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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

4.7 4.7 out of 5 stars 6,758 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Jobber Drill Bits by BOSCH

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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
  • Customer Reviews:
    4.7 4.7 out of 5 stars 6,758 ratings

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


From the manufacturer

Withstands high temperature

Withstands high-temperature applications for extended periods of time (up to 1,100°F)

Long life

4X the lifespan of standard metal drill bits

Tough applications

Surface hardened to penetrate tough abrasive materials

Various assortment

Available in jobber length, full shank

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
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

  • Unit^Instruction Guide
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    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    6,758 global ratings

    Customers 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

    391 customers mention359 positive32 negative

    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

    213 customers mention167 positive46 negative

    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

    123 customers mention102 positive21 negative

    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

    117 customers mention82 positive35 negative

    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

    38 customers mention28 positive10 negative

    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

    19 customers mention19 positive0 negative

    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

    23 customers mention7 positive16 negative

    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

    Worked great!
    5 Stars
    Worked great!
    I used this to drill out a broken zerk fitting on my dump trailers equalizer bolt. Not sure what grade of steel the bolt was , but this drill bit cut through it like a hot knife in butter . Then I was able to Heil coil it and save the bolt .
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    Top reviews from the United States

    Reviewed in the United States on March 15, 2024
    Size: 3/8" x 5"Number of Items: 1Verified Purchase
    Reviewed in the United States on March 22, 2024
    Size: 17/64" x 4-1/8"Number of Items: 1Verified Purchase
    Customer image
    5.0 out of 5 stars Worked great!
    Reviewed in the United States on March 22, 2024
    I used this to drill out a broken zerk fitting on my dump trailers equalizer bolt. Not sure what grade of steel the bolt was , but this drill bit cut through it like a hot knife in butter . Then I was able to Heil coil it and save the bolt .
    Images in this review
    Customer image Customer image Customer image
    Customer imageCustomer imageCustomer image
    Reviewed in the United States on January 27, 2024
    Size: 15/64" x 3-7/8"Number of Items: 1Verified Purchase
    Reviewed in the United States on February 10, 2024
    Size: 11/64" x 3-1/4"Number of Items: 1Verified Purchase
    Reviewed in the United States on November 21, 2023
    Size: 1/2" x 6"Number of Items: 1Verified Purchase
    Reviewed in the United States on November 11, 2023
    Size: 1/8" x 2-3/4"Number of Items: 1Verified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on March 16, 2024
    Size: 1/16" x 1-7/8"Number of Items: 1Verified Purchase
    Reviewed in the United States on January 31, 2024
    Size: 1/16" x 1-7/8"Number of Items: 1Verified Purchase

    Top reviews from other countries

    BA
    5.0 out of 5 stars Replaced a bit I broke in my set
    Reviewed in Canada on March 18, 2024
    Size: 11/64" x 3-1/4"Number of Items: 1Verified Purchase
    Steven Hocevar
    5.0 out of 5 stars Very Good Drill Bit
    Reviewed in Canada on March 14, 2024
    Size: 9/64" x 2-7/8"Number of Items: 1Verified Purchase
    Melbert
    5.0 out of 5 stars works great all the time
    Reviewed in Canada on February 11, 2024
    Size: AssortedNumber of Items: 21Verified Purchase
    Donny
    5.0 out of 5 stars 5 stars!
    Reviewed in Canada on January 21, 2024
    Size: 13/64" x 3-5/8"Number of Items: 1Verified Purchase
    Bob fowler
    5.0 out of 5 stars Perfect
    Reviewed in Canada on August 30, 2023
    Size: 9/32" x 4-1/4"Number of Items: 1Verified Purchase