Spi MS160712142 Mechanical Hole Micrometer

Product Description

The SPI MS160712142 is a mechanical hole micrometer designed to measure small internal bores with high precision. It covers a measurement range of 0.1600 to 0.2000 inches with a graduation and accuracy of 0.0001 inches, making it suitable for close-tolerance work in machining, inspection, and tooling applications. The chrome finish and carbide measuring surfaces provide durability under repeated use. A ratchet stop thimble controls measuring pressure consistently, reducing operator-to-operator variation. This instrument ships with a setting ring and includes NIST-traceable calibration certification, meeting the documentation requirements of most quality management systems. Machinists, metrologists, and precision tool technicians are the primary users.

This hole micrometer is intended for measuring small internal diameters in production and inspection environments. The 0.1600 to 0.2000 inch range targets bores commonly encountered in precision machined components. With a gage depth of 0.8900 inches, it can reach into shallow to moderate bore depths. The self-centering contact points support repeatable positioning across multiple measurements without requiring manual alignment adjustment. A setting ring with a diameter of 0.1600 inches is included for zeroing the instrument before use. Suitable for use at inspection stations, machine-side quality checks, and toolroom work.

Key Features

• Measurement range of 0.1600 to 0.2000 inches with 0.0001 inch graduation
• Ratchet stop thimble for consistent, repeatable measuring pressure
• Carbide measuring surfaces resist wear under regular production use
• Self-centering contact points reduce positioning error
• NIST-traceable calibration certification included for quality compliance
• Includes a 0.1600 inch setting ring for instrument zeroing

Compatibility

Designed as an OEM-style precision measuring instrument for internal bore inspection in the 0.1600 to 0.2000 inch range, suitable for use in machining and metrology applications where NIST-traceable accuracy is required.

Installation Notes

This instrument is used by machinists and quality technicians and requires no permanent installation. Before use, zero the micrometer against the included setting ring in a temperature-stable environment to reduce thermal expansion effects on readings. Inspect carbide contact points for wear or damage before each calibration cycle. Store in the supplied case when not in use to protect the measuring surfaces and maintain calibration integrity.