Starrett 50987 Micrometer Calibration Standard 10 in

Product Description

The STARRETT 50987 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers. At 10 inches in length with a calibrated accuracy of 0.00015 inches, this gauge bar serves as a precision reference for calibration routines in metrology labs, machine shops, and quality control environments. The included heat insulating handle prevents thermal expansion from body heat, which is critical when working at sub-tenth accuracy levels. Calibrated out of the box, it is ready for immediate use in precision measurement workflows managed by metrology technicians, tool room machinists, and quality assurance professionals.

This calibration standard is suited for shops and facilities that perform periodic micrometer calibration as part of a tool management or ISO compliance program. It is used to check the accuracy of outside micrometers across a 10-inch measurement range. The spherical contact ends provide a consistent, repeatable contact point regardless of minor angular misalignment during use, making it well-suited for bench calibration setups. Typical users include tool crib technicians, quality inspectors, and precision machinists who calibrate micrometers on a scheduled or as-needed basis.

Key Features

• Calibrated accuracy of 0.00015 inches for reliable micrometer verification
• 10-inch length covers full-range calibration for large outside micrometers
• Spherical ends provide consistent, repeatable contact geometry
• Includes heat insulating handle to minimize thermal growth during handling
• Calibrated at the factory and ready for immediate use

Compatibility

Designed for use with outside micrometers requiring a 10-inch calibration reference standard. Intended for bench calibration use in tool rooms, metrology labs, and quality control departments.

Installation Notes

Always hold this standard by the heat insulating handle to prevent body heat from affecting the gauge length. Store in a temperature-stable environment away from direct sunlight and heat sources when not in use. Calibration standards should be cleaned with a lint-free cloth before and after each use to avoid contamination of contact surfaces. Periodic recertification by an accredited metrology lab is recommended to maintain traceability to national standards.