Starrett 51011 Micrometer Calibration Standard 22 in

Product Description

The STARRETT 51011 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. At 22 inches in length with a certified accuracy of 0.00025 inches, this standard provides a reliable reference for technicians and machinists who require traceable calibration checks. The unit ships factory-calibrated and includes a heat insulating handle, which prevents thermal expansion from hand contact during measurement — a critical factor when working at this level of precision. Calibration standards of this type are used by quality control personnel, tool room technicians, and metrology labs.

This calibration standard is suited for use in industrial production environments, tool rooms, and quality assurance labs where outside micrometers require periodic verification. The 22-inch length accommodates larger-range micrometers used in heavy manufacturing, aerospace component inspection, and precision machining operations. The included heat insulating handle is especially useful during extended calibration sessions where repeated handling would otherwise introduce thermal error.

Key Features

• Factory-calibrated with a certified accuracy of 0.00025 inches
• 22-inch overall length for use with large-range outside micrometers
• Spherical ends provide consistent contact geometry for repeatable readings
• Includes heat insulating handle to minimize thermal error from hand contact
• Ready to use out of the box — no additional calibration setup required

Compatibility

Designed for use with outside micrometers requiring a 22-inch reference standard for calibration and verification checks.

Installation Notes

Calibration standards should be handled and stored according to the micrometer manufacturer's recommendations and applicable metrology lab procedures. Allow the standard to stabilize to ambient temperature before use to minimize thermal expansion error — the included heat insulating handle supports this practice during active measurement. Store in a protective case away from humidity, abrasives, and temperature extremes when not in use. Calibration intervals should follow the shop's quality management system or applicable ISO or ANSI standards for measuring equipment.