Deep Hole Drilling

Deep Hole Drilling delivers critical precision for high-performance industrial components — yet extreme L/D ratios create unique manufacturing challenges.

At Dongguan Coniro Tech Co., Ltd., we overcome obstacles including tool deflection, chip evacuation, coolant management, tight tolerance control and difficult-to-machine alloys.

Our process leverages rigid machinery, specialised tooling and optimised high-pressure coolant systems to achieve:
✅ Bore straightness & reliable concentricity
✅ Tolerance class IT6–IT8
✅ Surface roughness down to Ra 0.8 μm
✅ Machining depth up to 2000 mm+ with minimum bore Ø5 mm

We serve Aerospace, Hydraulics, Oil & Gas, Automotive, Industrial Automation and Medical Device sectors with ultra-precision deep hole drilled components.

Have a project requiring deep bore work? Send over your engineering drawing for a detailed manufacturability review & competitive quotation within 24 hours.