Mitutoyo 368-866 Inside Micrometer 0.8-1.0 in Range

Product Description

The MITUTOYO 368-866 is a mechanical inside micrometer designed for precision internal bore and hole measurement. It uses a three-point contact system to center itself automatically within a bore, delivering repeatable readings without the alignment challenges of two-point designs. The measuring range spans 0.8000 to 1.0000 inches, with a graduation of 0.0002 inches and an accuracy of 0.000150 inches. The ratchet stop thimble controls applied measuring force to prevent overloading and keeps readings consistent across multiple uses. The measuring faces are alloy steel with a satin chrome finish for durability and corrosion resistance. Machinists, tool and die makers, and quality control technicians use this instrument for production and inspection work.

The 368-866 is suited for internal measurement tasks in machine shops, manufacturing facilities, and inspection departments. It is configured for bore diameters between 0.8000 and 1.0000 inches, making it appropriate for medium small bores common in precision machined components. The extension rod capability, with a maximum extension rod length of 5.9000 inches, allows reach into deeper bores. The micrometer-based movement provides stable, fine-resolution readings. It ships in a plastic case for storage and transport protection.

Key Features

• Three-point contact system self-centers in bore for consistent, repeatable measurement
• Measuring range of 0.8000 to 1.0000 inches with 0.0002 inch graduation
• Accuracy of 0.000150 inches for precision inspection applications
• Ratchet stop thimble regulates measuring force and improves repeatability
• Alloy steel measuring faces with satin chrome finish for wear and corrosion resistance
• Extension rod support up to 5.9000 inches for deeper bore access
• Includes plastic carrying and storage case

Compatibility

Designed as an OEM-style mechanical inside micrometer for precision bore measurement in the 0.8000 to 1.0000 inch range. No specific system or model compatibility data was provided in the product input.

Installation Notes

Inside micrometers of this type are handled and used by machinists, metrologists, and quality technicians rather than installed as fixed components. Before use, verify the instrument is clean and undamaged, and allow it to reach ambient temperature to avoid thermal expansion errors. Do not apply excessive force when seating the contact points in a bore; the ratchet stop thimble is designed to limit this. Store the instrument in its included case when not in use to protect the measuring faces and thimble mechanism.