Starrett 50972 Micrometer Calibration Standard 50mm

Product Description

The STARRETT 50972 is a spherical end micrometer calibration standard used to verify and maintain the accuracy of outside micrometers. At 50mm in length, this precision reference piece delivers a calibrated datum point against which micrometer measurements can be confirmed and corrected. The 50972 is calibrated to an accuracy of 0.0025 mm, making it appropriate for precision measurement environments where close tolerances matter. A heat insulating handle is included to prevent thermal expansion errors caused by hand contact during use, which is critical when working at this level of measurement resolution. Calibration standards of this type are used by metrology technicians, quality control personnel, and precision machinists.

This calibration standard is suited for use in machine shops, quality labs, and manufacturing facilities where outside micrometers require periodic verification. The spherical end design ensures repeatable contact geometry during the calibration check, reducing measurement variability. It is appropriate for both bench-top calibration routines and in-field verification tasks where a traceable reference standard is needed alongside standard micrometer use.

Key Features

• 50mm calibration length for verifying micrometer accuracy at a specific reference point
• Calibrated to 0.0025 mm accuracy for high-precision measurement verification
• Spherical end geometry provides consistent, repeatable contact during measurement checks
• Includes heat insulating handle to eliminate thermal growth errors from hand contact
• Factory calibrated — ready for use as a reference standard out of the box

Compatibility

Designed for use with outside micrometers requiring a spherical end reference standard for calibration and verification purposes.

Installation Notes

Calibration standards should be handled using the included heat insulating handle at all times to prevent thermal expansion from affecting measurement accuracy. Store the standard in a controlled-temperature environment away from direct sunlight and heat sources. Periodic re-certification by a qualified metrology lab is recommended to maintain traceable accuracy over time. This item does not require mechanical installation and should not be modified or machined.