Mitutoyo 155-123 Telescoping Gage 3/4 to 1-1/4 Inch

Product Description

The MITUTOYO 155-123 is a telescoping gage designed for measuring inside diameters, bores, and slots with a measurement range of 3/4 to 1-1/4 inches. The gage features a satin chrome finish that reduces glare and resists corrosion during regular shop use. With an overall length of 4.3307 inches, it is compact enough for use in tight bore access conditions. Machinists, quality technicians, and toolroom professionals use this gage in conjunction with an outside micrometer to transfer precise internal measurements for reading. It is a standard hand-tool in precision metrology and machine shop workflows.

This telescoping gage is suited for inspecting bored holes, housing bores, and cylindrical inside dimensions in manufacturing and maintenance environments. It is appropriate for both production floor and toolroom inspection tasks where direct-reading internal measurement tools are not practical. The 3/4 to 1-1/4 inch range covers a common bore size category found in light machinery, engine components, and precision assemblies. Installation or use requires no power source, making it practical for bench or in-machine measurement tasks.

Key Features

• Measurement range of 3/4 to 1-1/4 inches covers common bore and inside diameter sizes
• Overall length of 4.3307 inches for access in moderate-depth bore applications
• Satin chrome finish reduces glare and provides corrosion resistance in shop environments
• Telescoping plunger design locks in position for accurate micrometer transfer measurement
• Compact, lightweight construction at 0.1 pounds for comfortable single-hand use

Compatibility

Designed as a standard telescoping gage for use with any outside micrometer calibrated to read the transferred measurement within the 3/4 to 1-1/4 inch range.

Installation Notes

Telescoping gages require no installation and are used as handheld transfer measurement instruments. Compress and lock the telescoping contact points inside the bore at the correct depth and angle before withdrawing and reading with a calibrated outside micrometer. Keep the gage clean and lightly oiled to maintain smooth plunger action and accurate measurement transfer. Verify calibration of the micrometer used for reading according to your shop quality control standards.