Mitutoyo 515-311 Calibration Master 0.2 to 12.2 in

Product Description

The MITUTOYO 515-311 is a staggered-step calibration master designed for setting and verifying bore gauges and internal measuring instruments. It covers a measurement range of 0.2 to 12.2 inches with an accuracy of 0.00005 inches and a graduation of 0.00001 inches, making it suitable for precision metrology environments where tight tolerances are non-negotiable. Constructed from cast iron, the 515-311 delivers the dimensional stability required for repeatable calibration work. The unit ships with a protective carrying case. This tool is handled by metrology technicians and quality control professionals in machine shops, manufacturing facilities, and calibration labs.

The 515-311 is used to calibrate and set bore gauges, dial bore gauges, and similar internal measuring tools across a wide range of diameters from 0.2 to 12.2 inches. Its staggered-step design allows the user to reference multiple ring-equivalent diameters from a single master, reducing the number of individual setting rings required on the bench. It is well suited to production metrology, incoming inspection, and periodic gauge calibration programs in both light and heavy manufacturing environments.

Key Features

• Measurement range of 0.2 to 12.2 inches covers a broad span of internal gauge sizes
• Accuracy of 0.00005 inches supports high-precision calibration and verification work
• Graduation of 0.00001 inches for fine resolution when setting internal measuring instruments
• Staggered-step configuration consolidates multiple reference diameters into one master unit
• Cast iron construction provides long-term dimensional stability
• Includes protective carrying case for storage and transport

Compatibility

Designed as an OEM-specification calibration master for use with bore gauges and internal measuring instruments requiring ring-gauge-style setting references within the 0.2 to 12.2 inch range.

Installation Notes

Calibration masters should be handled and stored by qualified metrology or quality control personnel following established gauge care procedures. Allow the master to thermally stabilize at the measurement environment temperature before use, as cast iron is subject to thermal expansion. Keep the reference surfaces clean and free of debris using appropriate gauge cloths and approved cleaning agents. Store in the supplied case when not in use to protect reference surfaces from damage.