Mitutoyo 155-125 Telescoping Gage 2-1/8 to 3-1/2 in

Product Description

The MITUTOYO 155-125 is a telescoping gage designed to measure inside diameters, bore sizes, and internal slot widths with precision. The gage features a satin chrome finish and spans a measurement range of 2-1/8 inches to 3-1/2 inches, with an overall length of 5.9055 inches. After the telescoping contact is locked in position within the bore, the measurement is transferred to an outside micrometer for a final reading. This tool is commonly used by machinists, maintenance technicians, and quality control inspectors working on engines, hydraulic cylinders, pump housings, and similar precision-fit components.

This telescoping gage is suited for workshop and field use where internal bore measurements fall within the 2-1/8 to 3-1/2 inch range. Typical applications include verifying bore tolerances during engine rebuilds, checking housing fits during pump or motor assembly, and confirming internal dimensions on machined parts. The satin chrome finish reduces glare and resists corrosion, making it practical in both shop and light industrial environments.

Key Features

• Measurement range of 2-1/8 to 3-1/2 inches for internal bore and slot gauging
• Overall length of 5.9055 inches for access into moderate-depth bores
• Satin chrome finish resists corrosion and minimizes surface glare
• Lock mechanism holds the telescoping contact at the measured position for transfer to a micrometer
• Lightweight at 0.1 pounds for easy single-hand operation

Compatibility

Designed as a standard telescoping gage for use with any outside micrometer capable of reading within the 2-1/8 to 3-1/2 inch range.

Installation Notes

Telescoping gages are used by machinists and precision measurement technicians and require no installation in the traditional sense. Compress the telescoping contacts, insert into the bore at a slight angle, allow the contacts to expand against the bore wall, then lock the spindle and withdraw the gage. Transfer the locked measurement to a calibrated outside micrometer. Avoid forcing the contacts into bores smaller than the minimum range, as this can damage the locking mechanism.