Page 99 - Michigan Drill

Core Drills

High Speed Steel – Oxide Finish
Taper Shank – 45° Chamfer End
List No. 521 – Three Flute
List No. 522 – Four Flute
Price Each Price Each
Dec. Flute Overall Morse 3 - Flute 4 - Flute Dec. Flute Overall Morse 3 - Flute 4 - Flute
Size Size HOLE MAKING
Equiv. Length Length Taper No. 521 522 Equiv. Length Length Taper No. 521 522
7/32 .2188 2-3/4 6 1 38.64 — 1-7/32 1.2188 7-1/2 13-1/8 4 208.23 197.45
1/4 .2500 2-7/8 6-1/8 1 38.64 36.30 1-15/64 1.2344 7-7/8 13-1/2 4 245.00 234.30
9/32 .2812 3 6-1/4 1 45.64 43.69 1-1/4 1.2500 7-7/8 13-1/2 4 227.70 223.48
19/64 .2969 3-1/8 6-3/8 1 52.07 52.07 1-17/64 1.2656 8-1/2 14-1/8 4 260.70 250.41
5/16 .3125 3-1/8 6-3/8 1 45.54 — 1-9/32 1.2812 8-1/2 14-1/8 4 254.36 238.15
21/64 .3281 3-1/4 6-1/2 1 53.46 53.46 1-5/16 1.3125 8-5/8 14-1/4 4 264.40 254.43
21/64 .3281 3-1/4 7-3/8 2 66.00 — 1-11/32 1.3438 8-3/4 13 3/8 3 — 285.00
R .3390 3-1/4 6-1/2 1 69.14 — 1-11/32 1.3438 8-3/4 14-3/8 4 271.85 263.63
11/32 .3438 3-1/4 6-1/2 1 47.39 — 1-23/64 1.3594 8-7/8 14-1/2 4 299.04 289.99
23/64 .3594 3-1/2 6-3/4 1 53.33 51.16 1-3/8 1.3750 8-7/8 14-1/2 4 290.99 278.12
3/8 .3750 3-1/2 6-3/4 1 47.62 45.92 1-25/64 1.3906 9 14-5/8 4 349.00 —
25/64 .3906 3-5/8 7 1 59.90 58.70 1-13/32 1.4062 9 14-5/8 4 303.80 291.05
13/32 .4062 3-5/8 7 1 54.19 52.36 1-27/64 1.4219 9-1/8 14-3/4 4 — 320.16
27/64 .4219 3-7/8 7-1/4 1 61.71 59.80 1-7/16 1.4375 9-1/8 14-3/4 4 313.90 303.14
7/16 .4375 3-7/8 7-1/4 1 59.50 54.47 1-29/64 1.4531 9-1/4 14-7/8 4 — 333.45
29/64 .4531 4-1/8 7-1/2 1 66.00 64.90 1-15/32 1.4688 9-1/4 14-7/8 4 329.48 314.03
15/32 .4688 4-1/8 7-1/2 1 60.80 55.52 1-1/2 1.5000 9-3/8 15 4 343.91 329.84
31/64 .4844 4-3/8 8-1/4 2 67.46 65.93 1-33/64 1.5156 9-3/8 16-3/8 5 — 419.10
1/2 .5000 4-3/8 8-1/4 2 56.73 46.20 1-17/32 1.5312 9-3/8 16-3/8 5 392.70 379.76
33/64 .5156 4-5/8 8-1/2 2 — 71.28 1-35/64 1.5469 9-5/8 16-5/8 5 425.70 419.10
17/32 .5312 4-5/8 8-1/2 2 64.83 58.61 1-9/16 1.5625 9-5/8 16-5/8 5 409.20 393.16
35/64 .5469 4-7/8 8-3/4 2 85.00 80.85 1-37/64 1.5781 9-7/8 16-7/8 5 — 463.98
9/16 .5625 4-7/8 8-3/4 2 69.50 65.67 1-19/32 1.5938 9-7/8 16-7/8 5 449.20 429.45
37/64 .5781 4-7/8 8-3/4 2 89.10 85.14 1-39/64 1.6094 10 17 5 482.00 475.86
19/32 .5938 4-7/8 8-3/4 2 79.75 72.21 1-5/8 1.6250 10 17 5 475.86 443.06
39/64 .6094 4-7/8 8-3/4 2 89.10 85.14 1-21/32 1.6562 10-1/8 17-1/8 5 485.10 470.25
5/8 .6250 4-7/8 8-3/4 2 82.72 76.45 1-43/64 1.6719 10-1/8 17-1/8 5 514.80 —
41/64 .6406 5-1/8 9 2 89.87 86.04 1-11/16 1.6875 10-1/8 17-1/8 5 501.71 487.85
21/32 .6562 5-1/8 9 2 86.04 78.78 1-45/64 1.7031 10-1/8 17-1/8 5 545.00 536.64
43/64 .6719 5-3/8 9-1/4 2 96.00 94.00 1-23/32 1.7188 10-1/8 17-1/8 5 505.69 489.19
11/16 .6875 5-3/8 9-1/4 2 87.38 82.10 1-47/64 1.7344 10-1/8 17-1/8 5 527.34 522.00
45/64 .7031 5-5/8 9-1/2 2 98.60 92.40 1-3/4 1.7500 10-1/8 17-1/8 5 530.00 518.68
23/32 .7188 5-5/8 9-1/2 2 92.12 87.81 1-49/64 1.7656 10-1/8 17-1/8 5 — 585.00
47/64 .7344 5-5/8 9-3/4 2 110.00 99.13 1-25/32 1.7812 10-1/8 17-1/8 5 570.00 540.62
3/4 .7500 5-7/8 9-3/4 2 96.19 91.74 1-13/16 1.8125 10-1/8 17-1/8 5 580.00 555.98
49/64 .7656 6 9-7/8 2 — 104.94 1-27/32 1.8438 10-1/8 17-1/8 5 — 600.60
25/32 .7812 6 9-7/8 2 106.21 98.95 1-7/8 1.8750 10-3/8 17-3/8 5 676.50 653.40
51/64 .7969 6-1/8 10-3/4 3 — 110.88 1-29/32 1.9062 10-3/8 17-3/8 5 742.50 693.00
13/16 .8125 6-1/8 10-3/4 3 110.96 105.40 1-15/16 1.9375 10-3/8 16-7/8 4 — 719.40
53/64 .8281 6-1/8 10-3/4 3 118.98 115.50 1-15/16 1.9375 10-3/8 17-3/8 5 750.00 719.40
27/32 .8438 6-1/8 10 2 129.00 — 1-31/32 1.9688 10-3/8 17-3/8 5 759.00 726.00
27/32 .8438 6-1/8 10-3/4 3 115.36 111.40 2 2.0000 10-3/8 17-3/8 5 670.00 627.00
55/64 .8594 6-1/8 10-3/4 3 122.10 116.82 2-1/32 2.0312 10-3/8 17-3/8 5 — 759.00
7/8 .8750 6-1/8 10-3/4 3 120.00 116.00 2-1/16 2.0625 10-1/4 17-3/8 5 780.63 775.50
57/64 .8906 6-1/8 10-3/4 3 145.00 117.48 2-3/32 2.0938 10-1/4 17-3/8 5 — 812.00
29/32 .9062 6-1/8 10-3/4 3 122.17 117.43 2-1/8 2.1250 10-1/4 17-3/8 5 — 759.00
59/64 .9219 6-1/8 10-3/4 3 135.00 131.34 2-5/32 2.1562 10-1/4 17-3/8 5 — 825.00
15/16 .9375 6-1/8 10-3/4 3 124.28 117.92 2-3/16 2.1875 10-1/4 17-3/8 5 — 970.20
61/64 .9531 6-3/8 11 3 145.00 132.00 2-1/4 2.2500 10-1/8 17-3/8 5 962.45 957.00
31/32 .9688 6-3/8 11 3 137.46 131.52 2-9/32 2.2812 10-1/8 17-3/8 5 — 1052.70
63/64 .9844 6-3/8 11 3 — 148.50 2-5/16 2.3125 10-1/8 17-3/8 5 1195.00 1089.00
1 1.0000 6-3/8 11 3 138.93 132.46 2-11/32 2.3437 10-1/8 17-3/8 5 1300.00 1197.90
1-1/64 1.0156 6-1/2 11-1/8 3 175.00 165.00 2-3/8 2.3750 10-1/8 17-3/8 5 1150.00 1056.00
1-1/32 1.0312 6-1/2 11-1/8 3 153.95 148.67 2-13/32 2.4062 11-1/4 18-3/4 5 — 1498.00
1-3/64 1.0469 6-5/8 11-1/4 3 — 182.16 2-7/16 2.4375 11-1/4 18-3/4 5 — 1254.00
1-1/16 1.0625 6-5/8 11-1/4 3 171.60 165.04 2-1/2 2.5000 11-1/4 18-3/4 5 — 1221.00
1-5/64 1.0781 6-7/8 11-1/2 3 196.00 184.80 2-17/32 2.5312 11-7/8 19-1/2 5 — 1608.00
1-3/32 1.0938 6-7/8 11-1/2 3 — 182.16 2-9/16 2.5625 11-7/8 19-1/2 5 — 1303.50
1-3/32 1.0938 6-7/8 12-1/2 4 185.65 177.69 2-5/8 2.6250 11-7/8 19-1/2 5 — 1320.00
1-1/8 1.1250 7-1/8 12-3/4 4 190.74 184.29 2-11/16 2.6875 12-3/4 20-3/8 5 — 1336.50
1-9/64 1.1406 7-1/4 12-7/8 4 — 202.72 2-3/4 2.7500 12-3/4 20-3/8 5 — 1643.40
1-5/32 1.1562 7-1/4 12-7/8 4 194.70 184.90 2-13/16 2.8125 13-3/8 21-1/8 5 — 1630.20
1-3/16 1.1875 7-3/8 12 3 197.34 — 2-7/8 2.8750 13-3/8 21-1/8 5 1800.00 1640.10
1-3/16 1.1875 7-3/8 13 4 197.34 184.90 2-15/16 2.9375 14 21-3/4 5 — 1914.00
1-13/64 1.2031 7-1/2 13-1/8 4 217.80 209.88 3 3.0000 14 21-3/4 5 1979.34 1979.34
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