Model # 49-56-9645

Internet #202327761

Store SKU #231194

Milwaukee 4 in. Bi-Metal Hole Saw
0045242198566

Milwaukee

4 in. Bi-Metal Hole Saw

  • Rip Guard, the strongest tooth form in the industry
  • 8% cobalt construction for increased wear resistance
  • Plug Jack, an all access slot design for fast plug removal
$19.97 /each

Frequently Bought Together

Product Overview

Use the Milwaukee 4 in. Bi-Metal Hole Saw to cut holes in a variety of materials. The steel hole saw can drill almost 2 in. D. Milwaukee Ice Hardened products utilize a proprietary cryogenic hardening process that improves upon traditional heat treat processes. Unlike surface coatings that wear away, cryogenics harden to the core by minimizing soft metal (austenite) and creating more hard metal (Marten site). The result is a product that is more consistently hard throughout, resulting in life up to 50% longer than the competition.

  • 1/2 in. chuck size
  • High-speed steel construction
  • 4 in. Dia
  • 1-51/64 in. drilling depth

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Customer Questions & Answers

55 Questions111 Answers

Customer Questions & Answers

4 in. Bi-Metal Hole Saw
4 in. Bi-Metal Hole Saw

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This question is from 6 in. Hole Dozer Hole Saw
 
2 answers

can i use this on metal hvac duct

This question is from 6 in. Hole Dozer Hole Saw
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May 2, 2016
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May 3, 2016
Answer: 
Yes, this hole saw is made for cutting metal.
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May 3, 2016
Answer: 
Yes. You can use this saw on Metal HVAC duct.
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This question is from 4 in. Bi-Metal Hole Saw
 
2 answers

Cutting thru Clear Extruded Acrylic Plexiglass Sheet

This question is from 4 in. Bi-Metal Hole Saw
Asked by
Lake Orion, MI
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February 28, 2016
Can I use this hole saw in drill press to cut thru Clear Extruded Acrylic Plexiglass Sheet 3/8 inch thick?
If yes, then what speed is recommended, 600 RPM or lower? Should I use any fluids to reduce generated heat? Thanks, Max
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Asked by
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October 25, 2016
Answer: 
I'm sure that it would , but the plastic might melt on the blade.
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Asked by
Dothan,Al.
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July 15, 2016
Answer: 
Yes it will but take it slow so not to crack the material. Some persons run the drill in reverse after the center bit is through to cut without digging into the material, the more teeth you have on a bit (finer cut blade) is what you need to cut such materials.
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This question is from 4-1/2 in. Hole Dozer Hole Saw
 
1 answer

With enough cutting oil or wax, will this bit cut through 1/2" steel?

This question is from 4-1/2 in. Hole Dozer Hole Saw
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April 5, 2016
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April 21, 2016
Answer: 
Yes, the Hole Dozer can cut through thick steel, even I-beams. For thick steel low RPM with generous cutting fluid/wax is recommended.
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This question is from 4 in. Bi-Metal Hole Saw
 
2 answers

Cut through brick for dryer exhaust?

This question is from 4 in. Bi-Metal Hole Saw
Asked by
chicago
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February 10, 2016
Trying to drill the exhaust hole for the dryer. Can I used this to drill through brick? its an old chicago building?
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Asked by
Dothan,Al.
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July 15, 2016
Answer: 
It's tough enough to cut through brick, however you will need either a deeper saw depth or go as deep as you can then chisel out center and drill again. It will not get you all the way through the brick in one run.
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April 21, 2016
Answer: 
No. This hole saw cannot cut through brick.
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Customer Reviews

4 in. Bi-Metal Hole Saw is rated 4.1 out of 5 by 283.
Rated 5 out of 5 by from Awsome tool I needed to cut a hole in a steel "I" beam. Amazingly, it cut through it with no trouble.
Date published: 2016-10-11
Rated 5 out of 5 by from I used this with a quick change center drill bit arbor from Milwaukee and this was an excellent h... I used this with a quick change center drill bit arbor from Milwaukee and this was an excellent hole saw through my roof for a new attic fan vent. Makita 18V LXT 1/2 drill in higher torque mode was sufficient to cut through without flaw or trouble, maintaining light pressure and letting the saw do the work. A heavier duty drill would have provided even more torque, and with a handle mounted I think this saw would have drilled through quite rapidly. Excellent quality, excellent performance.
Date published: 2017-01-10
Rated 1 out of 5 by from Product Description Inaccurate The product description for this hole saw indicates that the Milwaukee arbor item number 49-56-7250 will fit this hole saw, which I made sure of before I bought because that is the arbor I have. However, it does not fit. If you look at the product description for the arbor, it indicates it is only for 1 1/4" and larger hole saws. Milwaukee and/or Home Depot need to get it together and make sure all products that are indicated to be compatible do in fact work together.
Date published: 2016-07-27
Rated 3 out of 5 by from Doesn't cut through metal I bought this to cut through a 20ga steel sheet for an enclosure, but it didn't work at all. Had to buy a step drill to get the job done. Also tried this on thin stucco. It got through, but the bit was completely burnt out doing so. The packaging didn't say you could use for stucco, but I thought I would mention it in case anyone was wondering how it would perform. Don't recommend this product for metal or stucco use. This did work great with wood.
Date published: 2016-08-16
Rated 5 out of 5 by from Does the job if you keep it cool I see a number of reviews criticize this saw because it dulled on them in both wood or metal. I too have ruined some of these hole saws in the past by not keeping them cool while sawing the hole. Use lots of oil or soapy water in a spray bottle to cool the teeth as you are drilling and the saw teeth will retain their temper and saw efficiently. This one worked great to cut a taillight hole in jeep CJ body armor .
Date published: 2016-09-28
Rated 1 out of 5 by from Lasted less than a week Bought to cut holes in thin metal this tool only made 6 holes before being completely rounded out and unusable. The only thing worse than this product was the terrible customer service. Do yourself a favor a buy a nicer tool. I will not be buying another Milwaukee tool because of the poor quality and horrendous customer service.
Date published: 2016-08-16
Rated 1 out of 5 by from poor performance, drilled one hole in sheet metal and blade is dull when drilling the sheet metal which was only .032" thick the center bit wobbled and the hole drill started to orbit, had to exert a lot of pressure to cut. When the hole was finished the hole drill was completely dull and the drilled hole was undersized. Had to use half round files to finish hole.
Date published: 2016-08-16
Rated 5 out of 5 by from The hole saw did what it was designed for I bored 10 holes in 3\4 thick cast iron plates with on... The hole saw did what it was designed for I bored 10 holes in 3\4 thick cast iron plates with only one hole saw I completed the job under the estimated time which equals profit They are good for those who know feeds and speed run them a slow rpm and they will last many jobs down the road
Date published: 2016-12-20
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