Custom carbide drills are often ordered to solve deep-hole chip evacuation and heat. This post covers coolant-through, flute length, point styles, and what to include in your RFQ.
Custom carbide drills are used when depth ratio, material, or hole quality requires more than a standard twist drill. For deep holes, the question is usually not “can it cut”, but “can it evacuate chips and control heat for the full depth without breakage”.
RFQ Checklist for Custom Carbide Drills
- Diameter, depth, and required flute length; any clearance constraints.
- Through-coolant requirement and available coolant pressure/flow.
- Material and hardness; interrupted features or cross holes.
- Point style (split point, flat-bottom, forming) and tolerance targets.
Why Coolant-Through Matters for Deep Holes
Through-coolant delivers pressure at the cutting edge, improving chip evacuation and thermal control. It is especially valuable in long flute designs where flood coolant cannot reach the cutting zone effectively.
Related Products — Drills
Through-coolant drills for deeper holes and stable chip evacuation.
Production drill families for standard depth ratios.
Replaceable-tip drilling for larger diameters and cost control.
Compare drill families and decide what must be customized.
Custom Tooling Real Cases
Deep drilling examples and workshop photos: https://solidcarbidedirect.com/custom-tooling-cases
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