Starrett 50971 Micrometer Calibration Standard 2 in

Product Description

The STARRETT 50971 is a spherical end micrometer calibration standard used to verify and calibrate outside micrometers in the field or on the bench. It measures 2 inches in length and provides accuracy up to 0.0001 inches, making it suitable for precision measurement verification in trade and industrial settings. The standard includes a heat insulating handle that allows the technician to hold the gauge without transferring body heat to the steel, which would otherwise introduce thermal expansion error into the measurement. Metrology technicians, tool room machinists, and calibration professionals are the primary users.

This calibration standard is used wherever outside micrometers require periodic verification or in-process accuracy checks. Typical applications include tool room calibration routines, incoming inspection stations, and field verification of measurement tools on job sites. The spherical contact geometry ensures consistent point contact against the micrometer anvil and spindle, reducing operator-to-operator variation during the calibration check. It is suited for both production environments and lower-volume precision shops that maintain traceable measurement standards.

Key Features

• 2 inch reference length for outside micrometer calibration
• Accuracy up to 0.0001 inches for high-precision verification
• Spherical end design ensures consistent point contact against micrometer faces
• Includes heat insulating handle to prevent thermal expansion errors during use
• Factory calibrated at time of manufacture

Compatibility

Designed for use with outside micrometers requiring a 2 inch range calibration reference standard.

Installation Notes

This is a calibration reference standard, not an installed component. Handle only by the insulating grip to avoid thermal influence on the measurement. Store in a protective case away from temperature extremes and contaminants when not in use. Calibration intervals should follow your facility's quality management procedures or applicable metrology standards.