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Internet # 203530165

Model # CST1

1/2 in. Titanium Countersink Drill Bit

$9.31
  • Ideal for electrical, plumbing and HVAC contractors
  • Sharpening the cutting edges extends bit life
  • Superior cutting in iron, steel, soft metal, plastic and wood
  • View More Details
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Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

The self-starting point and five-fluted design on the Bosch 1/2 in. Titanium Countersink allow it to make clean, accurate cuts in even the toughest materials. It leaves smooth, burr-free edges on soft metal, steel, iron, wood and plastic with an 82-degree chamfer that creates a snug resting place for countersunk screw heads. Constructed with high-speed steel and coated with super-hard titanium, this bit has the durability to withstand high-heat conditions for lasting use.

Highlights

  • Perfect for de-burring holes and countersinking holes for flush or countersunk screw heads
  • Titanium coating reduces heat for balanced performance and longer life
  • Fluted design inhibits chatter and vibration for smooth operation
  • Produces a clean, burr-free edge
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Product Information

Internet # 203530165

Model # CST1

Additional Resources

Shop All Bosch

Specifications

Dimensions

Bit Diameter

1/2 in

Bit Length (in.)

3 in

Shank Diameter

1/4 in

Details

Bit Material

Titanium

Drill Bit Type

Countersink

Drill Bit Type(s) Included

Countersink

Individual/Set

Individual

Material Application

Wood

Number of Pieces

1 Piece

Number of Pieces

1

Returnable

90-Day

Shank Style

Straight

Tools Product Type

Power Tool

Questions & Answers

7Questions
caret
Q:What size countersink used for a 17/64" drilled hole in wood?
by|Mar 4, 2023
1 Answer
Answer This Question

A:  This CST1 countersink is 1/2 diameter is great for deburring and chamfering openings to pre-drilled holes that's for 1/2". If you are using a 17/64" straight bit, drilling in hardwood, the countersink size would be 3/4". For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST.

by|Mar 7, 2023
    caret
    Q:Could this drill perfect round holes on grade23 1/2"thickness titanium tubing ?
    by|Dec 17, 2017
    2 Answers
    Answer This Question

    A:  Thank you for your inquiry. The CST1 Counter Sink bit is used for deburring and chamfering openings to pre-drilled holes. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from M-F 7a-7p CST.

    by|May 5, 2023

      A:  I doubt it. I got a lot of chatter just countersinking #8 and #10 screw holes. And the resulting chamfered holes were not round. This is really not a drill. If you are trying to drill accurate, straight-sided holes through titanium, I'm thinking you need a good quality cobalt drill for use in a drill press or mill.

      by|Apr 22, 2021
      caret
      Q:How well will this bit work on concrete board,how long would it last.
      by|Jan 29, 2017
      2 Answers
      Answer This Question

      A:  I have used this on HardieBacker and re-pointed, then continued to use. Nothing holds up to concrete for any period of time without severe wear and dulling. If you want to counter sink, use Backer-on screws with a good impact driver. We now have a good impact driver and it is a breeze to flush out the Backer-on screws into the HardieBacker.

      by|May 6, 2023

      A:  Thank you for your question. The CST1 is designed for ferrous and non-ferrous metals only, not recommended for concrete board.

      by|May 4, 2023
        caret
        Q:Can this drill bit be used from deburring the ends of copper tubes?
        by|Dec 6, 2016
        2 Answers
        Answer This Question

        A:  Thank you for your question. We would recommend a deburring tool to debur copper tubes. The countersinks are used for drilling into material, it would not be able to debur the sides of the copper pipe.

        by|May 4, 2023

          A:  Yes, I think it would do that okay. But a single-flute HSS countersink would give better results. Especially if the tubing is small-diameter, as the HSS countersinks I bought come as small as 1/4" diameter.

          by|Apr 22, 2021
          Showing 1-4 of 7

          Customer Reviews

          4.7 out of 5

          • 4.7 out of 28 reviews
          • 86% recommend this product
          Filter by:
          Showing 1-10 of 28 reviews
          This countersink works great, leaves a nice smooth finish!
          by
          • Verified Purchase
          by
          • Verified Purchase
          Countersink for my wood shop, and many other projects.
          I have used to countersink wood screws into wood and plastic pipe, works great, and cuts good without having to use a lot of force.
          by
          • Verified Purchase
          • Recommended
          Pro: Great to use. Con: a bit expensive....
          Pro: Great to use. Con: a bit expensive.
          by
            I bought it primarily to countersink flathead screw holes in metal. I should have known better. I...
            I bought it primarily to countersink flathead screw holes in metal. I should have known better. It is multi-flute, so it chatters in aluminum and especially steel, and the resulting chamfer is irregular, not round. The titanium nitride coating also means it cannot be sharpened after the coating wears off. It did a good job in ABS and polycarbonate.I imagine it would do a nice job in wood also. But it is not all-purpose. I ended up buying single-flute HSS for metal.
            by
            • Pro
            • Verified Purchase
            3 found this review helpful
            It's nice but in hind sight, I'd like wider and...
            It's nice but in hind sight, I'd like wider and shallower Countersink bit.
            by
            • Verified Purchase
            used my bit to countersink some ultra polyethelene on my boat trailer. worked great.
            used my bit to countersink some ultra polyethelene on my boat trailer. worked great.
            by
            • Verified Purchase
            • Recommended
            The picture appears to show a single flute counter sink...
            The picture appears to show a single flute counter sink (what I wanted) but it is not.
            by
            Response from BoschToolsApr 1, 2021
            This CST1 Titanium Coated Countersink has 5 flutes. If this is not the one you need, kindly return it to Homedepot within 30 days from the date of purchased. You may also contact us at 1-877-267-2499. Thank you.
            • Verified Purchase
            by
            • Verified Purchase
            Beautiful divots in my birch hardwood......
            Beautiful divots in my birch hardwood...
            by
            • Verified Purchase
            Showing 1-10 of 28 reviews