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BOSCH CO2135 1-Piece 1/8 In. x 2-3/4 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 6,743 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
Cutting Diameter 0.13 Inches
Finish Type Steel
Shank Type 3-Flat
Cutting Angle String 135 Degrees

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
  • Available in jobber length, full shank
  • 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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$1.69
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 0.15 x 1.8 x 5.8 inches; 0.32 ounces
  • Item model number ‏ : ‎ CO2135
  • Date First Available ‏ : ‎ July 28, 2017
  • Manufacturer ‏ : ‎ Bosch
  • ASIN ‏ : ‎ B000AEVY24
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.7 4.7 out of 5 stars 6,743 ratings

Product Description

Product Description

BOSCH cobalt drill bits are specially designed for drilling in hard steel. Thick web helix delivers fast material removal combined with increased durability for maximum efficiency and performance. Each bit is manufactured to exacting specifications and features a split point that starts on contact with no walking or skating, eliminating the need for a center punch.

From the Manufacturer

The Bosch line of metal drill bits offers a solution for every professional application. Each bit is manufactured to exacting specifications and features a 135 Degree split point that starts on contact with no walking or skating, eliminating the need for a center punch.


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

  • Bosch CO2135 1/8 In. x 2-3/4 In. Cobalt Drill Bit
  • Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    6,743 global ratings

    Customers say

    Customers like the size, quality, sharpness, material and value of the drill bit. For example, they mention it's true to size, holds up fine, stays sharp for a long time and that it works well drilling aluminum, steel and most metals with ease. That said, some are happy with the price and quality of the product.

    AI-generated from the text of customer reviews

    389 customers mention357 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.

    "Great quality and cheaper than buying at the store." Read more

    "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

    "Fast shipping and delivery. Worked great for my needs." Read more

    "It is a nice long and narrow chisel. It's quality seems good, pretty strong without bending...." 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.

    "Great quality and cheaper than buying at the store." Read more

    "...after drilling numerous holes in hardened steel, and even drills through mild steel without a pilot hole." 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

    37 customers mention27 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

    "...It is so hard to read the size of the drills that I simply can't do it in most cases...." Read more

    "Size is pefect, quality is excellent. Not the harbor fr***ht crap." Read more

    18 customers mention18 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

    "...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

    "...The starting point went in well and that was it. At least I now had more than a dent but still no holes. Project stalled...." Read more

    22 customers mention7 positive15 negative

    Customers are mixed about the dulling 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

    "...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

    "...It does dull quickly though. After about a dozen holes through steel, it started to dull and not work as well. But that's to be expected." Read more

    "NoSkate Tip" mite not be true for steel
    5 Stars
    "NoSkate Tip" mite not be true for steel
    $2.19 BOSCH CO2134 7/64 I did not buy for this, but the middle right package says "NoSkate Tip, TM" (no image of that on this web listing but I posted one), I took a metal washer from home depot like .97” OD x .435” ID to test drilling steel, it skated all over place looks like those vibrating engravers, so then I had to center punch .045” diameter dimple and it did not skate and I got some metal curls drilling half way thru so it does drill metal yet no pilot hold so good, rated 5* overall anyway, the pkg dont say to predrill 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 punch." Of course pine wood was easy. Lower price than HomeDepot same $3.97 or $4.27 Milwaukee, $5.47 Dewalt stocked locally.
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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 16, 2024
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    Reviewed in the United States on January 27, 2024
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    Reviewed in the United States on February 10, 2024
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    Reviewed in the United States on November 21, 2023
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    Reviewed in the United States on November 11, 2023
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    One person found this helpful
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    Reviewed in the United States on February 22, 2024
    Size: 7/64" x 2-5/8"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