Spi MS160712025 Internal Micrometer Extension

Product Description

The SPI MS160712025 is a steel extension rod designed for use with SPI Hole-Mike Series internal micrometers. It extends the reach of the micrometer to measure bores and internal diameters that fall outside the base instrument range. The extension has an overall length of 4 inches and supports a minimum measurement of 0.275 inches, with a maximum measurement capacity of 0.500 inches. The satin chrome finish resists corrosion and reduces glare during use. Machinists, metrologists, and precision measurement technicians install this accessory to expand the utility of an existing Hole-Mike setup without purchasing an additional micrometer set.

This extension is suited for shop floor and lab environments where internal diameter measurement of small bores is required. It is a single-piece accessory that mounts directly to compatible SPI Hole-Mike Series micrometers. Typical applications include measuring precision bores in machined components, tooling fixtures, and hydraulic or pneumatic cylinder bodies where depth or bore geometry requires an extended-reach measurement tool.

Key Features

• Steel construction with satin chrome finish for durability and corrosion resistance
• 4-inch overall length extends micrometer reach into deep or recessed bores
• Minimum measurement of 0.275 inches and maximum of 0.500 inches
• Single-piece design for straightforward attachment and removal
• Compatible with SPI Hole-Mike Series micrometers

Compatibility

Designed for use with SPI Hole-Mike Series Micrometers. Verify thread and shank specifications against your specific Hole-Mike instrument before ordering.

Installation Notes

Installation is performed by qualified metrology or machine shop personnel familiar with internal micrometer accessories. Thread the extension onto the micrometer spindle per the instrument manufacturer guidelines, ensuring no cross-threading occurs. Calibrate the micrometer assembly after attaching the extension before taking measurements. Handle with care to avoid bending or surface damage that could affect measurement accuracy.