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KEO 53512 Cobalt Steel Single-End Countersink, Uncoated (Bright) Finish, 82 Degree Point Angle, Round Shank, 5/16" Shank Diameter, 1/2" Body Diameter

4.7 4.7 out of 5 stars 547 ratings
#1 Best Seller in Single End Countersinks
$19.99 with 18 percent savings
List Price: $24.29

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Purchase options and add-ons

Material Cobalt Steel
Cutting Diameter 0.45 Inches
Finish Type Uncoated
Shank Type Round
Cutting Angle String 82 Degrees

About this item

  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • 82 degree angle

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KEO 53512 Cobalt Steel Single-End Countersink, Uncoated (Bright) Finish, 82 Degree Point Angle, Round Shank, 5/16" Shank Diam
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3 x 0.5 x 0.5 inches; 0.01 ounces
  • Item model number ‏ : ‎ 53512
  • Date First Available ‏ : ‎ November 9, 2004
  • Manufacturer ‏ : ‎ KEO Cutters
  • ASIN ‏ : ‎ B00947BQ08
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.7 4.7 out of 5 stars 547 ratings

Product Description

KEO ZErO flute countersink and deburring tools are simple, all-purpose tools made of Cobalt that provide flawless countersinking and deburring. The chatter-free cutting action requires minimal power. The microsmooth CNC precision ground construction produces clean, smooth cutting without smearing on a variety of materials. The tool especially excels in countersinking or deburring holes in aluminum, plastics and other nonmetallics. Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. 82 degree angle.

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
547 global ratings

Customers say

Customers like the performance, quality and ease of sharpening of the drill bit. For example, they mention it works well, produces smooth results and is well made. That said, some appreciate the appearance, cleanliness and value of the product.

AI-generated from the text of customer reviews

53 customers mention51 positive2 negative

Customers are satisfied with the performance of the drill bit. They mention that it works well, produces superior results, and is easy to use. Some say that it is an oddly shaped tool that works great and produces precise results. They also say that the tool works quickly and smoothly.

"...Very smooth countersinks in wood. Worked a lot better then the previous countersink I had (purchased from a home improvement store)." Read more

"...Worked great - nice and smooth results." Read more

"...This bit was the ticket in hard maple, worked quickly and very smooth and easy to control. Highly recommended." Read more

"This tool works great. It cut nice and clean on walnut. It is well made and looks the part...." Read more

48 customers mention48 positive0 negative

Customers are satisfied with the quality of the drill bit. They mention it's well-made, solid, and American-quality. They also say it'll do an awesome job with no chatter. Customers also say the countersinks are flawless, much better than traditional countersinking, and a durable tool.

"...No signs of wear. In most cases this is exactly what is needed...." Read more

"This tool works great. It cut nice and clean on walnut. It is well made and looks the part...." Read more

"So these are definitely better than a regular countersink and are very high quality. BUT they do not cut well!!..." Read more

"...When I first opened it, I wasn't expecting much, but it did great against red oak. Would purchase again." Read more

45 customers mention42 positive3 negative

Customers find the sharpening process of the drill bit to be easy. They mention that it produces super smooth, clean, and precise results in wood. Some say that the bit makes a fine smooth tapered hole.

"Works really really well, excellent design! Very smooth countersinks in wood...." Read more

"...Worked great - nice and smooth results." Read more

"This countersink cuts a clean, uniform counterbore. I have used it for more than a year in wood mostly, some soft steel. No signs of wear...." Read more

"...This bit was the ticket in hard maple, worked quickly and very smooth and easy to control. Highly recommended." Read more

26 customers mention26 positive0 negative

Customers are satisfied with the appearance of the drill bit. They mention that it looks the part, is well-made, and produces a professional looking result. Some say that the bit produces beautiful clean cuts and that it produces fewer chatter marks than other multi-flute drill bits.

"Works really really well, excellent design! Very smooth countersinks in wood...." Read more

"...Worked great - nice and smooth results." Read more

"...It cut nice and clean on walnut. It is well made and looks the part...." Read more

"I have used this in plywood and hardwood (walnut) so far. It makes gorgeous, clean countersinks in pre-drilled holes...." Read more

18 customers mention18 positive0 negative

Customers are satisfied with the chattering of the drill bit. They mention that it does not chatter when drilling the countersink, works with very little chatter, and produces an excellent finish with no chatter marks. Some say that it works on steel, brass, aluminum, and other metals.

"Nice smooth countersink in mild steel, no chatter" Read more

"...super smooth sidewalls on wood and soft metals and does not chatter when drilling the countersink." Read more

"...This makes for an excellent finish with no chatter marks. Just buy it." Read more

"This is a solid countersink, it does an awesome job with no chatter from a drill press, I haven't used it with a drill yet" Read more

15 customers mention15 positive0 negative

Customers are satisfied with the cleanliness of the drill bit. They mention that it makes very clean countersinks, and that the cutting edge provides a clean/crisp countersinking. They also say that it leaves very clean holes with little effort.

"This tool works great. It cut nice and clean on walnut. It is well made and looks the part...." Read more

"...countersink bits with a drill directly attached but this provides a much cleaner result...." Read more

"...It makes gorgeous, clean countersinks in pre-drilled holes. I literally said "Wow" out loud to nobody the first time I used it in plywood...." Read more

"...I've never used a countersink which produces such perfectly smooth, clean and precise results in wood and plastic, every time...." Read more

10 customers mention7 positive3 negative

Customers like the value of the drill bits. They say it's worth the price.

"...The price was also reasonable.I am now a believer - at least in soft aluminum, it does a great job. Glad I bought it." Read more

"...Because of its low cost and long life I will definitely buy the same one again." Read more

"Smooth as silk. Worth the money over cheaper 'rosette' type cutters...." Read more

"...At this small size, it is extremely expensive! I won't get it again." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the holes in the drill bits. They mention that the holes are clean, smooth, and sharp. Some say that the countersink holes and splitters are cleaned at the same time.

"...This one, with the sharp circular hole, is a design achievement." Read more

"...It works very smoothly and predictably. Nice clean holes, no chatter." Read more

"...Holes are smooth and the tool shows no wear." Read more

"So nice to get nice countersink holes and splitters cleaned at same time!" Read more

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Top reviews from the United States

Amazon Customer
5.0 out of 5 stars Awesome countersink
Reviewed in the United States on February 19, 2024
Verified Purchase
Works really really well, excellent design! Very smooth countersinks in wood. Worked a lot better then the previous countersink I had (purchased from a home improvement store).
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Amazon Customer
5.0 out of 5 stars Worked great on hardwood
Reviewed in the United States on January 23, 2024
Verified Purchase
Used this on holes in a maple butcher block tabletop before putting in threaded inserts. Worked great - nice and smooth results.
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John Peterson
5.0 out of 5 stars A quality product.
Reviewed in the United States on August 27, 2023
Verified Purchase
This countersink cuts a clean, uniform counterbore. I have used it for more than a year in wood mostly, some soft steel. No signs of wear. In most cases this is exactly what is needed.
Just today I did need to use a standard fluted countersink to do a moderate clean-up of some holes I had drilled in plastic sheet. I didn't need a counterbore but rather to clean away the material that had pushed up around the edge of the holes. The KEO 53512 would not do what I needed since it does not begin cutting until engaged more than 1/16" deep.
3 people found this helpful
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Greenebro
5.0 out of 5 stars Easy to control very smooth cut. This is the best counter sink only bit I’ve ever used.
Reviewed in the United States on May 12, 2023
Verified Purchase
I’m a woodworker and needed a countersink for a 1/2” screw head and none of my standard drill-bit countersink combo but were large enough for the 1/2” head. I had a more conventional countersink only bit but it left a lot of chatter on the surface of the cut that looked terrible. This bit was the ticket in hard maple, worked quickly and very smooth and easy to control. Highly recommended.
2 people found this helpful
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Thomas Gifford
4.0 out of 5 stars Quality tool but shavings do not clear easily.
Reviewed in the United States on September 27, 2022
Verified Purchase
This tool works great. It cut nice and clean on walnut. It is well made and looks the part. My only minor gripe is that the shavings always end up in the hole in the middle. After a few holes I have to use something to push them out.
One person found this helpful
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East Breeze
5.0 out of 5 stars Good Tool
Reviewed in the United States on July 1, 2023
Verified Purchase
Nice smooth countersink in mild steel, no chatter
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David C
5.0 out of 5 stars Great bit!
Reviewed in the United States on June 10, 2023
Verified Purchase
This bit worked great for me! Does exactly as advertised.
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Mth44
5.0 out of 5 stars Better than it looks
Reviewed in the United States on October 17, 2023
Verified Purchase
I have other countersink bits with a drill directly attached but this provides a much cleaner result. Harder you push the deeper the countersink, followed Blacktail Studio for this kind of bit
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