15/16 .9375 26.25 1-11/32 1.3438 65.52 1-45/64 1.7031 138.00
31/32 .9688 27.55 1-23/64 1.3594 79.00 1-23/32 1.7188 116.69
1 1.0000 29.54 1-3/8 1.3750 66.43 1-3/4 1.7500 118.00
1-1/32 1.0312 36.05 1-13/32 1.4062 72.80 1-25/32 1.7812 124.32
1-1/16 1.0625 37.09 1-7/16 1.4375 73.29 1-13/16 1.8125 138.88
1-3/32 1.0938 38.99 1-29/64 1.4531 92.00 1-27/32 1.8438 129.43
1-7/64 1.1094 42.50 1-15/32 1.4688 77.77 1-7/8 1.8750 130.59
1-1/8 1.1250 39.22 1-1/2 1.5000 80.07 1-29/32 1.9062 140.07
1-5/32 1.1562 41.86 1-17/32 1.5312 93.59 1-15/16 1.9375 142.00
1-3/16 1.1875 41.86 1-9/16 1.5625 95.57 1-31/32 1.9688 145.53
1-13/64 1.2031 69.00 1-19/32 1.5938 97.02 2 2.0000 155.00
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