Page 39 - Michigan Drill

Cobalt Standard Step Drills

An essential tool for every tool room. One tool does two jobs
in a single pass. They can be sharpened repeatedly and are
easily modified for any special length-of-step.

For Drilling and Counterboring
Cap Screw Clearance Holes
List No. 371C – Jobber Length HOLE MAKING

Screw Minor Major Step Flute Overall Price Screw Minor Major Step Flute Overall Price
Size Diameter Diameter Length Length Length Each Size Diameter Diameter Length Length Length Each
No. 6 .150 1/4 1/2 2-3/4 4 30.82 5/16 11/32 1/2 3/4 4-1/2 6 59.16
No. 8 .178 L 1/2 2-15/16 4-1/4 35.29 3/8 13/32 19/32 7/8 5-3/16 7-1/8 94.57
No. 10 .204 Q 5/8 3-7/16 4-3/4 38.61 7/16 15/32 11/16 1 5-5/8 7-5/8 112.86
1/4 9/32 13/32 11/16 3-7/8 5-1/4 44.55 1/2 17/32 25/32 1 3-1/4 5-1/8* 155.63
*Shorter than Jobber Length.

For Drilling and Countersinking 82° Flat Head
Machine Screw Clearance Holes
List No. 372C – Jobber Length
Screw Minor Major Step Flute Overall Price Screw Minor Major Step Flute Overall Price
Size Diameter Diameter Length Length Length Each Size Diameter Diameter Length Length Length Each
No. 6 .142 9/32 1/2 2-15/16 4-1/4 32.67 5/16 .320 5/8 3/4 5-3/16 7-1/8 81.74
No. 8 .169 Q 1/2 3-7/16 4-3/4 38.60 3/8 .383 3/4 7/8 3-1/8 5* 113.28
No. 10 .196 W 5/8 3-3/4 5-1/8 42.13 7/16 .446 13/16 1 3-3/8 5-1/4* 147.55
1/4 .257 1/2 11/16 4-1/2 6 52.14 1/2 .510 7/8 1 3-1/2 5-1/2* 162.81
*Shorter than Jobber Length.

For Drilling 45° Chamfered Holes
To-Be-Tapped (To produce approx. 70% thread)
List No. 370C – Jobber Length

Screw Minor Major Step Flute Overall Price Screw Minor Major Step Flute Overall Price
Size Diameter Diameter Length Length Length Each Size Diameter Diameter Length Length Length Each
6-32 .1096 5/32 1/2 2 3-1/8 27.90 12-24 .1781 9/32 11/16 2-15/16 4-1/4 35.30
8-32 .1356 3/16 1/2 2-5/16 3-1/2 28.60 1/4-20 .2045 21/64 13/16 3-5/16 4-5/8 37.46
10-24 .1521 1/4 5/8 2-3/4 4 30.39 5/16-18 .2619 13/32 15/16 3-7/8 5-1/4 42.69
10-32 .1616 1/4 5/8 2-3/4 4 30.39 3/8-16 .3181 31/64 1 4-3/8 5-7/8 56.47

Sets
High Speed Cobalt
Size Pcs. Description Set No. Price Set No. Price

No. 6 – 3/8 NC screw sizes 6 Cap Screw, Jobber Length 371S 172.45 371CS 307.12
No. 6 – 3/8 NC screw sizes 6 Cap Screw, Taper Length 471S 249.18 –– ––
No. 6 – 3/8 NC screw sizes 6 Flat Head Screw, Jobber Length 372S 204.44 372CS 364.68
6-32, 8-32, 10-24, 1/4-20,
5/16-18, 3/8-16 6 Tap Drill, Jobber Length 370S 128.29 370CS 227.63
6-32, 8-32, 10-24, 1/4-20, 6 Tap Drill, Taper Length 470S 191.01 –– ––
5/16-18, 3/8-16
3mm – 10mm Screw Sizes 6 Metric Cap Screw, Jobber Length 371MS 196.76 –– ––
3mm – 10mm Tap Sizes 6 Metric Tap Drill, Jobber Length 370MS 135.84 –– ––
All sets are supplied in wood block

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