Page 42 - Michigan Drill

NC/CNC Spotting Drills

High Speed Steel, Cobalt, & TiN Coated
These drills are used for perfect alignment of the follow-on tool.
HOLE MAKING Standard Length 90° Point 120° Point
Cobalt drills are used in drilling tough, high tensile strength
materials like Stainless Steels, Titanium, and Inconel.

82° Point
List No. 311 – High Speed
List No. 310C – Cobalt
List No. 309C – Cobalt
List No. 311C – Cobalt
List No. 311T – TiN Coated List No. 309 – High Speed List No. 310– High Speed
List No. 309T – TiN Coated
List No. 310T – TiN Coated
Price Each
82° Point 90° Point 120° Point
Decimal Overall Flute
Size H.S. Cobalt TiN Coated H.S. Cobalt TiN Coated H.S. Cobalt TiN Coated
Equivalent Length Length
311 311C 311T 309 309C 309T 310 310C 310T
1/8 .1250 1-7/8 1/2 14.92 40.66 31.56 14.48 37.53 28.60 14.92 40.61 31.56
5/32 .1562 2-1/16 9/16 16.52 45.06 34.83 16.08 41.70 31.78 16.92 39.35 34.93
3/16 .1875 2-3/16 9/16 17.42 46.10 36.81 16.32 44.91 33.80 17.42 40.26 36.81
1/4 .2500 2-1/2 3/4 17.52 47.16 37.05 17.32 43.60 34.25 17.52 41.18 37.05
3/8 .3750 3-1/8 1-1/8 18.86 50.76 38.89 18.64 47.00 36.85 18.86 44.33 39.89
1/2 .5000 3-3/4 1-3/8 24.16 65.08 51.09 23.86 60.22 47.15 24.16 56.84 51.09
5/8 .6250 4-3/8 1-5/8 31.30 84.40 62.36 31.56 79.61 62.36 31.30 73.71 66.19
3/4 .7500 5 1-7/8 40.24 108.56 85.01 39.82 100.40 78.72 40.24 94.82 85.08
1 1.0000 6 2-1/4 67.97 183.26 143.73 67.22 169.52 132.90 67.94 160.07 143.73

Long Length
90° Point 120° Point
List No. 309L – High Speed List No. 310L – High Speed
List No. 309LT – TiN Coated List No. 310LT – TiN Coated
Price Each
90° Point 120° Point
Decimal Overall Flute
Size
Equivalent Length Length H.S. TiN Coated H.S. TiN Coated
309L 309LT 310L 310LT
1/4 .2500 4 3/4 25.32 50.03 25.84 51.08
3/8 .3750 5 1-1/8 26.56 52.50 27.16 53.69
1/2 .5000 6 1-3/8 33.16 65.53 33.94 67.09
5/8 .6250 7 1-5/8 42.42 83.85 43.56 86.11
3/4 .7500 8 1-7/8 56.96 112.61 58.10 114.86
1 1.0000 8 2-1/4 72.54 143.40 74.00 146.30

Extra Long Length
90° Point 120° Point
List No. 309XL – High Speed List No. 310XL – High Speed
List No. 309XLT – TiN Coated List No. 310XLT – TiN Coated
Price Each
90° Point 120° Point
Decimal Overall Flute
Size
Equivalent Length Length H.S. TiN Coated H.S. TiN Coated
309XL 309XLT 310XL 310XLT
1/4 .2500 6 3/4 35.18 69.44 36.14 71.42
3/8 .3750 7 1-1/8 37.00 73.15 37.62 74.35
1/2 .5000 8 1-3/8 44.92 88.79 45.70 90.34
5/8 .6250 9 1-5/8 58.78 116.23 58.74 118.10
3/4 .7500 10 1-7/8 76.56 151.36 77.76 153.73
1 1.0000 10 2-1/4 93.74 185.32 95.48 188.78

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