Mitutoyo 155-903 Telescoping Gage Set 6 Piece

Product Description

The MITUTOYO 155-903 is a 6-piece telescoping gage set covering a measurement range of 5/16 to 6 inches, designed for accurately transferring internal bore and hole dimensions to an outside micrometer. The set features a satin chrome finish that reduces glare and resists corrosion during regular shop use. Each gage uses a spring-loaded plunger mechanism that locks in place to hold the measured dimension. Machinists, tool-and-die workers, and quality control technicians use this set to measure cylinder bores, bushings, and other internal diameters where direct micrometer access is not practical.

This set is suited for use in machine shops, manufacturing floors, and maintenance environments where precise internal measurements are required. The 6-piece configuration spans a wide range from 5/16 to 6 inches, allowing a single set to cover most common bore sizes encountered in general machining and inspection work. The included fitted pouch keeps the gages organized, protected, and ready for bench or field use.

Key Features

• 6-piece set covers 5/16 to 6 inches internal measurement range
• Satin chrome finish reduces glare and provides corrosion resistance
• Spring-loaded, lockable plunger transfers bore dimensions to a micrometer
• Overall length adjusts between approximately 4.33 inches and 5.91 inches per manufacturer specs
• Includes fitted pouch for organized storage and transport

Compatibility

Designed for use with standard outside micrometers in general machining, inspection, and maintenance applications requiring internal bore measurement.

Installation Notes

Telescoping gages are hand tools and require no installation. A licensed machinist or quality technician should clean bore surfaces before use to ensure accurate measurement transfer. After locking the plunger, the gage dimension should be read using a calibrated outside micrometer. Do not force the plunger mechanism or use the gages as pry tools, as this can damage the locking mechanism and compromise measurement accuracy.