Mitutoyo 155-122 Telescoping Gage 1/2 to 3/4 in

Product Description

The MITUTOYO 155-122 is a telescoping gage designed to measure inside diameters, bores, and slots with a minimum measurement of 0.5 inches and a maximum measurement of 0.75 inches. The gage features a satin chrome finish that reduces glare and resists corrosion in shop environments. With an overall length of 4.3307 inches, it is sized for precise transfer measurements in tight spaces. Machinists, tool-and-die technicians, and precision maintenance mechanics use this gage alongside an outside micrometer to capture bore dimensions accurately. It is a standard instrument in quality-control and dimensional inspection workflows.

This telescoping gage is suited for measuring small bores and internal diameters in the 0.5 to 0.75 inch range. Typical applications include inspecting cylinder bores, bearing housings, bushings, and machined holes in both production and maintenance settings. It is used in light manufacturing, machine shops, and precision assembly operations where transfer gaging is the preferred method for inside-diameter measurement.

Key Features

• Measurement range from 0.5 inches to 0.75 inches for small-bore applications
• Overall length of 4.3307 inches for access in confined bore depths
• Satin chrome finish reduces glare and improves corrosion resistance
• Telescoping spring-loaded contact for consistent feel and repeatable transfer readings
• Compatible with standard outside micrometers for final dimensional readout

Compatibility

Designed as a standard transfer-gaging instrument for inside-diameter measurement in the 0.5 to 0.75 inch range, compatible with any outside micrometer used to read the transferred dimension.

Installation Notes

Telescoping gages are handled and used by machinists and dimensional inspection technicians — no installation in the traditional sense applies. Before use, ensure the gage and the bore being measured are at the same ambient temperature to minimize thermal expansion error. Lock the telescoping plunger only when the gage is properly seated and aligned in the bore. Always clean the contact faces and the bore surface before measuring to prevent debris from affecting the transferred reading.