|Item Weight||2.4 ounces|
|Product Dimensions||3.54 x 0.79 x 0.79 inches|
|Item model number||537.200.31|
|Size||SHK 5/16 | CD 20mm (25/32)|
|Item Package Quantity||1|
|Number Of Pieces||1|
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CMT 537.200.31 Forstner Bit, 20mm (25/32-Inch) Diameter, 8mm Shank
|Price:||& FREE Shipping|
|Item Dimensions LxWxH||3.54 x 0.79 x 0.79 inches|
|Shank Type||Round with Flats|
About this item
- Make sure this fits by entering your model number.
- 3-35/64-Inch Overall Length, Right-Hand Rotation.
- 2 spurs, 2 precision ground cutting edges, long-lasting cutting performance
- Drill precise flat bottom holes with no chipping in any thickness of soft wood
- For drilling holes in any direction and making arched openings
- For drilling partially overlapped flat bottom holes or niches used to fix supports
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|Sold By||Factory Direct Supply WPB||Amazon.com||PrecisionBits||Amazon.com||Meichoon||Meichoon|
|Item Dimensions||3.54 x 0.79 x 0.79 inches||9.5 x 4 x 1.25 inches||3.63 x 1.13 x 1.13 inches||0.78 x 0.79 x 3.54 inches||5 x 3 x 7 inches||5 x 3 x 7 inches|
Forstner bit featuring special alloyed steel body, precision balanced center point, 2 spurs, 2 precision ground cutting edges for long-lasting cutting performance. Use to drill precise flat bottom holes with no chipping in any thickness of soft wood. For drilling holes in any direction and making arched openings. For drilling partially overlapped flat bottom holes for easy mortising. For drilling niches used to fix supports.
Top reviews from the United States
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After drilling just 2 holes in a 2x4, 2" deep, in my drill press @ 1700rpm, using very little pressure, letting the bit do the work (what work it can do), clearing the shavings 5-6x per inch, and waiting 15min between each hole, this thing discolored from heat. It's pine, not hardwood, jeez. STEER CLEAR!
The Irwin bit I got from Lowes cuts 10x better, no exaggeration. Unfortunately Irwin doesn't make 15/16 or 24mm, so I exchanged this for an MLCS.
However, this is the perfect size for 3/4" conduit (making cheap lumber storage rack).
I attached some photos showing the packaging, and then this bit and a Freud 5/8" bit for comparison, with calipers readout.
As for the bit itself, it's not good.
I am not sure whether the exalted reviewers below got better samples than I have, but the one I received clogged up, bogged down, and overheated (to the point of discoloring the cutter on one side - but not the other - which means that it's likely off-center as well). This happened at the recommend RPM while babying the bit through the piece. The Freud bit, by comparison, just barreled through the same piece of Douglas fir, at much faster RPM and didn't even get hot to the touch.
I suspect the CMT bit simply lacks the precision grind that's a must for forstner bits. Lastly, even though CMT is an Italian company, the packaging leaves no clues as to where it was manufactured.
For $20 this Fisch bit: Fisch FSA-134558 Wave Cutter Forstner Bit, 16mm x 8mm is a lot better. It is made in Austria, the grind is very high quality and performance is *almost* as good as Freud's Precision Shear bits.
I decided to rate the CMT as 3-star, because for $8 it will get the job done - and with enough precision for those who need a 16mm hole, but if you make those a lot, get the Fisch one instead.
Here's where the problems began. This darn thing lasted so long, I ended up getting about 400 of the holes drilled before it started to show it was getting dull! This had the adverse affect of giving me WAY too much time to drink beer in the garage and I missed dinner with the wife.
So, just be aware that you may get lost in time because the quality of this was outstanding and I totally didn't see the problem coming!!
I purchased this CMT 30mm bit to drill a custom router base to accept Porter Cable guide bushings. One hole in 3/8" thick acrylic. This is a odd sized hole that I didn't have in my shop.
The difference in the bits are; CMT bits are not face ground at all on the circumference of the bit! Instead of cutting the outside edge, heat buildup is produced, even at 200 rpm, producing a molted mess. I can only imagine the smoke this bit would make in hardwood.
The old adage still holds true. "You get what you pay for". This bit is no bargain. I wouldn't recommend it at all.
I bought this for a project I'm working on. I went to drill out the door (1.25" pine) and the bit wouldn't bite. I had to put a lot of pressure onto it and it would still not bore. It got too hot so I had to let it rest. I checked the bit and the machining is sloppy, marred, dull and hard to believe it is a cmt product at all. I haven't been this disappointed in a purchase for a long time. My entire months long project is on hold waiting for a 24mm forstner bit...
Beware! Do not buy!
Update: I emailed everyone I could about this item, even CMT directly to ask if this item was legit or not. Never heard back from anyone at Amazon or CMT. At this point I assume it is counterfeit or used and repackaged.
Of course, when it arrived, the package very clearly said 16mm. And 16mm is most definitely NOT the same as 41/64" ... in fact, 41/64" isn't even the closest standard US size to 16mm! (5/8" is) ... converting both to decimal inches, 16mm is 0.011" smaller than 41/64". That may not sound like much, but if I didn't care about the hole size I would've used a 5/8" bit from the local hardware store!
This isn't the first time I've been burned by misleading product descriptions on Amazon, and you'd think I would learn. Maybe someday ...
(4 stars is just a placeholder because I have no need for the bit but I want to be fair. I had the same description issue with another CMT bit that I bought at the same time, but I'm planning to use it because in that case 15mm is only 0.003" less than 19/32, so I think it will work. I'll adjust this rating based on the quality of that bit, if required.)
Top reviews from other countries
So this Forstner bit was the solution! the final holes fit the dogs nicelely
Reviewed in Italy on December 12, 2020