Starrett 50981 Micrometer Calibration Standard 7 in

Product Description

The STARRETT 50981 is a spherical end micrometer calibration standard used to verify and maintain the accuracy of outside micrometers. Measuring 7 inches in length, it provides accuracy up to 0.0001 inch, making it suitable for precision measurement environments where tight tolerances are critical. The standard comes calibrated from the factory and includes a heat insulating handle, which prevents thermal expansion from hand contact during use. It is intended for use by metrologists, calibration technicians, and skilled tradespeople who rely on micrometer accuracy for quality control and inspection work.

This calibration standard is used in tool rooms, calibration labs, manufacturing facilities, and any environment where micrometer instruments must be verified against a known reference. The spherical end design allows for consistent contact geometry during the calibration check, reducing measurement error caused by improper contact point alignment. It is appropriate for professionals maintaining NIST-traceable measurement programs or in-house calibration procedures.

Key Features

• 7-inch maximum length for calibrating correspondingly sized micrometers
• Accuracy up to 0.0001 inch for precision verification
• Spherical end design ensures consistent and repeatable contact geometry
• Includes heat insulating handle to minimize thermal expansion from handling
• Ships pre-calibrated, ready for immediate use in calibration procedures

Compatibility

Designed for use with outside micrometers requiring a 7-inch calibration reference standard. Suitable for calibration checks on micrometers used across general precision measurement applications.

Installation Notes

Always use the included heat insulating handle when handling this standard to prevent thermal expansion from affecting measurement accuracy. Store the standard in its protective case when not in use to prevent surface damage to the contact points. Calibration standards should be handled by qualified calibration technicians following applicable metrology procedures and quality management requirements.