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KEO 24040 4B Long 60° High Speed Steel Combination Drill & Countersink

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Item #
  • Brand: KEO
  • Type: Long
  • Industry Standard Type: Number
  • Industry Standard: 4B
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Product Specifications
More Information
Brand KEO
Overall Length 4"
Finish Coating Bright
Tool Material High Speed Steel
Point Sharpening Type 1/8"
Industry Standard 4B
Included Angle 60°
Type Long
Model # 24040
Industry Standard Type Number
Drill Diameter 1/8"
Body Diameter 5/16"
First Choice For: Steel
Hardness 58 to 60 RC
OC_Wood X
Prop. 65 Yes
Series A195L-60
Trigger Sync No
Weight 0.075 lbs.
Workpiece Material Range Steel, Non-Ferrous, Cast Iron, Plastics

Prop 65 Warning

Many metalworking products do contain metals that are included in the latest Prop 65 warning. Exposure to the elements can be harmful. May cause cancer and reproductive harm.

Get that Extra Reach with Long Series HSS Combined Drills & Countersinks from KEO. With this unique double-ended tool design, machinists can save on valuable tool change time. High-Speed Steel body construction can withstand extreme industrial conditions. The tool's purpose is mainly to drill and enlarge the opening of a hole on a wide range of workpiece materials including Steel, Stainless Steel, Non-Ferrous, Cast Iron, producing a flat bottom for a socket-head screw to fit flush with the surface. This tool can be simultaneously used to remove the burr on the drill hole for safety and/or optical reasons. The selection of the right countersink angle depends on the application and works well with low cutting speed. KEO offers combined drills & countersinks in standard sizes of included angles 60° for specific applications. The bright-finished, round shank body comes in 8 different diameter sizes. This long series, HSS combined drills & countersinks from KEO is offered in 27 different industry standards of 1 A-D, 2 A-D, 3 A-D, 4 A-D, 4-1/2 A-C, 5 A-C, 6 A-C, 7A, 8A. KEO is a popular brand from ARCH Cutting Tools which is based in the United States. The companies core values revolve around driving the renaissance in American precision machining. In addition to a broad line of standard cutting tools, ARCH boasts of an experienced team of application specialists and custom tooling designers and rides on combined 100-plus years of design experience.


  • Long length provides extra reach over a conventional tool.
  • Great for 60° live centers.
  • The industry-best total runout for extreme accuracy at a fantastic price.
  • Better grind, exception finish and smoother edges.


  • Maintains accurate center holes on long production runs or when precise centering is required.
  • Can be readily attached to machine tools such as drill press, lathe, machining center, etc.
  • Countersinks are mainly used for countersinking drill holes, countersinking screws and deburring.
  • Countersinking tools are applied in grinding center holes, positioning holes, grinding holes, or deburring and rounding the edges after side-surface machining.
  • Ideally used as accurate center holes on a range of workpiece materials including Steel, Stainless Steel, Non-Ferrous, Cast Iron.


  • Double-ended, long series, straight shank Countersinking & Drill Tool.
  • Made from High-Speed Steel.
  • Tool included angle 60°.
  • Available in 27 Industry standards ranging from 1A to 8A.
  • Models available in longer tool lengths of 3-6 inches.
  • Drill diameter sizes of 3/64 inch, 5/64 inch, 7/64 inch, 1/8 inch, 9/64 inch, 3/16 inch, 7/32 inch, 1/4 inch, 5/16 inch.
  • Shank diameter fits drill chuck with sizes 1/8 inch, 3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch and 3/4 inch.


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