Measurement Precision & Tolerances

Bore gauges use a three-point or expanding-contact head to translate internal diameters to a dial or digital readout. Typical resolution is 0.01 mm with model variations offering finer sensitivity for precision bores. For best results, center the head and rock the gauge slightly to find the minimum reading point.

Calibration & Compliance

Calibration against ring gauges and internal master sets provides traceable accuracy. A calibration certificate from the CMM lab should accompany instruments used for contract inspection or supplier acceptance.

Processing Insight & Technical Notes

Ensure the bore is clean and free of chips. For deep bores, use extension rods and confirm concentric seating. Use temperature-controlled conditions when small tolerances are critical to avoid thermal expansion errors.

Applications & Use Cases

• Engine Components: Cylinder bore verification and finish inspection.
• Bearing Seats: Confirm seat diameters before press-fit assembly.
• Batch Sampling: QC sample checks during production runs to detect bore drift early.