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CMT 537.200.31 Forstner Bit, 20mm (25/32-Inch) Diameter, 8mm Shank

Brand: CMT

692 ratings

Price:

$10.22 & FREE Shipping

Material	Heat-Treated
Brand	CMT
Item Dimensions LxWxH	3.54 x 0.79 x 0.79 inches
Shank Type	Round with Flats

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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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Customer ratings by feature

Sheerness

4.5

Accuracy

4.4

Packaging

4.1

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Customer Rating	(692)	(44)	(141)	(858)	(640)	(160)
Price	$10.22	$22.10	$16.95	$15.40	$25.99	$12.99
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

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Product description

Size:SHK 5/16 | CD 20mm (25/32)

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.

Product information

Size:SHK 5/16 | CD 20mm (25/32)

Technical Details

Manufacturer

CMT

Part Number

537.200.31

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)

Style

Drill

Material

Heat-Treated

Item Package Quantity

Number Of Pieces

Batteries Included?

Batteries Required?

Additional Information

ASIN

B000P4NNV4

Customer Reviews

692 ratings

4.5 out of 5 stars

Best Sellers Rank

#19,191 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#11 in Forstner Drill Bits

Date First Available

April 3, 2007

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer reviews

5 star		74%
4 star		14%
3 star		5%
2 star		3%
1 star		5%

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Top reviews from the United States

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Jerz_Subbie

BEWARE: Deceptive Picture, Poor Quality

Reviewed in the United States on September 10, 2016

Size: SHK 5/16 | CD 24mm (61/64)Verified Purchase

The 24mm version does NOT have teeth like the picture shows, is not very sharp, and therefore had trouble drilling into a pine 2x4, pretty sad!
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).

21 people found this helpful

Helpful

K F

It is a proper 16mm bit - but not a very good one

Reviewed in the United States on July 19, 2018

Size: SHK 5/16 | CD 16mm (41/64)Verified Purchase

So yes, as the previous reviewer noted, the description of this bit is deceptive. People who created this listing (or any other that pertain to metric bits, screws, nuts etc) should NOT have added a fractional "equivalent" into the title because, aside from few very special cases, they won't be "close enough".

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.

3 people found this helpful

Helpful

John H.

This bit just may bite you! Be Careful!!

Reviewed in the United States on September 21, 2017

Size: SHK 5/16 | CD 25mm (63/64)Verified Purchase

So, be careful when using this project if you have a big job. It can get you into trouble. I had to drill about 500 holes for some railing and wasn't sure what size to get. I bought two sizes thinking I would reorder the right size to finish the job because it would probably go dull.

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!!

7 people found this helpful

Helpful

Mark T

30mm CMT Forstner Bit

Reviewed in the United States on October 9, 2019

Size: SHK 5/16 | CD 30mm (1-3/16)Verified Purchase

What is the difference between a $8.00 CMT bit and a Freud $17.00 bit? Plenty!
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.
One hole.....
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.

2 people found this helpful

Helpful

ATT

Bit is sloppy, marred, dull and hard to believe it is a cmt product at all

Reviewed in the United States on September 27, 2018

Size: SHK 5/16 | CD 24mm (61/64)Verified Purchase

This bit has to be either used and reground or counterfeit.

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.

2 people found this helpful

Helpful

Greg G

Read the description closely ... this is not a 41/64 bit!

Reviewed in the United States on April 26, 2017

Size: SHK 5/16 | CD 16mm (41/64)Verified Purchase

Yes, this is mostly on me, I should have read the product description more closely. I searched for a 41/64" bit, selected this one because it was a forstner and had good reviews, and bought it (along with one other, see below).

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.)

One person found this helpful

Helpful

Top reviews from other countries

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GZ woodworkers

David Garza

Reviewed in Mexico on January 26, 2017

Size: SHK 5/16 | CD 18mm (23/32)Verified Purchase

This Forstner bit well deserves 5 stars!! I must confess that I was surprised when I found it because of the very low price! Usually CMT tools are expensive, very fine tools but the cost is proportional to that, except in this case. It makes very clean holes and the precision of the holes is nice also. I was looking for an 8 mm bit to make dog holes on my workbench surface and the 3/4 bench dogs commercially available are not really 3/4" diameter (I have the Kreg KKS1070 dogs), so drilling holes with a 3/4 regular bit will make them fit a bit loose, considering the drill bit will do have 3/4" and it tends to open a little bit more!
So this Forstner bit was the solution! the final holes fit the dogs nicelely

One person found this helpful

Francesco

Pessima affilatura....

Reviewed in Italy on December 12, 2020

Size: SHK 5/16 | CD 25mm (63/64)Verified Purchase

Sulla confezione c'è scritto affilatura di precisione.... Non mi sembra proprio! Non pretendo l'affilatura come quella di una fresa, ma così mi sembra troppo. Proverò a chiedere la sostituzione e vedremo cosa arriva (fino ad ora i prodotti CMT non mi hanno mai deluso). Altrimenti cambierò prodotto.

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Gianfranco

Punta da 10mm

Reviewed in Italy on April 26, 2019

Size: SHK 5/16 | CD 10mm (25/64)Verified Purchase

Non è il primo prodotto CMT che acquisto, e questa punta tipo Forstner da 10mm è ottima. Taglio pulito, meglio se fatto a più riprese per non scaldate i taglienti che allungano la loro durata. Acquistata per montare giunzioni a barilotto. Sono pienamente soddisfatto dell'utensile che consiglio sicuramente l'acquisto. Spedizione veloce.

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Armando GR

Excelente compra.

Reviewed in Mexico on August 27, 2019

Size: SHK 3/8 | CD 3/4Verified Purchase

La compré por el precio, me gustó tanto como las freud o las irwin, muy buen marca, no la había utilizado y me ha gustado. Deja cortes precisos y rápidos,. usada a las revoluciones que es, es una excelente herramienta . recomendable.,

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Luigi R.

Poco affilata

Reviewed in Italy on January 8, 2021

Size: SHK 5/16 | CD 15mm (19/32)Verified Purchase

La punta si è rivelata poco affilata ed i buchi, specialmente in uscita, non sono puliti. Onestamente da una Fostner di marca mi aspettavo qualcosina di più. E' utilizzabile ma ne dovrò comprare un'altra perché l' affilatura purtroppo non è il massimo.

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CMT 537.200.31 Forstner Bit, 20mm (25/32-Inch) Diameter, 8mm Shank

About this item

Customer ratings by feature

Consider this Amazon's Choice product that delivers quickly

Frequently bought together

Customers who viewed this item also viewed

What other items do customers buy after viewing this item?

Special offers and product promotions

Have a question?

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Product description

Product information

Technical Details

Additional Information

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