Starrett 51015 Micrometer Calibration Standard 24 in

Product Description

The STARRETT 51015 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. Measuring 24 inches in maximum length with a calibrated accuracy of 0.00025 inches, this standard provides a reliable reference for metrology work in machine shops, tool rooms, and quality control environments. The unit includes a heat insulating handle to prevent thermal expansion from body heat from affecting readings during use, protecting the integrity of calibration results. It is intended for use by machinists, metrologists, and quality assurance technicians who require traceable dimensional references.

This calibration standard is suited for shop floor and laboratory environments where micrometer accuracy must be routinely verified. It supports calibration workflows for outside micrometers across a wide measurement range up to 24 inches. The spherical contact ends ensure consistent point contact with micrometer anvils, reducing measurement error caused by surface alignment variables. Typical users include tool room technicians and QC inspectors working to ISO, ANSI, or in-house calibration procedures requiring documented, traceable standards.

Key Features

• 24-inch maximum length for verifying large-range outside micrometers
• Calibrated accuracy of 0.00025 inches for precision reference work
• Spherical ends provide consistent point contact with micrometer anvils
• Includes heat insulating handle to minimize thermal expansion during handling
• Factory calibrated — ready for immediate use in calibration procedures

Compatibility

Designed for use with outside micrometers requiring a calibration standard up to 24 inches. Suitable as a reference standard in shop floor and laboratory micrometer calibration programs.

Installation Notes

This is a calibration reference standard, not an installed component. Handle only by the heat insulating handle to prevent body heat from causing thermal expansion that would affect accuracy. Store in a controlled-temperature environment away from direct sunlight and vibration when not in use. Calibration intervals and traceability documentation should follow applicable quality system requirements such as ISO 9001 or ISO/IEC 17025.