Starrett 50969 Micrometer Calibration Standard 1 Inch

Product Description

The STARRETT 50969 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement. With a calibrated length of 1 inch and an accuracy of 0.000050 inch, this standard provides a reliable reference point for zero-setting and span verification in shop, lab, and field environments. A heat insulating handle is included to prevent thermal expansion from affecting the reference dimension during use. Calibration standards like this one are essential tools for metrology technicians, quality control personnel, and any trade professional who depends on micrometer accuracy for critical measurements.

This calibration standard is suited for use with outside micrometers requiring a 1-inch reference. It is commonly used in manufacturing, machining, HVAC equipment service, and mechanical trades where micrometer calibration is part of a tool maintenance or quality assurance program. The spherical end geometry ensures consistent, repeatable contact with the micrometer anvil and spindle, reducing operator-induced measurement error during the calibration process.

Key Features

• Calibrated reference length of 1 inch for micrometer zero-setting and verification
• Accuracy of 0.000050 inch for high-precision calibration applications
• Spherical end geometry provides consistent, repeatable anvil contact
• Includes heat insulating handle to minimize thermal expansion error during use
• Factory calibrated for immediate use out of packaging

Compatibility

Designed for use with outside micrometers requiring a 1-inch calibration reference. Suitable for standard micrometer frames with flat or spherical anvil and spindle contact surfaces.

Installation Notes

Handle the calibration standard only by the heat insulating handle to avoid transferring body heat to the gauge body, which can cause thermal expansion and affect accuracy. Allow the standard and micrometer to reach the same ambient temperature before use, particularly when moving between environments with different temperatures. Store the standard in its case when not in use to protect the reference surfaces from damage or contamination.