Starrett 50997 Micrometer Calibration Standard 15 in

Product Description

The STARRETT 50997 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers. At 15 inches in length and accurate to 0.0002 inches, this reference standard provides a reliable measurement baseline for metrology checks in tool rooms, calibration labs, and production environments. The part includes a heat insulating handle, which prevents thermal expansion errors caused by hand contact during use. Calibration standards of this type are used by quality technicians, metrologists, and precision machinists who need traceable, repeatable measurement verification.

This calibration standard is intended for use with outside micrometers requiring a 15-inch reference length. It is well suited for tool cribs, inspection departments, and job shops that maintain a calibrated instrument program. The heat insulating handle is a practical feature in any environment where temperature stability affects measurement accuracy. This part ships as a single unit and is appropriate for facilities that service or verify large-frame micrometers.

Key Features

• 15-inch reference length for large-range micrometer verification
• Accuracy up to 0.0002 inches for precise calibration checks
• Calibrated from factory — ready for immediate use as a reference standard
• Spherical ends designed for consistent contact point engagement with micrometer anvils
• Includes heat insulating handle to minimize thermal expansion from hand contact

Compatibility

Designed for use with outside micrometers that require a 15-inch calibration reference standard. Intended as a verification tool for instruments within that measurement range.

Installation Notes

Calibration standards are handled by quality technicians or metrologists following established metrology procedures. Always hold the standard by the heat insulating handle to prevent body heat from affecting the reference length. Store the standard in its case when not in use to prevent damage to the contact surfaces. Periodic recertification against a traceable reference is recommended per your facility calibration program.