Starrett 51005 Micrometer Calibration Standard 19 in

Product Description

The STARRETT 51005 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. Measuring 19 inches in length, it delivers calibration accuracy to 0.00025 inches, making it suitable for high-tolerance inspection and quality control work. The unit includes a heat insulating handle that prevents thermal expansion from body heat from affecting the reference measurement during use. Calibration standards of this type are used by metrology technicians, toolroom machinists, and quality assurance personnel who require traceable dimensional references.

This calibration standard is used in toolrooms, inspection labs, and manufacturing environments where micrometer accuracy must be confirmed before or during precision work. The 19-inch working length accommodates calibration checks across a range of larger-capacity outside micrometers. It is factory calibrated and ready for use as a reference standard for routine gauge verification routines.

Key Features

• Calibration accuracy to 0.00025 inches for high-tolerance verification work
• 19-inch overall length supports larger-capacity outside micrometer ranges
• Spherical contact ends ensure consistent, repeatable point contact during calibration
• Includes heat insulating handle to minimize thermal growth during handling
• Factory calibrated and ready for immediate use as a dimensional reference

Compatibility

Designed for use with outside micrometers requiring a long-range calibration reference standard. No specific compatible model numbers were provided in the product data.

Installation Notes

Calibration standards are handled and stored by metrology or toolroom personnel — they are not installed components. Always handle the standard by the heat insulating handle, not the measuring surfaces, to prevent thermal error. Store in the provided case or a clean, temperature-stable environment away from coolants, oils, and abrasive contaminants. Verify ambient temperature stabilization before taking reference measurements, as recommended by applicable dimensional metrology procedures.