Cobalt Steel Drill Bits
Triumph Triumph Twist Drill
  • Cobalt Steel Drill Bits

Cobalt Steel Drill Bits
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.

 
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Tech Spec Product Info User Generated Content
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 
BRAND: Triumph
Type: Cobalt
4.7 3

Cobalt drill 3/32"

5

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.

cjb

Old Saybrook, CT

true

Very high quality[...]

5

Good product, Quick [...], Fair cost, Good company response. I'm very pleased overall.

Chip

North Idaho

true

Best for stainless steel

4

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.

Cliff

Onset, MA

true

Cobalt Steel Drill Bits

4.73

100.0
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