Starrett 50975 Micrometer Calibration Standard 4 in

Product Description

The STARRETT 50975 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of micrometer measurements in precision metrology applications. Measuring 4 inches in length and calibrated to an accuracy of 0.0001 inches, this standard provides a reliable reference point for checking micrometer anvil contact and overall instrument calibration. It includes a heat insulating handle to prevent thermal expansion caused by hand contact, which is critical when working at this level of precision. Machinists, quality control technicians, and calibration lab personnel use this standard as part of routine instrument verification routines.

This calibration standard is suited for tool rooms, metrology labs, and quality assurance environments where micrometer accuracy must be confirmed before or after use. The spherical end design ensures consistent, repeatable contact geometry during calibration checks. It is appropriate for use in both production floor settings and dedicated calibration environments where traceable measurement accuracy is required. The included heat insulating handle makes it practical for bench use without requiring gloves or a fixture to avoid thermal influence on the measurement surface.

Key Features

• Calibrated to 0.0001 inch accuracy for high-precision micrometer verification
• 4-inch length provides a fixed reference standard for outside micrometer calibration
• Spherical end geometry ensures consistent, repeatable contact during checks
• Includes heat insulating handle to minimize thermal expansion from handling
• Factory calibrated, ready for use upon receipt

Compatibility

Designed for use with outside micrometers requiring a 4-inch calibration reference. Suitable for standard outside micrometers with spherical or flat anvil contact surfaces used in precision measurement applications.

Installation Notes

This calibration standard does not require installation but should be handled using the supplied heat insulating handle at all times to avoid dimensional variation from body heat. Store the standard in its protective case when not in use to prevent surface damage to the reference faces. Calibration standards should be verified periodically against traceable reference standards in accordance with your facility quality management procedures. Metrology technicians or qualified tool room personnel should perform micrometer calibration checks using this standard.