Model # 48-89-2304

Internet #203115290

Store SKU #1001294887

Store SO SKU #1000670096

Milwaukee 7/64 in. Thunderbolt Cobalt Drill Bit
0045242188192

Milwaukee

7/64 in. Thunderbolt Cobalt Drill Bit

  • Variable helix design for fast material removal
  • Chip breaker decreases heat build up
  • Stays sharper longer
$2.77 /each

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Product Overview

The Milwaukee 48-89-2304 Thunderbolt Cobalt coated drill bits (2-Pack) are designed for extreme durability and long life. The Thunderbolt web features a thicker core than a standard drill bit, which provides ultimate strength and protects against side-load breakage. A specially designed parabolic flute form clears chips and debris fast to keep the bit cool. A precision start, 135-degree Split Point tip starts on contact to keep the bit from walking for fast accurate holes. Excellent for drilling on curved surfaces, requires less effort to drill and is highly recommended for use with portable drills. Two per package.

  • Thunderbolt web, provides longer life and faster driller times
  • Parabolic flute, clears chips faster
  • 136-degree split point, precision start no walking
  • Specialty bit for cast iron and stainless steel

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Customer Questions & Answers

Question is about Thunderbolt Cobalt drill bit specifications

Item description does not specify either hardness (M42, M36, etc.) or Cobalt percentage (5%, 8%, etc.). Are these bit solid Cobalt Alloy Steel or simply coated High Speed Steel bits? Item description also says they are Titanium coated, probably a typo.
Asked by: ztywa6
Solid cobalt and titanium coated. I used this bit to drill through a grade 8 bolt and stainless steel. Used new bits both times. Light lubricant recommended during use. I've used non-titanium coated bits before and they work just as good.
Answered by: StaceyDean
Date published: 2017-03-14

length of drill bit?

need length to be 2-1/4" min.
Asked by: Jim
It is "jobber" length. That is 3 3/4" .
Answered by: ivycat
Date published: 2017-02-11
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Customer Reviews

7/64 in. Thunderbolt Cobalt Drill Bit is rated 3.9 out of 5 by 98.
Rated 1 out of 5 by from Well I have to give it 1 star. I was drilling 3/8" 1018 cold rolled and after about the 3rd hole... Well I have to give it 1 star. I was drilling 3/8" 1018 cold rolled and after about the 3rd hole it was so dull it wouldn't cut at all any longer. It might be alright for other materials but if you want it for mild steel, keep looking - get a set of Drill Hog's!
Date published: 2016-12-06
Rated 3 out of 5 by from So so drill bit Used to drill out exhaust manifold studs that broke off and it went dull a lot quicker than it should of. Was junk after the job was done.
Date published: 2016-10-19
Rated 3 out of 5 by from 10x life, yeah right. Hope you're good at sharpening. You'll need to do it a lot if your using on... 10x life, yeah right. Hope you're good at sharpening. You'll need to do it a lot if your using one of these.
Date published: 2016-11-04
Rated 3 out of 5 by from I am conflicted about the rating for this item. I was drilling a number of holes in 3/16" plate i... I am conflicted about the rating for this item. I was drilling a number of holes in 3/16" plate in a drill press and it was doing an awesome job. When I switched to drilling holes in the 1/4" plate that makes up the frame of my trencher it seemed much slower. The bad part was that when it broke through it jammed and snapped off. This was in a 20 volt hand held drill. I feel that snapping like this is totally unacceptable in a relatively large bit. The body is just far too brittle. Since most people will probably be using it in a handheld drill motor I am going to only give it a 3 star. If you are using it in a drill press I would rate it 5 star.
Date published: 2016-12-02
Rated 5 out of 5 by from It's a two pack! Given I needed this to replace a bit from a set that broke, I was psyched to see the pack contained two identical bits, something I didn't realize when I ordered it. What a great idea for smaller bits! The "no walking" tip is great and seems to hold position well. It cuts well through a mix of different materials and claims to have a "thicker core than a standard drill bit to provide ultimate strength and protect against side-load breakage" - which is just what I need!
Date published: 2016-11-04
Rated 3 out of 5 by from Similar to another review posted on here, I had the problem of a exhaust bolt breaking. Had heard... Similar to another review posted on here, I had the problem of a exhaust bolt breaking. Had heard that "Cobalt" would cut thru any metal like butter. *(I did not have cutting fluid at the time) So I went to Home Depot because it was a Sunday and tried to cut thru, it worked Fairly Well. But I didn't cut through to the end because it was taking too much time and was getting heated. I ended up having to take the muffler completely off and breaking the other bolt upon trying to take it off. Then knocked out the stud and replaced with (2) two bolts/nuts and washers. My rating is Very Low because it did NOT do the job i expected it to. I believe if I had cutting fluid, the 3/8 in Thunderbolt Cobalt Drill Bit from Milwaukee could have done the job. It was working Fairly Well until it got hot, I would then have to let it cool down and try again.
Date published: 2016-11-08
Rated 1 out of 5 by from The holes these bits were producing in 1/8 mild steel were out of round almost triangle in shape ... The holes these bits were producing in 1/8 mild steel were out of round almost triangle in shape and the edge finish in the holes was terrible. Being the most expensive 1/2 bit in the store I would expect much better performance. I was drilling on a drill press and it was a night and day difference between the Milwaukee and dewalt. I will never buy these bits again. In the image hole with dewalt bits on left. Brand new Milwaukee on right.
Date published: 2017-02-17
Rated 5 out of 5 by from After some research for a drill bit to use on a utility trailer bed replacement project, I bought... After some research for a drill bit to use on a utility trailer bed replacement project, I bought this one a few weeks ago. I needed to drill 24 holes, each through 1.5" wood, sheetmetal, upper & lower 1/8 " skin on steel channels! After discovering that the steel channel skin was actually 3/16", I was sure that I should have bought more than one drill bit. This bit performed as advertised and was still working fine with the last hole!
Date published: 2017-01-03
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