For 8D, 12D, 15D and longer holes, coolant-thru carbide drills improve chip evacuation, heat control and tool life. This guide explains what Japanese buyers should specify before ordering.
Deep hole drilling fails quickly when chips stay in the flute or heat concentrates near the cutting edge. Coolant-thru carbide drills deliver coolant directly to the cutting zone, improving evacuation and reducing edge damage.
When to choose coolant-thru carbide drills
- Hole depth is 8D or longer, especially 12D, 15D, 20D or 25D.
- The work material is stainless steel, alloy steel, cast iron or difficult automotive material.
- Chip packing causes unstable hole size, poor surface finish or sudden drill breakage.
- Production needs repeatable tool life rather than only the lowest tool price.
Specifications to send for a reliable quote
A good quote needs more than diameter. Japanese buyers should send hole depth, through or blind hole, tolerance, machine coolant pressure, holder type, work material and expected monthly quantity.
| Depth ratio | Typical use | Buying note |
|---|---|---|
| 3D / 5D | General production drilling | Standard solid drills may be enough if coolant is stable |
| 8D / 12D | Automotive, mold base and fixture work | Internal coolant usually improves stability |
| 15D / 20D / 25D | Deep hole production and long reach holes | Geometry, runout and coolant pressure become critical |
Deep hole drilling products
For deep hole drill selection, send the drawing, material, machine model and coolant pressure. We can recommend a standard or custom coolant-thru drill.
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coolant thru drill Japandeep hole carbide drillinternal coolant drillstainless steel drilling油穴付きドリル深穴加工 ドリル