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IRWIN Cobalt High Speed Steel Drill Bit, 17/64" Item # 172993
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- 8% Cobalt for higher heat and abrasion resistance
- Heavy-duty web construction for strength and durability
- 135º split point begins drilling immediately, minimizing bit "walk"
|Applicable Materials||Hard Steel, Stainless Steel, Titanium|
|Cutting Diam||17/64 in|
|Cutting Edge Material||HSS-E (Co-M42)|
|Flute Length||2 7/8 in|
|Overall Length||2 5/8 in|
|Tool Type||drilling tool|
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IRWIN Cobalt High Speed Steel Drill Bit, 17/64" is rated out of 5 by 4.
Rated 1 out of 5 by lonewolf from horrible - unless you're drilling a banana! Tried to step drill 1/8" thick soft steel ( from 1/8 to 1/4" in 64th increments). The 1/8" bit did the 8 holes with no issue. Then with each increasing size every time a bit just started to cut thru the final portion, the cutting flute broke off - regardless of how careful I was. Finally decided to find an old Sears tool steel bit (1/4") bought more than 20 years ago in a junk drawer and it finished the job fine. These Cobalt bits are as brittle as glass and just as worthless for drilling steel.
Date published: 2018-05-29
Rated 4 out of 5 by Cool hand from Cobalt Bits I' m a tradesmen working for my self so I need quality & durability. Irwin has both at a reasonable price. Cobalt bits are designed for harder metals like stainless steel so they are more brittle then other bits and do not tolerate any flexing .If you wabble them to widen a hole they will snap. You must use exact perpendicular force to the work surface or they will snap. So slow down the rpm but increase the pressure. Cool the bit down with water or use cutting oil they will last many times over.
Date published: 2017-05-27
Rated 1 out of 5 by Skins from cobalt drill bits Bought a new set of bits yesterday and I needed to drill6 holes through both 1/8" & 1/4" Angle iron bed frame material. The cobalt bits I bought failed miserably, could hardly get it done. Ended up having to step drill to get 6 - 1/4" holes through the material. I won't buy Irwin bits again!!
Date published: 2015-04-01
Rated 5 out of 5 by Randy Brumback from Mr. These cobalt drill bits are the only thing that will drill into hardened bolts and metals. I have tried standard bits on hardened metal before not knowing what grade the metal was. The standard bit dulls almost immediately so I reach for the cobalt bits. They will sink on through the metal with no problem. The only cons are they are more expensive and they will break easily if you put force perpendicular to the bit instead of linear.
Date published: 2013-05-28