Custom drill bits are ordered when catalogue drills cannot meet depth, tolerance, chip control, or tool-life requirements. Use this checklist to get a fast quote and predictable results.
Custom drill bits are not only “special sizes”. They are often built to solve a process problem: chip packing, heat, hole straightness, or tool breakage in stainless, titanium, or deep holes. A good RFQ defines the drilling conditions so the geometry and coolant strategy match your actual cut.
RFQ Checklist for Custom Drill Bits
- Diameter, depth, and required flute length (include any clearance constraints).
- Material and hardness; whether the hole is cross-drilled or interrupted.
- Coolant: flood vs through-coolant; pressure/flow available at the machine.
- Point style: split point, flat-bottom, forming profile, or customer-specific.
- Hole tolerance and surface finish requirements; reaming after drilling or not.
Coolant-Through vs Flood: A Practical Rule
When chip evacuation is the limiting factor (deep holes, gummy materials, long flute lengths), through-coolant typically stabilises the process. For shallow holes, flood coolant and optimized geometry may be enough.
Related Products — Drills
Through-coolant drills engineered for deeper drilling and stable chip evacuation.
Production carbide drills for standard depth ratios with reliable hole quality.
Replaceable-tip systems for larger diameters and predictable cost per hole.
Start here to choose the right baseline before customizing.
Real Cases
See deep drilling and coolant-through examples: https://solidcarbidedirect.com/custom-tooling-cases
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