Starrett 50992 Micrometer Calibration Standard 300mm

Product Description

The STARRETT 50992 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. Measuring 300mm in length, this calibration standard delivers an accuracy of 0.0043 mm, making it suitable for demanding metrology and quality-control environments. The unit ships with a heat insulating handle, which allows technicians to hold the standard without transferring body heat to the gauge body and introducing thermal error into calibration readings. Weighing 0.5 pounds, the standard is compact enough for bench use or tool-crib storage.

This calibration standard is used in machine shops, manufacturing facilities, and metrology labs where outside micrometers must be periodically checked against a traceable reference. The spherical contact ends accommodate standard micrometer anvil geometry and make it straightforward to seat the standard consistently across repeated measurements. The included heat insulating handle is an important detail in any environment where precision is measured in microns, as it limits thermal expansion effects during the calibration procedure.

Key Features

• 300mm reference length for calibrating outside micrometers
• Accuracy of 0.0043 mm for high-precision verification
• Spherical ends for consistent, repeatable seating against micrometer anvils
• Includes heat insulating handle to minimize thermal measurement error
• Lightweight at 0.5 pounds for easy bench handling

Compatibility

Designed for use with outside micrometers requiring a 300mm calibration reference standard; consult your micrometer manufacturer specifications to confirm range compatibility before use.

Installation Notes

Calibration standards should be handled by a qualified metrologist or tool-room technician following the shop calibration procedure. Always hold the standard by the heat insulating handle to prevent body-heat transfer from affecting the reference length. Store the standard in its protective case when not in use and allow it to thermally stabilize to the ambient environment before taking calibration readings. Periodic recertification of the standard itself against a traceable reference is recommended to maintain measurement integrity.