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.

Tech Specs

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

Name: Cobalt Steel Drill Bits
Brand: Triumph
SKU: 8518
Price: 3.2 USD
Availability: InStock
Rating: 4.67 (3 reviews)

3 of 3 Reviews

April 23, 2012

Cobalt drill 3/32"

By cjb from Old Saybrook, CT

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.

Bottom Line Yes, I would recommend to a friend

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August 28, 2008

Very high quality[...]

By Chip from North Idaho

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

Bottom Line Yes, I would recommend to a friend

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August 25, 2008

Best for stainless steel

By Cliff from Onset, MA

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.

Bottom Line Yes, I would recommend to a friend

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