Starrett 50977 Micrometer Calibration Standard 5 in

Product Description

The STARRETT 50977 is a spherical end micrometer calibration standard used to verify and calibrate outside micrometers to a traceable dimensional reference. At 5 inches in length with accuracy up to 0.0001 inches, this standard delivers the precision required for tool calibration in shop, lab, and field environments. The spherical contact ends reduce the effect of angular misalignment during measurement. A heat insulating handle is included to prevent thermal expansion caused by hand contact, which is critical when working at this level of accuracy. Metrology technicians, quality control professionals, and calibration labs are the primary users of this standard.

This calibration standard is suited for use with outside micrometers in manufacturing, machining, and precision measurement environments. It is appropriate for both initial calibration setups and periodic verification checks on micrometers in active service. The 5-inch length targets a specific range of outside micrometer instruments that require a reference standard at that measurement span. The included heat insulating handle makes it practical to use in temperature-sensitive calibration routines without introducing dimensional error from body heat.

Key Features

• 5-inch length provides a precise reference dimension for micrometer calibration at that range
• Accuracy up to 0.0001 inches meets tight tolerance verification requirements
• Spherical ends reduce angular contact error during calibration checks
• Calibrated construction ensures traceable dimensional reference
• Includes heat insulating handle to prevent thermal expansion from hand contact

Compatibility

Designed for use with outside micrometers requiring a 5-inch calibration reference standard. Verify micrometer range and anvil contact type before use.

Installation Notes

Handle and store calibration standards per your facility's metrology procedures to prevent damage to the contact surfaces. Use the included heat insulating handle at all times during measurement to avoid dimensional error from thermal transfer. Inspect the spherical ends for nicks or wear before each use, as surface damage will compromise calibration accuracy. Store in a protective case away from abrasive tools and temperature extremes when not in use.