Starrett 50982 Micrometer Calibration Standard 175mm

Product Description

The STARRETT 50982 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. Measuring 175mm in length, this standard features hardened spherical contact ends that provide consistent, repeatable reference points during calibration checks. It includes a heat-insulating handle that prevents thermal expansion from body heat, which could otherwise introduce measurement error. The 50982 carries an accuracy rating of 0.0032mm, making it a reliable reference tool for metrology-grade verification work performed by machinists, calibration technicians, and quality control personnel.

This calibration standard is used in tool rooms, machine shops, calibration labs, and manufacturing environments where micrometer accuracy must be periodically confirmed. The 175mm length makes it suitable for setting or checking larger-range outside micrometers. The spherical ends ensure proper contact geometry regardless of minor alignment variation during use, which is especially important in production environments where calibration is performed frequently and efficiently.

Key Features

• 175mm reference length for calibrating larger-range outside micrometers
• Spherical contact ends provide consistent, repeatable anvil contact
• Includes heat-insulating handle to eliminate thermal error from hand contact
• Accuracy of 0.0032mm for precision metrology-grade verification
• Compact single-piece construction with no setup required

Compatibility

Designed for use with outside micrometers requiring a 175mm calibration reference standard. Consult your micrometer documentation to confirm the correct reference length for your instrument range.

Installation Notes

Calibration standards should be handled by the insulating handle at all times to prevent thermal growth from affecting the reference dimension. Allow the standard to stabilize at ambient room temperature before use, particularly if it has been stored in a significantly warmer or cooler environment. Calibration work should be performed by qualified metrology or calibration personnel following applicable laboratory or shop quality procedures. Store the standard in its case when not in use to protect the contact surfaces from damage.