CNC grinding: end mills, drills & special cutters
See how we use a CNC grinder to make carbide end mills, drills and special cutters.
Watch on YouTubeDIN 6537 Standard Sizes · Coolant-Thru Drill Depth Ratio
20D DIN 6537 Carbide Coolant-Thru Drills
These are German DIN 6537 standard-size coolant-through carbide drills. The 20D coolant-thru drill replaces two-step gun-drilling in many automotive and power-generation applications. Suitable for hardened steel (up to HRC 40) and nickel alloys when combined with the correct Balzers PVD coating. Machine spindle runout must be within 0.005mm for consistent tool life.
20xD carbide drillhardened steel deep holepower generation drillingprecision deep hole drill
Applications
Power-generation parts · Hardened steel deep holes · Nickel-alloy components · Automotive oil passages
Feed-In Method
Use a precision pilot and a very rigid setup. Ramp gently into the pilot, then keep continuous feed and coolant pressure.
Pilot Hole
Required. Pilot geometry, concentricity, and runout should be treated as part of the process, not an optional step.
Coolant Requirement
Internal coolant at 60-80 bar is recommended, with high filtration quality and enough flow for chip evacuation.
20D DIN 6537 SKU Range
Complete 20D DIN 6537 Coolant-Thru Drill Sizes
Precision deep hole — hardened steel, nickel alloys, power generation
| CUTTER DIA (D1) h7 | FLUTE LENGTH (L2) | SHANK DIA (D2) h6 | OVERALL LENGTH (L1) | Price | SKU PAGE | |
|---|---|---|---|---|---|---|
| 3.00 | 0.1181 | 70.00 | 4.00 | 110.00 | $22.78 | Details |
| 3.50 | 0.1378 | 91.00 | 4.00 | 129.00 | $28.45 | Details |
| 4.00 | 0.1575 | 91.00 | 4.00 | 129.00 | $28.45 | Details |
| 4.50 | 0.1772 | 118.00 | 6.00 | 158.00 | $49.04 | Details |
| 5.00 | 0.1969 | 118.00 | 6.00 | 158.00 | $49.04 | Details |
| 5.50 | 0.2165 | 134.00 | 6.00 | 172.00 | $54.46 | Details |
| 6.00 | 0.2362 | 134.00 | 6.00 | 172.00 | $54.46 | Details |
| 6.50 | 0.2559 | 162.00 | 7.00 | 200.00 | $74.73 | Details |
| 7.00 | 0.2756 | 162.00 | 8.00 | 200.00 | $86.27 | Details |
| 7.50 | 0.2953 | 184.00 | 8.00 | 222.00 | $96.58 | Details |
| 8.00 | 0.3150 | 184.00 | 8.00 | 222.00 | $96.58 | Details |
| 8.50 | 0.3346 | 205.00 | 10.00 | 249.00 | $141.81 | Details |
| 9.00 | 0.3543 | 205.00 | 10.00 | 249.00 | $141.81 | Details |
| 9.50 | 0.3740 | 227.00 | 10.00 | 271.00 | $155.10 | Details |
| 10.00 | 0.3937 | 227.00 | 10.00 | 271.00 | $155.10 | Details |
Process Notes
What to Confirm Before Running 20D
Feed-In
Use a precision pilot and a very rigid setup. Ramp gently into the pilot, then keep continuous feed and coolant pressure.
Pilot Hole
Required. Pilot geometry, concentricity, and runout should be treated as part of the process, not an optional step.
Cooling
Internal coolant at 60-80 bar is recommended, with high filtration quality and enough flow for chip evacuation.
RFQ Data
Share machine spindle runout, holder type, coolant pressure, material, hole tolerance, and inspection requirement.
RFQ Checklist
Quote 20D DIN 6537 coolant-thru drills faster
- Diameter list and quantities
- Work material and hardness
- Hole depth, blind/through condition, tolerance
- Coolant pressure, filtration, machine/toolholder
- Coating preference and annual quantity
FROM OUR WORKSHOP
Watch us grind and inspect our tools
Two videos filmed in our workshop: CNC tool grinding and dimensional inspection.
Measuring carbide end mills at 0.001 mm
Watch our ZOLLER inspection process for precision carbide end mills.
Watch on YouTube