Starrett 50980 Micrometer Calibration Standard 150mm

Product Description

The STARRETT 50980 is a spherical end micrometer calibration standard designed for verifying and calibrating micrometer instruments in shop, lab, and field service environments. At 150mm in maximum length, it provides a precise reference dimension with an accuracy of 0.0025 mm. The included heat insulating handle prevents thermal expansion from hand contact, protecting measurement integrity during use. Metrology technicians, quality control inspectors, and precision tradespeople rely on this type of standard to maintain calibrated tool records required by ISO, ANSI, and similar quality systems.

This calibration standard is used wherever outside micrometers require periodic verification or adjustment checks. Typical applications include incoming inspection stations, tool crib calibration programs, and on-site field verification in manufacturing, machining, and precision fabrication environments. The spherical end design ensures repeatable point contact with micrometer anvils, reducing operator error during the calibration check process. It is appropriate for both residential shop use and commercial production floor quality programs.

Key Features

• 150mm maximum length provides a precise reference dimension for micrometer calibration
• Accuracy of 0.0025 mm for reliable, traceable measurement verification
• Spherical end design ensures consistent anvil contact and repeatable readings
• Includes heat insulating handle to prevent thermal growth from hand contact
• Factory calibrated — ready for use as a calibration reference upon receipt

Compatibility

Designed as a calibration reference standard for use with outside micrometers requiring verification within the 150mm range. Specific model compatibility was not provided in available product data.

Installation Notes

Calibration standards should be handled only by the insulating handle to avoid introducing thermal error from body heat. Allow the standard to reach ambient temperature before use, particularly when moving between environments. Store in its protective case when not in use to prevent surface damage. Calibration procedures should follow applicable metrology standards and organizational quality system requirements.