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BOSCH CO2143 1-Piece 1/4 In. x 4 In. Cobalt Metal Drill Bit for Drilling Applications in Light-Gauge Metal, High-Carbon Steel, Aluminum and Ally Steel, Cast Iron, Stainless Steel, Titanium
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Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
Material | Cobalt |
Finish Type | Uncoated |
Shank Type | 3-Flat |
Cutting Angle String | 135 Degrees |
Brand | BOSCH |
About this item
- Withstands high-temperature applications for extended periods of time (up to 1,100 degreeF)
- Rigid, thick web design adds stability to bit in tough applications
- Surface hardened to penetrate tough abrasive materials, Cuts through light gauge metal, high carbon steel, aluminum and alloy steel, cast iron and stainless steel
- Available in jobber length, full shank, Drill Point Angle is 135 degrees, Surface Coating is uncoated (bright finish), Bit type is Twist
- Best used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium
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Product details
- Item model number : CO2143
- Date First Available : July 2, 2004
- Manufacturer : Bosch
- ASIN : B000AESUF8
- Country of Origin : China
- Best Sellers Rank: #2,048 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
- #9 in Jobber Drill Bits
- Customer Reviews:
Product Description
Product Description
Jobber Drill Bit, Fractional Inch, Size 1/4 In., Decimal Equivalent 0.2500, Point Angle 135.00 Degrees , Material Cobalt Steel, Finish Uncoated, Coolant Through No, Overall Length 4 In., Cutting Direction Right Handed, Shank Dia. 1/4 In., Flute Length 2-3/4 In., Point Type Conventional Point. Bits that are 1/8 In. and larger feature a split point; bits 3/16 In. and larger feature a three-flat shank, for better bit grip.
From the Manufacturer
Bosch cobalt drill bits offer the best heat resistance and rigid thick web design for drilling in extremely hard and abrasive materials such as treated stainless steel (precipitation-hardened), cast iron and titanium.
From the brand
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Oscillating
The Bosch Starlock interface increases power transfer, providing extra support for efficient cutting through various materials.
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From the manufacturer
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Withstands high temperatureWithstands high-temperature applications for extended periods of time (up to 1,100°F) |
Long life4X the lifespan of standard metal drill bits |
Tough applicationsSurface hardened to penetrate tough abrasive materials |
Various assortmentAvailable in jobber length, full shank |
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Black Oxide for general purpose drilling(Also available at Impact Tough range) |
Titanium for heavy duty repetitive drilling(Also available at Impact Tough range) |
Cobalt for heavy duty drilling in extremely hard or abrasive materials |
Customer Reviews |
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Drill Bit Type | Cobalt | Cobalt | Black Oxide | Black Oxide | Titanium Drill Bit | Titanium Drill Bits |
Model Number | CO14 | CO21 | BL21A | BL29 | TI21A | TI29 |
# of Pieces | 14 | 21 | 21 | 29 | 21 | 29 |
What's in the box
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BOSCH Cobalt Drill Bits
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the value, material, quality and sharpness of the drill bit. For example, they mention it works well drilling aluminum, steel and most metals with ease, it's well made and stays sharp for a long time. That said, some say the size is perfect for 1/8 NPT tap and 8mm Helicoil tap.
AI-generated from the text of customer reviews
Customers are satisfied with the value of the drill bit. They mention it's a quality product, works great for their needs, and has a good price. Some say that the drills seem okay so far and have no issues. Overall, customers are happy with their purchase and recommend it to others.
"Surprisingly great drill bit. Still sharp after drilling numerous holes in hardened steel, and even drills through mild steel without a pilot hole." Read more
"Great quality and cheaper than buying at the store." Read more
"It is a nice long and narrow chisel. It's quality seems good, pretty strong without bending...." Read more
"...This was quick and easy. No issues at allMake sure you store it properly due to the sharp edges and size. Highly recommend!" Read more
Customers like the quality of the drill bit. For example, they mention it's dependable, tough, and lasts a long time. Some say that the bit was still intact after use and does what it claims.
"...after drilling numerous holes in hardened steel, and even drills through mild steel without a pilot hole." Read more
"Great quality and cheaper than buying at the store." Read more
"...It's quality seems good, pretty strong without bending.Materials wise it is as strong as some name brand ones. I recommend it." Read more
"...Several of the Milwaukee bits broke off and had to be re-shaped and sharpened. The extractors would NOT budge the broken bolt...." Read more
Customers like the sharpness of the drill bit. They say it stays sharp for a long time, cuts really well, and is durable. Some mention that the coating helps, but the drill is still sharp as a blade after some 20 1.5" plunges.
"Surprisingly great drill bit. Still sharp after drilling numerous holes in hardened steel, and even drills through mild steel without a pilot hole." Read more
"...After using them many many times, I just buy new ones.They cut really well and have a lot of use in them...." Read more
"...This bit cut through the cast iron and stayed sharp, unlike the three bits that dulled after a couple seconds of drilling..." Read more
"...Still sharp after drilling holes through 1/4 inch steel plate." Read more
Customers like the material of the drill bit. For example, they say it's durable, and works well drilling aluminum, steel, and other metals. Some mention that the bit works perfect and makes quick work of holes that dulled and burned up other bits.
"Has worked well with Aluminum metal" Read more
"It worked well on the metal legs of a chair and obviously good on wood...." Read more
"...Two styles of Milwaukee bits would not drill through (still ok for mild steel). I did not test Dewalt because I can't buy a single 15/64" bit." Read more
"...It drilled through it like butter, after my cheap harbor freight drill bit just sat on the surface making a hot divot instead of a hole...." Read more
Customers like the size of the drill bit. They mention it's sharp and true to size, and the perfect size for 1/8 NPT tap and 8mm Helicoil tap. It fits perfectly in their old case of bits and seems strong and durable. Some say that it'll fit their jobber drill index well. Overall, customers are satisfied with the size and quality of the bit.
"It is a nice long and narrow chisel. It's quality seems good, pretty strong without bending...." Read more
"...This drill bit is the perfect size with zero taper, so I know I'm safe. Definitely recommended for vinyl collectors...." Read more
"Size is pefect, quality is excellent. Not the harbor fr***ht crap." Read more
"...It is so hard to read the size of the drills that I simply can't do it in most cases...." Read more
Customers find the drill bit easy to use. They mention it drills in very nicely and without much effort. They also say it takes less time to drill each hole, and has a split point that offers fast, easy starts on contact. Customers say it's a great bit that saves them tons of labor.
"...My original one stopped working due to being too dull. This was quick and easy. No issues at all..." Read more
"...Hole drilled effortlessly!" Read more
"...smaller pilot, this listing shows "A split point offers fast, easy starts on contact with no walking or skating, eliminating the need for a center..." Read more
"...and have been impressed with Bosch quality, power, and usability with every time--until now...." Read more
Customers are mixed about the dullness of the drill bit. Some mention that it was sharp and true and didn't become dull despite binding several times. However, others say that it started to dull and not work as well.
"Plastic milk jug, bit is dull and requires an excessive amount of force to punch through...." Read more
"Only lasted one hole before becoming dull" Read more
"...Not like cutting butter, but the bit did the job without dulling. It's still sharp and ready for more." Read more
"...so I checked the tip with my finger and noticed that it's quite dull already. Being that it's super cheap, it's not even worth returning...." Read more
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Materials wise it is as strong as some name brand ones. I recommend it.
Make sure you store it properly due to the sharp edges and size. Highly recommend!
They seem to hold up much better than any other I have tried.
I don't bother to sharpen them.
After using them many many times, I just buy new ones.
They cut really well and have a lot of use in them.
I highly recommend and will buy more and more.
Top reviews from other countries
Price was great.