Spi CMS160712052 Electronic Bore Gage 3.5 to 4 in

Product Description

The SPI CMS160712052 is a 3-point electronic bore gage designed for precision internal diameter measurement in machine shop and industrial metrology applications. It covers a measuring range of 3.5 to 4 inches with a resolution of 0.0001 inches and accuracy up to 0.0002 inches. The gage features a pistol-grip handle for single-handed operation and supports both right- and left-hand viewing, making it practical for technicians measuring in tight or awkward bore orientations. The 3-point contact heads are constructed from solid carbide for long-term durability under repeated use. The unit ships with an indicator, CR2032 battery, and accessories, all housed in a fitted carrying case.

This bore gage is suited for precision measurement tasks in manufacturing, engine rebuilding, quality control, and maintenance environments where consistent internal diameter readings are required. The pistol-grip form factor and single-handed operation make it practical for production-floor use as well as bench-top inspection. The 4.48-inch gage depth allows measurement access in deeper bores within the 3.5 to 4 inch range. Machinists, metrologists, and toolroom technicians are the primary users of this instrument.

Key Features

• 3-point solid carbide contact heads for durability and consistent seating in the bore
• Measuring range of 3.5 to 4 inches with 0.0001 inch resolution
• Pistol-grip handle enables single-handed operation
• Supports right-hand and left-hand viewing for flexible positioning
• Automatic shut-off to preserve battery life
• Furnished in a fitted case with indicator and battery included
• 2-year manufacturer warranty

Compatibility

Designed for use as a standalone precision bore measurement instrument for internal diameters from 3.5 to 4 inches. The included indicator integrates directly with the gage body; no additional indicator purchase is required.

Installation Notes

This instrument requires no installation in a fixed system but should be handled and stored in its fitted case to protect the carbide contact heads and indicator. Calibrate against a known ring gage or master setting ring before use, following the manufacturer calibration procedure. Avoid dropping or subjecting the gage to impact, as this can shift calibration or damage the 3-point head assembly. Battery replacement uses a CR2032 cell; the automatic shut-off feature extends battery service life between replacements.