DIN 6537 Standard Sizes · Coolant-Thru Drill Depth Ratio
25D DIN 6537 Carbide Coolant-Thru Drills
These are German DIN 6537 standard-size coolant-through carbide drills. The deepest ratio in the standard range. The 25D coolant-thru drill is specified for aerospace structural drilling, long-reach cooling holes in injection moulds, and medical implant manufacturing. Requires a high-pressure coolant system (≥60 bar) and a machining centre with minimal thermal growth. Custom geometries available on request.
Applications
Aerospace structural holes · Long mould cooling channels · Medical implant features · Maximum-depth precision drilling
Feed-In Method
Use a precision pilot, rigid fixturing, and conservative feed-in. Confirm the process on sample parts before scaling production.
Pilot Hole
Required. Use a matched pilot drill and verify pilot depth, diameter, and alignment before the 25D tool enters.
Coolant Requirement
Internal coolant at 60-80 bar is normally required. Flow stability and filtration are critical at this depth.
25D DIN 6537 SKU Range
Complete 25D DIN 6537 Coolant-Thru Drill Sizes
Maximum depth — aerospace, mould cooling, medical implants
| ĐƯỜNG KÍNH CẮT (D1) h7 | CHIỀU DÀI SỢI (L2) | CHÂN DIA (D2) h6 | CHIỀU DÀI TỔNG THỂ (L1) | Price | TRANG MÃ HÀNG | |
|---|---|---|---|---|---|---|
| 3,00 | 0.1181 | 85,00 | 4,00 | 117,00 | 26,28 US$ | Chi tiết |
| 3,50 | 0.1378 | 116,00 | 4,00 | 148,00 | 34,89 US$ | Chi tiết |
| 4,00 | 0.1575 | 116,00 | 4,00 | 148,00 | 34,89 US$ | Chi tiết |
| 4,50 | 0.1772 | 145,00 | 6,00 | 183,00 | 58,42 US$ | Chi tiết |
| 5,00 | 0.1969 | 145,00 | 6,00 | 183,00 | 58,42 US$ | Chi tiết |
| 5,50 | 0.2165 | 170,00 | 6,00 | 210,00 | 67,74 US$ | Chi tiết |
| 6,00 | 0.2362 | 170,00 | 6,00 | 210,00 | 67,74 US$ | Chi tiết |
| 6,50 | 0.2559 | 197,00 | 7,00 | 237,00 | 89,53 US$ | Chi tiết |
| 7,00 | 0.2756 | 197,00 | 8,00 | 237,00 | 103,21 US$ | Chi tiết |
| 7,50 | 0.2953 | 220,00 | 8,00 | 260,00 | 113,98 US$ | Chi tiết |
| 8,00 | 0.3150 | 220,00 | 8,00 | 260,00 | 113,98 US$ | Chi tiết |
| 8,50 | 0.3346 | 250,00 | 10,00 | 294,00 | 168,99 US$ | Chi tiết |
| 9,00 | 0.3543 | 250,00 | 10,00 | 294,00 | 168,99 US$ | Chi tiết |
| 9,50 | 0.3740 | 277,00 | 10,00 | 321,00 | 185,29 US$ | Chi tiết |
| 10,00 | 0.3937 | 277,00 | 10,00 | 321,00 | 185,29 US$ | Chi tiết |
Process Notes
What to Confirm Before Running 25D
Feed-In
Use a precision pilot, rigid fixturing, and conservative feed-in. Confirm the process on sample parts before scaling production.
Pilot Hole
Required. Use a matched pilot drill and verify pilot depth, diameter, and alignment before the 25D tool enters.
Cooling
Internal coolant at 60-80 bar is normally required. Flow stability and filtration are critical at this depth.
RFQ Data
Send full drawing, hole depth, entry/exit condition, machine/coolant data, material, tolerance, coating, and annual quantity.
RFQ Checklist
Quote 25D 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