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
15D DIN 6537 Carbide Coolant-Thru Drills
These are German DIN 6537 standard-size coolant-through carbide drills. At 15× diameter, this drill enters territory typically reserved for gun drills or BTA deep-hole systems — but at a fraction of the setup complexity. Purpose-engineered for crankshaft oil passages, long tie bolts, and heat-exchanger tube sheets. Full-diameter internal coolant delivery is mandatory.
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Applications
Crankshaft oil passages · Long tie bolts · Heat-exchanger plates · Deep mould cooling features
Feed-In Method
Use a dedicated pilot hole, low runout holder, and controlled feed-in. Once guided, run steady feed with no dwell.
Pilot Hole
Required. Pilot hole quality controls entry accuracy and tool life at this depth ratio.
Coolant Requirement
Internal coolant at 50-70 bar with stable flow is recommended; verify filtration for small diameters.
15D DIN 6537 SKU Range
Complete 15D DIN 6537 Coolant-Thru Drill Sizes
Ultra deep — crankshaft passages, long tie bolts, heat exchangers
| CUTTER DIA (D1) h7 | FLUTE LENGTH (L2) | SHANK DIA (D2) h6 | OVERALL LENGTH (L1) | Price | SKU PAGE | |
|---|---|---|---|---|---|---|
| 3.00 | 0.1181 | 55.00 | 4.00 | 95.00 | $18.62 | Details |
| 3.50 | 0.1378 | 55.00 | 4.00 | 95.00 | $18.62 | Details |
| 4.00 | 0.1575 | 71.00 | 4.00 | 109.00 | $22.89 | Details |
| 4.50 | 0.1772 | 93.00 | 6.00 | 133.00 | $40.06 | Details |
| 5.00 | 0.1969 | 105.00 | 6.00 | 145.00 | $44.37 | Details |
| 5.50 | 0.2165 | 105.00 | 6.00 | 145.00 | $44.37 | Details |
| 6.00 | 0.2362 | 110.00 | 6.00 | 148.00 | $45.84 | Details |
| 6.50 | 0.2559 | 120.00 | 7.00 | 162.00 | $58.36 | Details |
| 7.00 | 0.2756 | 120.00 | 8.00 | 162.00 | $67.71 | Details |
| 7.50 | 0.2953 | 137.00 | 8.00 | 180.00 | $75.94 | Details |
| 8.00 | 0.3150 | 137.00 | 8.00 | 180.00 | $75.94 | Details |
| 8.50 | 0.3346 | 160.00 | 10.00 | 204.00 | $114.64 | Details |
| 9.00 | 0.3543 | 160.00 | 10.00 | 204.00 | $114.64 | Details |
| 9.50 | 0.3740 | 175.00 | 10.00 | 221.00 | $124.52 | Details |
| 10.00 | 0.3937 | 175.00 | 10.00 | 221.00 | $124.52 | Details |
| 10.50 | 0.4134 | 198.00 | 12.00 | 247.00 | $179.76 | Details |
| 11.00 | 0.4331 | 198.00 | 12.00 | 247.00 | $179.76 | Details |
| 11.50 | 0.4528 | 213.00 | 12.00 | 263.00 | $191.83 | Details |
| 12.00 | 0.4724 | 213.00 | 12.00 | 263.00 | $191.83 | Details |
| 12.50 | 0.4921 | 248.00 | 14.00 | 297.00 | $289.55 | Details |
| 13.00 | 0.5118 | 248.00 | 14.00 | 297.00 | $289.55 | Details |
| 13.50 | 0.5315 | 248.00 | 14.00 | 297.00 | $289.55 | Details |
| 14.00 | 0.5512 | 248.00 | 14.00 | 297.00 | $289.55 | Details |
| 14.50 | 0.5709 | 258.00 | 16.00 | 313.00 | $395.79 | Details |
| 15.00 | 0.5906 | 258.00 | 16.00 | 313.00 | $395.79 | Details |
Process Notes
What to Confirm Before Running 15D
Feed-In
Use a dedicated pilot hole, low runout holder, and controlled feed-in. Once guided, run steady feed with no dwell.
Pilot Hole
Required. Pilot hole quality controls entry accuracy and tool life at this depth ratio.
Cooling
Internal coolant at 50-70 bar with stable flow is recommended; verify filtration for small diameters.
RFQ Data
Send the drawing, coolant pressure, diameter, depth, material hardness, coating target, and annual demand.
RFQ Checklist
Quote 15D 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