Mitutoyo 155-121 Telescoping Gage 5/16 to 1/2 in

Product Description

The MITUTOYO 155-121 is a telescoping gage designed for measuring internal dimensions such as bores, holes, and slots. It features a spring-loaded plunger mechanism that locks in place to transfer the measured dimension to an outside micrometer or caliper for final reading. The measuring range spans 5/16 to 1/2 inch, and the tool has an overall length of 4.3307 inches. The satin chrome finish reduces glare and resists corrosion in shop environments. Machinists, toolmakers, and precision measurement technicians use this gage as part of standard bore inspection workflows.

This telescoping gage is suited for inspection and quality control tasks in machine shops, maintenance facilities, and manufacturing environments. It is used to measure internal diameters and slot widths within its 5/16 to 1/2 inch range. The compact overall length of 4.3307 inches makes it practical for accessing confined bores. It pairs with a standard outside micrometer to transfer and record final measurements.

Key Features

• Measuring range of 5/16 to 1/2 inch for small bore and slot applications
• Overall length of 4.3307 inches for access to shallow and confined bores
• Satin chrome finish resists corrosion and reduces light glare during use
• Spring-loaded, lockable plunger allows accurate dimension transfer to a micrometer
• Lightweight at 0.3 pounds for comfortable single-hand operation

Compatibility

Designed as an OEM-style precision measuring tool for use with standard outside micrometers capable of reading within the 5/16 to 1/2 inch range.

Installation Notes

Telescoping gages are used by machinists and quality control technicians and require no installation. To take a measurement, compress the plunger, insert the gage into the bore, allow the plunger to expand, then lock the spindle and withdraw carefully before reading with an outside micrometer. Keep the gage clean and lightly oiled to maintain accurate, repeatable readings. Do not force the plunger or use the gage beyond its stated measuring range.