Multi-Step-Bohrer
Tools for metalworking – cutting tools

Hartner Multi-Step Drills
Precision reimagined. Efficiency made tangible. Made in Germany.
The multi-step drills are the intelligent further development of classic HSS and HSS-E twist drills. Thanks to their innovative step-drill geometry, the drills deliver significantly higher performance, greater precision, and noticeably improved drilling comfort in daily use.
What makes the multi-step drill so special? Unlike conventional HSS drills that machine material in a single cutting action, the multi-step drill works in several defined cutting stages. The result is smooth, low-vibration operation with significantly lower force requirements.
Additional advantages include optimal chip removal, perfectly round and precise holes, and almost burr-free hole exits. Even when used with hand drills and cordless drills, the special geometry enables controlled drilling without jamming or slipping in the drill chuck.

Advantages of Multi-Step Drills at a Glance
Step-tip geometry for extremely smooth drilling performance
Fastest drilling progress with minimal effort required
Clean, dimensionally accurate holes – almost burr-free
Optimized split-point geometry for precise centering
3-flat shank for secure grip in the drill chuck
Ideal for steel, stainless steel, aluminum, non-ferrous metals, plastics & wood
Perfect for use with hand drills, cordless drills, pillar drills, bench drills and CNC machines
Technical Design & Innovation Features
Multi-stage cutting structure (up to 6 steps)
Chip division into small individual chips
Excellent chip evacuation
Narrow chip width at the outer diameter
Low-burr drilling results
Optimized starting-drill behavior
Small pilot-drilling diameter
Drilling and enlarging in one working step
Especially for thin-walled sheet metal, the required force is significantly reduced because the first drilling stage exits the material early
118° Point Grind with Optimized Cross-Point Geometry
Low feed forces required
Exclusive step-drill point grinding
Even chip volume at every step
Decreasing diameter increments from tip to shank
Optimized flute profile for perfect chip formation
Extremely stable tool design, suitable for demanding and heavy-duty applications
3-flat shank – maximum safety, prevents slipping in the chuck
Protection against damage
Material & Finish
HSS with special heat treatment for long service life
Excellent cost-performance ratio
Multi-step drill in HSS-E version
Even higher wear resistance
Ideal for demanding materials
Improved lubricant retention
Universal use also in non-ferrous materials

Technical Data
Precision ground
Diameter range: 1–13 mm
DIN 338 dimensions
3-flat shank from Ø 4.00 mm
Step geometry from Ø 2.50 mm
Optimized cross-point from Ø 1.00 mm
Application Areas:
Suitable for hand drills, pillar drills, bench drills and CNC machines
Ideal For:
Through holes in sheet metal & flat materials
Hollow aluminum and window profiles
Blind holes
Drilling on round or slanted surfaces (e.g., pipes)
Enlarging existing holes
Drilling out bolts and rivets
Suitable For Use In:
Steel < 1200 N/mm²
Cast materials
Aluminum and other non-ferrous metals
Plastics and wood

Available as Multi-Step HSS and HSS-E Sets for Workshop & Assembly:
Multi-Step Drill Set HSS from 1 mm to 10 mm in 0.5 mm steps – 19 drills per case
Multi-Step Drill Set HSS from 1 mm to 19 mm in 0.5 mm steps – 25 drills per case
Multi-Step Drill Set HSS-E from 1 mm to 10 mm in 0.5 mm steps – 19 drills per case
Multi-Step Drill Set HSS-E from 1 mm to 19 mm in 0.5 mm steps – 25 drills per case

Conclusion
With the Hartner Multi-Step Drills, you can drill faster, cleaner, and more controlled than with conventional HSS drills. A real upgrade for any toolbox – ideal for installers, craftsmen, and maintenance, repair, and servicing operations.