standard

Metric Router Bit Shank Sizes (Quick Reference)

This page provides standardized, specification-oriented reference information.

Specifications

Specification	Value
Common Metric Shanks	6mm, 8mm, 12mm
Notes	Match the shank to the exact collet size; do not mix close sizes (e.g., 6mm vs 1/4 inch).

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Last updated: February 23, 2026