CNC Turning: What Tolerances and Finishes Can You Hold on Rotational Parts?

What We Hold on Your Parts

Every number above is what we hold on your parts — CMM-verified, with free FAI on your first order.

Tolerance±0.005 mm on critical diameters
Surface finishRa 0.8–1.6 μm (grinding to Ra 0.4)
Size rangePrototype to production — send your drawing for a machine-envelope check
MaterialsAluminum 6061/7075, stainless 303/304/316, Ti-6Al-4V, brass, PEEK/POM
EquipmentCNC turning centers, turn-mill, Swiss-type
Batch1–10,000+ (prototype to production)
InspectionCMM, FAI report with measured values

From our historical RFQ data, around 70% of incoming part requests fall within 1–100 pieces. We support both prototype batches and volume production with no minimum-order requirement. Submit your drawing for feasibility evaluation.

Frequently Asked Questions

  • What tolerance can CNC turning hold on diameters?

    ±0.005 mm on critical diameters, verified on a CMM with full report. General dimensions run at ±0.05–0.1 mm unless specified.

  • When should I choose turn-mill instead of turning?

    Parts with rotation plus off-axis features — cross holes, keyways, milled flats — are done in one setup on a turn-mill, avoiding transfer error between machines.

  • Can you machine thin-wall bushings without distortion?

    Yes. Thin-wall parts use controlled clamping and finishing passes so roundness holds within specification — CMM report included.

  • How does batch size affect turning price?

    Setup and programming dominate small batches; from 50 pieces the unit price drops 40–60% as setup cost spreads. No MOQ.

  • What surface finish is standard after turning?

    Ra 0.8–1.6 μm as standard; grinding reaches Ra 0.4 μm where required.

Have a Similar Part in Mind?

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