High Speed Steel Step Drills
UNIBIT High Speed Steel Step Drills

High Speed Steel Step Drills

Made In The USA
Item #: 01-906-041
Brand: UNIBIT
Size Type: Metric
Size Range: 20mm to 34mm by 2mm
No. of Holes: 8

Master Catalog Listing

Need a different size, length or brand?

View Product Group Page
Up to 13 different hole sizes without changing bits

Applications

  • Specialty step drill designed to machine a large number of different hole diameters with a single tool.
  • Single cutting edge creates perfectly round holes in metal, plastic, and wood without center punching.
  • For use with thin materials.
  • Two general variations are available for either self-starting holes or for enlarging existing holes.
  • Single flute design helps to ensure perfectly round holes in a wide range of ferrous, non-ferrous and non-metallic materials.

Features

  • Right hand (clockwise rotation) cutting direction.
  • Multi-step design with progressively larger holes.
  • Self-starting or hole enlarging styles.
  • Straight shank diameters of 1/4", 3/8" or 1/2" (6.5mm, 10mm, or 13mm).
  • Conical design permits as many as 13 different size holes to be drilled with one drill.
  • These drills, depending on the model, have a step 1/8" to 3/8" (3.5mm to 11mm) thick between sizes.
  • 20 different models are available to produces holes from 1/8" to 1-3/8" or 4mm to 35mm.
  • The hardened, high speed steel drill body is available in either an uncoated style or with a TiN coating for longer life in tougher materials.
Cobalt
  • M35 grade provides high heat & abrasion resistance.
  • Longest cutting life.
  • 6 times longer life vs. competition.

Technical Data

  • 1/8" to 3/8" (3.5mm to 11mm) step thicknesses.
  • Cylindrically ground from the solid.
  • Bright finish.
UNIBIT HSS Metric Hole Enlarging Bit Step Drill
Product Specifications
Brand UNIBIT
Size Type Metric
Size Range 20mm to 34mm by 2mm
No. of Holes 8
Finish Coating Bright
Model # 21M
Drilling Capacity 20mm to 34mm by 2mm
Flute Shape Straight Flute
Hardness 58 to 60 RC
Manufacturing Method Ground from the solid
No. of Flutes Single Flute
OC_Steel X
Overall Length N/A
Pilot Hole Required 18mm
Prop. 65 Yes
Shank Diameter 13mm
Shank Size 13mm
Size 20mm to 34mm by 2mm
Shank Style Straight Shank
Step Thickness 5mm
Tool Material High Speed Steel
Type High Speed Steel Step Drills
Weight 0.5 lbs.
Country of Origin UNITED STATES OF AMERICA
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.