Rough Boring vs Fine Boring Head Technology for Precision CNC Machining

June 10, 2026

Boring: The Final Frontier of Precision

When tolerances are measured in microns, boring heads are indispensable. Rough boring heads maximize material removal (IT9-IT10) while fine boring heads deliver ultimate precision (IT6-IT7, Ra 0.4um).

Rough Boring Heads

Multi-insert design, 0.2-0.5 mm/rev feed, up to 6mm depth per side. Best for engine cylinder bores, gearbox housings, and heavy equipment.

Fine Boring Heads

Single-point micrometer adjustment, 0.05-0.15 mm/rev feed. Best for aerospace, precision hydraulic components, and mold finishing.

Comparison

Parameter	Rough Boring	Fine Boring
Tolerance	IT9-10	IT6-7
Surface Finish	Ra 1.6-3.2	Ra 0.4-0.8
Insert Count	2-4	1
Feed	0.2-0.5 mm/rev	0.05-0.15 mm/rev

Workflow

Drill initial hole
Rough bore (leave 0.3-0.5mm)
Semi-finish (optional)
Fine bore to final spec

Ansprechpartner :	Selly
Telefon :	86-13566629430

In Kontakt kommen

Nr. 1-3, 1. Stock, Gebäude 8, Ningbo Industrial Internet (Vico) Industrial Park, Yangfan Road, Ningbo High-Tech-Zone

buen@vip.163.com

86-13566629430

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