Page 98 - Michigan Drill

Core Drills

High Speed Steel – Oxide Finish
Used to enlarge and straighten cored or drilled holes.
Because of their ridigity, these tools generate closer tolerance Additional 64th sizes available on request
HOLE MAKING Straight Shank – 45° Chamfer End
holes and a better finish than standard drills.They may be used
to enlarge holes as small as 70-80% of the tool diameter.

List No. 421 – Three Flute
List No. 422 – Four Flute
Price Each
Price Each
Dec.
Flute
Dec.
Flute
Size
Length
421
422
Length
422
421
Equiv. Length Overall 3 - Flute 4 - Flute Size Equiv. Length Overall 3 - Flute 4 - Flute
#10 .1935 3-5/8 6 — 29.50 51/64 .7969 6-1/8 10 126.68 122.50
13/64 .2031 3-5/8 6 — 21.00 13/16 .8125 6-1/8 10 126.68 117.75
7/32 .2188 3-5/8 6 24.50 — 53/64 .8281 6-1/8 10 — 155.00
15/64 .2344 3-3/4 6-1/8 — 24.50 27/32 .8438 6-1/8 10 144.78 122.87
1/4 .2500 3-3/4 6-1/8 26.50 24.50 7/8 .8750 6-1/8 10 119.64 117.75
17/64 .2656 3-7/8 6-1/4 28.46 26.00 57/64 .8906 6-1/8 10 157.87 130.40
9/32 .2812 3-7/8 6-1/4 29.00 26.50 29/32 .9062 6-1/8 10 130.41 125.00
19/64 .2969 4 6-3/8 30.40 27.00 15/16 .9375 6-1/8 10-3/4 149.60 138.00
5/16 .3125 4 6-3/8 30.40 27.00 61/64 .9531 6-3/8 11 — 163.28
21/64 .3281 4-1/8 6-1/2 — 28.80 31/32 .9688 6-3/8 11 179.55 155.50
11/32 .3438 4-1/8 6-1/2 32.00 29.97 1 1.0000 6-3/8 11 169.00 148.60
23/64 .3594 4-1/4 6-3/4 33.90 30.36 1-1/32 1.0312 6-1/2 11-1/8 202.41 202.41
3/8 .3750 4-1/4 6-3/4 35.17 31.00 1-1/16 1.0625 6-5/8 11-1/4 222.16 216.45
10mm .3937 4-3/8 7 63.90 — 1-3/32 1.0938 6-7/8 11-1/2 — 225.40
13/32 .4062 4-3/8 7 36.44 32.40 1-1/8 1.1250 7-1/8 11-3/4 259.92 234.54
27/64 .4219 4-5/8 7-1/4 39.20 33.50 1-5/32 1.1562 7-1/4 11-7/8 261.00 239.13
10.75mm .4232 4-5/8 7-1/4 58.00 — 1-3/16 1.1875 7-3/8 12 239.13 239.13
7/16 .4375 4-5/8 7-1/4 41.00 34.60 1-7/32 1.2188 7-1/2 12-1/2 252.40 252.40
11.75mm .4626 4-3/4 7-1/2 66.15 — 1-15/64 1.2344 7-7/8 12-1/2 365.00
29/64 .4531 4-3/4 7-1/2 — 36.30 1-1/4 1.2500 7-7/8 12-1/2 372.00 277.50
15/32 .4688 4-3/4 7-1/2 44.10 36.65 1-9/32 1.2812 8-1/4 14-1/8 342.68 315.36
31/64 .4844 4-3/4 7-3/4 46.20 37.40 1-19/64 1.2969 8-5/8 14-1/4 — 350.00
1/2 .5000 4-3/4 7-3/4 46.20 39.92 1-5/16 1.3125 8-5/8 14-1/4 324.54 324.54
33/64 .5156 4-3/4 8 — 51.50 1-11/32 1.3438 8-3/4 14-3/8 369.90 350.00
17/32 .5312 4-3/4 8 49.65 46.00 1-3/8 1.3750 8-7/8 14-1/2 379.10 360.22
9/16* .5625 4-7/8 8-1/4 52.60 49.00 1-13/32 1.4062 9-1/8 14-5/8 — 368.50
19/32 .5938 4-7/8 8-3/4 57.78 55.00 1-7/16 1.4375 9-1/8 14-3/4 425.15 384.00
39/64 .6094 4-7/8 8-3/4 — 80.40 1-15/32 1.4688 9-1/4 14-7/8 428.04 399.00
15.75mm .6201 4-7/8 8-3/4 81.50 — 1-1/2 1.5000 9-3/8 15 441.45 420.50
5/8 .6250 4-7/8 8-3/4 69.36 62.80 1-9/16 1.5625 9-5/8 15-1/4 362.34 493.16
41/64 .6406 5-1/8 9 83.00 81.70 1-39/64 1.6094 9-5/8 15-1/4 549.00 —
21/32 .6562 5-1/8 9 72.00 68.00 1-5/8 1.6250 9-7/8 15-5/8 — 549.00
43/64 .6719 5-3/8 9-1/4 86.00 84.00 1-21/32 1.6562 9-7/8 15-5/8 675.00 —
11/16 .6875 5-3/8 9-1/4 76.45 72.00 1-11/16 1.6875 10-1/8 16 — 630.00
23/32 .7188 5-5/8 9-1/2 79.99 77.60 1-3/4 1.7500 10-1/2 16-1/4 — 660.11
47/64 .7344 5-7/8 9-3/4 — 98.75 1-49/64 1.7656 10-1/2 16-1/4 — 730.00
3/4 .7500 5-7/8 9-3/4 89.68 83.50 1-13/16 1.8125 10-1/2 16-1/4 428.00 722.00
49/64 .7656 6 9-7/8 — 98.75 1-27/32 1.8438 10-5/8 16-1/4 855.00 —
25/32 .7812 6 9-7/8 117.14 101.00 1-7/8 1.8750 10-5/8 16-1/4 — 715.45
*9/16 with 1/2" Shank in stock $56.50 each
Carbide Tipped Taper Shank
List No. CT522 – Four Flute
Dec. Length of Flute Overall Morse Price Dec. Length of Flute Overall Morse Price
Size Size
Equiv. Carbide Length Length Taper No. Each Equiv. Carbide Length Length Taper No. Each
1/2 .5000 3/4 4-3/8 8-1/4 2 118.86 1 1.0000 7/8 4-7/8 9-1/2 3 146.60
17/32 .5312 3/4 4-3/8 8-1/4 2 119.63 1-1/32 1.0312 7/8 4-7/8 9-1/2 3 152.12
9/16 .5625 3/4 4-3/8 8-1/4 2 119.63 1-1/16 1.0625 7/8 4-7/8 9-1/2 3 154.11
19/32 .5938 3/4 4-3/8 8-1/4 2 125.28 1-3/32 1.0938 1 4-7/8 10-1/2 4 179.93
5/8 .6250 3/4 4-3/8 8-1/4 2 125.28 1-1/8 1.1250 1 4-7/8 10-1/2 4 189.71
21/32 .6562 3/4 4-3/8 8-1/4 2 126.88 1-5/32 1.1562 1 4-7/8 10-1/2 4 195.20
11/16 .6875 7/8 4-3/8 8-1/4 2 128.08 1-3/16 1.1875 1 4-7/8 10-1/2 4 201.53
3/4 .7500 7/8 4-3/8 8-1/4 2 128.08 1-1/4 1.2500 1 4-7/8 10-1/2 4 202.82
25/32 .7812 7/8 4-3/8 8-1/4 2 131.85 1-9/32 1.2812 1 4-7/8 10-1/2 4 217.91
13/16 .8125 7/8 4-7/8 9-1/2 3 134.06 1-5/16 1.3125 1 4-7/8 10-1/2 4 223.35
27/32 .8438 7/8 4-7/8 9-1/2 3 141.75 1-3/8 1.3750 1 4-7/8 10-1/2 4 233.70
7/8 .8750 7/8 4-7/8 9-1/2 3 141.75 1-7/16 1.4375 1 4-7/8 10-1/2 4 245.69
15/16 .9375 7/8 4-7/8 9-1/2 3 142.72 1-15/32 1.4688 1 4-7/8 10-1/2 4 258.27
31/32 .9688 7/8 4-7/8 9-1/2 3 146.60 1-1/2 1.5000 1 4-7/8 10-1/2 4 258.27
96 Hole Enlarging Core Drill - 1/2" Shank on Page 72