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Cobalt Steel Drills
Super Duty Cobalt Drill Bits for drilling hard metals.
Cobalt Drills are the best choice for stainless steel and other difficult-to-drill alloy applications.
135-degree split-point for quick penetration and reduced walking . M-35 Cobalt steel for increased heat resistance and longer life. Heavy Duty construction.
| Size (inches) | Decimal Equivalent | Flute Length (inches) | Overall Length (inches) |
|---|---|---|---|
| 5/64 | .0781 | 1 | 2 |
| 3/32 | .0937 | 1-1/4 | 2-1/4 |
| 7/64 | .1094 | 1-1/2 | 2-5/8 |
| 1/8 | .1250 | 1-5/8 | 2-3/4 |
| 9/64 | .1406 | 1-3/4 | 2-7/8 |
| 5/32 | .1562 | 2 | 3-1/8 |
| 11/64 | .1719 | 2-1/8 | 3-1/4 |
| 3/16 | .1875 | 2-5/16 | 3-1/2 |
| 13/64 | .2031 | 2-7/16 | 3-5/8 |
| 7/32 | .2188 | 2-1/2 | 3-3/4 |
| 15/64 | .2344 | 2-5/8 | 3-7/8 |
| 1/4 | .2500 | 2-3/4 | 4 |
| 17/64 | .2656 | 2-7/8 | 4-1/8 |
| 9/32 | .2812 | 2-15/16 | 4-1/4 |
| 19/64 | .2969 | 3-1/16 | 4-3/8 |
| 5/16 | .3125 | 3-3/16 | 4-1/2 |
| 21/64 | .3281 | 3-5/16 | 4-5/8 |
| 11/32 | .3438 | 3-7/16 | 4-3/4 |
| 23/64 | .3594 | 3-1/2 | 4-7/8 |
| 3/8 | .3750 | 3-5/8 | 5 |
| 25/64 | .3906 | 3-3/4 | 5-1/8 |
| 13/32 | .4062 | 3-7/8 | 5-1/4 |
| 27/64 | .4219 | 3-5/16 | 5-3/8 |
| 7/16 | .4375 | 4-1/16 | 5-1/2 |
| 29/64 | .4531 | 4-3/16 | 5-5/8 |
| 15/32 | .4688 | 4-5/16 | 5-3/4 |
| 31/64 | .4844 | 4-3/8 | 5-7/8 |
| 1/2 | .5000 | 4-1/2 | 6 |
| 17/32 | .531 | 4-13/16 | 6-5/8 |
| 21/32 | .656 | 5-3/16 | 7-1/8 |
Reviews for Cobalt Steel Drill Bits
April 23, 2012
Bought several of these expecting them to break or dull quickly, have to admit one bit did the job drilling through a lot of hard steel. Pleasant surprise to be fully satisfied with this purchase.
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August 28, 2008
Good product, Quick [...], Fair cost, Good company response. I'm very pleased overall.
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August 25, 2008
I needed to drill additional holes in my SS pulpits. Ordinary HSS drills didn't work for beans. The cobalt drills were the only ones that worked.
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