Spi 15-446-8 Telescoping Gage 1/2 to 3/4 in 12 in

Product Description

The SPI 15-446-8 is a telescoping gage used to transfer inside diameter measurements to an outside micrometer or caliper for indirect bore measurement. The gage spans a range of 1/2 to 3/4 inch and features a 12-inch overall length handle, giving the technician reach into deeper bores and blind holes. The handle is constructed from hardened tool steel with a satin chrome finish for corrosion resistance and durability in shop environments. Machinists, tool-and-die workers, and maintenance technicians use this type of gage during precision bore inspection and engine or pump rebuilds.

This telescoping gage is suited for precision measurement tasks in machine shops, maintenance facilities, and production environments. It is used wherever a direct-reading bore gage is not available and an indirect transfer measurement to a micrometer is the preferred method. The 12-inch handle length makes it practical for measuring bores in deep housings, cylinders, and pump bodies where shorter gages cannot reach the measurement zone.

Key Features

• Measurement range of 1/2 to 3/4 inch for small-bore applications
• 12-inch overall handle length provides reach into deep or recessed bores
• Hardened tool steel construction for long service life under repeated use
• Satin chrome finish resists corrosion and reduces glare during use
• Spring-loaded plungers lock in position for accurate transfer measurement

Compatibility

Designed as a standard telescoping gage for use with outside micrometers and calipers capable of reading in the 1/2 to 3/4 inch range.

Installation Notes

Telescoping gages are installed by a machinist or precision measurement technician and require no permanent mounting or wiring. Compress the plungers, insert the gage into the bore at a slight angle, allow the plungers to extend, lock the knurled knob, then withdraw and measure across the plunger tips with a calibrated micrometer. Keep the gage clean and lightly oiled when stored to preserve the finish and prevent corrosion on the contact surfaces.