High Speed Steel Standard Step Drill Counterbore
TTC PRODUCTION High Speed Steel Standard Step Drill Counterbore - Tool Material: High speed steel   Cutting Direction: Right hand   SCREW LENGTH : 3/8-16   Overall Length : 5-7/8   Step Length: 1   FLUTE LENGTH : 4-3/8

High Speed Steel Standard Step Drill Counterbore

Item #: 01-905-110
For Use With: For Taps
Screw Size: 3/8"-16
Application: For Taps

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For Cap Screws
  • Drills cap screw clearance holes.
  • Does 2 jobs in a single pass.
  • Can be sharpened repeatedly.
  • Modified for any special length-of-step.
For Taps
  • Drills 45° chamfered holes to be tapped (to produce approximate 70% thread).


  • Designed for drilling mounting holes for socket-head cap screws.
  • The dual cutting diameters produce holes properly sized for each size screw.
  • The two styles available permit the holes to be drilled for both through holes and tapped holes. The through hole style produces holes with a body diameter slightly larger than the major diameter of the screw. The tapped hole type drills holes with the diameter needed for tapping the holes to approximately 70% thread. Both types also produce a counterbored area correctly sized for the screw head.
  • Suitable for a range of ferrous and non-ferrous metals and alloys, and non-metallic materials.
  • The cutting lengths are sufficient to permit repeated sharpenings.
  • For optimal performance and the best tool life, suitable lubricating/cutting oils or the appropriate coolant fluids are recommended.


  • Right hand (clockwise rotation) cutting direction.
  • Standard two flute design.
  • Standard spiral, helical flutes.
  • Cuts both body and counterbore diameters in a single pass.
  • Straight shanks that corresponds to the drill diameter.

Technical Data

  • Ground from the solid.
  • Cylindrically ground.
  • Permits repeated sharpenings.
  • Bright finish.
TTC 3/8"-16 HSS Jobbers Step Drill Counterbore for Taps-45° Chamfer
Product Specifications
For Use With For Taps
Screw Size 3/8"-16
Application For Taps
Cutting Direction Right Hand
Finish Coating Bright Finish
Flute Shape Standard Spiral, Helical Flute
Hardness 58 to 60 RC
Major Diameter 31/64"
Minor Diameter .316"
No. of Flutes 2
Overall Length 5-7/8"
Prop. 65 Yes
Shank Type Straight Shank
Step Length 1"
Tool Material High Speed Steel
Type High Speed Steel Standard Step Drill Counterbore
Weight 0.2188 lbs.
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.