Spi MS160712004 Micrometer Calibration Standard 4 in

Product Description

The SPI MS160712004 is a flat-end micrometer calibration standard used to verify and set the accuracy of outside micrometers. The standard measures 4 inches in length and is calibrated to an accuracy of 0.0001 inch, making it suitable for precision measurement verification in machine shops, metrology labs, and maintenance environments. A heat-insulating handle is included to prevent thermal expansion errors caused by hand contact during use. This type of reference standard is handled by machinists, tool room technicians, and quality control inspectors.

This calibration standard is designed for use with outside micrometers requiring a 4-inch reference length. It is well suited to production and inspection settings where consistent micrometer verification is required before or during measurement tasks. The flat-end geometry matches standard micrometer anvil and spindle face profiles. The included heat-insulating handle is a practical feature for repeated daily use where thermal stability affects reading accuracy.

Key Features

• Calibrated flat-end standard with accuracy up to 0.0001 inch
• 4-inch reference length for outside micrometer verification
• Flat end shape matches standard micrometer anvil and spindle geometry
• Includes heat-insulating handle to minimize thermal expansion during handling
• Factory calibrated — ready for immediate use as a reference standard

Compatibility

Designed for use with outside micrometers requiring a 4-inch calibration reference. Suitable for standard micrometer designs with flat anvil and spindle faces used in machine shop and inspection applications.

Installation Notes

This standard is handled by machinists and quality control technicians during micrometer setup and verification. Always use the included heat-insulating handle when holding the standard to avoid dimensional changes from body heat. Store the standard in its case when not in use to protect the reference surfaces from damage or contamination. No tools or fasteners are required for normal calibration use.