Starrett 51013 Micrometer Calibration Standard 23 in

Product Description

The STARRETT 51013 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. At 23 inches in length, this calibration bar provides a traceable reference for checking micrometer accuracy to within 0.00025 inches. The unit ships calibrated and includes a heat insulating handle to minimize thermal expansion from hand contact during use, a critical consideration when working at this level of precision. Calibration standards of this type are used by quality technicians, tool room machinists, and metrology professionals to confirm that measuring instruments are reading within acceptable tolerances.

This calibration standard is suited for use in industrial, manufacturing, and tool room environments where outside micrometers require routine verification. The 23-inch bar spans a measurement range that corresponds to large-frame outside micrometers. The included heat insulating handle allows the technician to hold the standard without introducing measurement error caused by thermal growth from body heat. Calibrated at the factory, this standard arrives ready for use in incoming inspection routines, periodic gage calibration programs, or after any micrometer repair or adjustment.

Key Features

• Calibrated accuracy to within 0.00025 inches for reliable micrometer verification
• 23-inch overall length matches the range of large outside micrometers
• Spherical ends ensure repeatable contact geometry with micrometer anvils
• Includes heat insulating handle to prevent thermal expansion errors during measurement
• Ships pre-calibrated and ready for immediate use in a calibration program

Compatibility

Designed for use with outside micrometers requiring a 23-inch calibration reference. Verify that your micrometer frame and anvil configuration accept a spherical-end calibration standard before use.

Installation Notes

This calibration standard requires no installation but should be handled by the insulating handle at all times to prevent body heat from affecting measurement accuracy. Allow the standard to thermally stabilize to the ambient room temperature before use, especially when moving it from storage to a conditioned calibration environment. Store the standard in its case when not in use to protect the spherical contact surfaces from damage. Calibration of this standard should be performed by a qualified metrology lab at intervals consistent with your facility quality program.