A coolant drill (coolant-through drill) pushes coolant directly to the cutting edge to improve chip evacuation and thermal stability. This guide explains when to use coolant-through and what to specify.
A coolant drill typically refers to a coolant-through drill: internal channels deliver coolant at the cutting edge under pressure. The benefit is process stability—chips evacuate more reliably and heat is managed at the source, which reduces tool breakage and hole quality drift in deeper holes.
When Coolant-Through is Worth It
- Deeper holes (higher depth ratios) where chips pack in the flutes.
- Tough or gummy materials (stainless, some alloys) where heat and built-up edge are problems.
- Long flute tools or long overall length drills.
- Production holes where stability matters more than minimum tool cost.
What to Specify in Your RFQ
- Diameter and depth ratio; required flute length and OAL.
- Available coolant pressure and filtration quality.
- Material and hardness; through vs blind holes.
- Point style and tolerance targets.
Need coolant-through drills for your depth and material?
Related Products — Coolant-Through Drills
Real Cases
Coolant-through examples and workshop photos: https://solidcarbidedirect.com/custom-tooling-cases
Tags
coolant drillcoolant through drillcarbide coolant thru drillsdeep hole drillingchip evacuationhole qualitycustom carbide drillsfactory direct