Spi 15-450-0 Telescoping Gage 3.5 to 6 Inch Range

Product Description

The SPI 15-450-0 is a telescoping gage designed to transfer internal bore measurements to an outside micrometer or caliper for accurate indirect measurement. The gage spans a range of 3.5 to 6 inches and features a 12-inch overall handle length for reach into deep bores or counterbores. Constructed from hardened tool steel with a satin chrome finish, the 15-450-0 is built to withstand shop-floor use and resist corrosion. Machinists, toolmakers, and precision measurement technicians use this type of gage when direct measurement with a bore gauge is impractical or when matching to a specific micrometer reading is required.

This telescoping gage is suited for measurement tasks in machine shops, maintenance facilities, and precision manufacturing environments. It is commonly used to measure cylinder bores, bearing housings, pipe fittings, valve bodies, and similar round or oval internal features. The 3.5 to 6 inch range covers many standard industrial bore sizes encountered in general mechanical work. The 12-inch handle provides additional reach for deeper workpieces where a shorter gage would not seat properly.

Key Features

• Measurement range: 3.5 to 6 inches
• 12-inch overall handle length for access to deep bores
• Hardened tool steel construction for durability and dimensional stability
• Satin chrome finish reduces glare and resists corrosion
• Indirect measurement design — transfer reading to outside micrometer or caliper for final measurement

Compatibility

Designed as a general-purpose telescoping gage compatible with standard shop measurement workflows requiring an outside micrometer or caliper for final bore reading in the 3.5 to 6 inch range.

Installation Notes

Telescoping gages require no installation but should be used by a qualified machinist or technician familiar with indirect measurement technique. Ensure the gage is fully seated and locked at a consistent angle before transferring to the micrometer to minimize measurement error. Clean the contact tips and bore surface before use to avoid false readings caused by debris or burrs. Store the gage in its case when not in use to protect the hardened tips and finish.