Starrett 50986 Micrometer Calibration Standard 225mm

Product Description

The STARRETT 50986 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers. At 225mm in length, this reference bar provides a known, traceable measurement that technicians use to confirm micrometer calibration before taking critical measurements. The 50986 includes a heat insulating handle that prevents thermal expansion from body heat, protecting measurement integrity during use. Accuracy is rated at 0.0038mm, making it suitable for precision metrology applications in tool rooms, calibration labs, and manufacturing environments.

This calibration standard is used wherever precise outside micrometer verification is required. Typical applications include incoming inspection stations, calibration labs, machine shops, and quality control environments. The heat insulating handle makes it practical for bench use during routine calibration checks. Metrologists, calibration technicians, and precision machinists are the primary users of this type of reference standard.

Key Features

• Spherical ends provide consistent, repeatable contact points for micrometer calibration
• Accuracy rated at 0.0038mm for precision verification work
• 225mm length suits a range of outside micrometer calibration checks
• Includes heat insulating handle to minimize thermal growth from hand contact
• Single-piece reference bar construction for straightforward use and storage

Compatibility

Designed for use with outside micrometers requiring a reference standard in the 225mm measurement range. Specific compatible micrometer models were not provided in the available data.

Installation Notes

Calibration standards should be handled only by the insulating handle to prevent thermal error from body heat. Allow the standard to thermally stabilize in the measurement environment before use, per standard metrology practice. Clean contact surfaces with a lint-free cloth before each use and inspect for nicks or burrs that could affect accuracy. Store in the provided case or a protected location away from impacts and temperature extremes.