High-Accuracy Metric Core Drill Bits | Perfect Concentricity for Precision Engineering

Problem: The Cost of Secondary Finishing

Many industrial workshops suffer from "rough" holes. When a drill produces burrs or an inaccurate diameter, workers have to spend extra time deburring or reaming the hole so that bolts can fit. In high-precision assembly, a hole that is even 0.1mm out of round can lead to structural rejection and massive financial loss.

Cause: Vibration & Asymmetrical Cutting

Inaccurate holes are usually caused by asymmetrical grinding. If one cutting tooth is slightly higher than the others, the tool will "walk" or vibrate. This vibration creates a jagged surface finish and forces the hole to become oversized, making it impossible to achieve a precision fit.

Solution: Full CNC Multi-Cut Geometry

We manufacture our cutters using state-of-the-art 7-Axis CNC grinding centers. This ensures every tooth is perfectly symmetrical. Our unique Three-Stage Cutting Geometry shears the metal in layers, resulting in a mirror-like finish on the hole wall. The precision is so high that secondary deburring is almost never required.

Technical Parameters

• Manufacturing Process: 100% Fully CNC Ground

• Tooth Geometry: Triple-Edge (Internal, Middle, External)

• Diameter Accuracy: +0.02mm / -0.00mm

• Surface Finish: Ra 1.6 - 3.2

• Concentricity: <0.05mm

• Material: HSS-M2 / M35

Application: Precision Assembly & Custom Fabrication

This series is designed for aerospace ground equipment, custom automotive chassis work, and high-end architectural metalwork. It is the preferred choice for labs and medical device manufacturers where every thread and bolt-hole must be perfect.

Selection Guide

When the project specification calls for "Burr-Free" or "Precision Fit," this CNC Ground series is the only choice. It is particularly effective for thinner materials where "tearing" is a common problem with lower-quality cutters.

Professional FAQ

Q: Why does the hole look polished?

A: Our triple-edge geometry cuts the metal cleanly rather than ripping it, which results in a much smoother surface.

Q: Does this help with bolt alignment?

A: Absolutely. The perfect roundness ensures that bolts pass through multi-layered plates without resistance.

Q: Is the shank also ground?

A: Yes, the Weldon shank is precision ground to ensure zero-slip and perfect alignment in the drill chuck.