Mitutoyo 368-864 Mechanical Inside Micrometer

Product Description

The MITUTOYO 368-864 is a mechanical inside micrometer designed for precision internal bore measurement. It uses a three-contact-point configuration with a micrometer-based movement for stable, repeatable readings. The ratchet stop thimble controls measuring force consistently, which reduces operator error during use. Graduated at 0.0002 inches with an accuracy of 0.0001 inches, this instrument is suited for exacting measurement tasks in machine shops, manufacturing facilities, and maintenance environments. The measuring faces are alloy steel with a satin chrome finish that resists corrosion and reduces glare during inspection work.

The 368-864 is intended for professional metrology and precision measurement applications. It is well matched to tasks requiring accurate internal bore gauging where access or geometry limits the use of a standard two-point micrometer. The extension rod capability allows the instrument to reach into deeper bores, with a maximum extension rod length of 5.9 inches. Machinists, quality control technicians, and tool-and-die professionals are the typical end users of this instrument.

Key Features

• Three-point contact design provides stable, self-centering measurement inside bores
• Ratchet stop thimble ensures consistent measuring force across readings
• Micrometer-based movement delivers 0.0002 inch graduation and 0.0001 inch accuracy
• Alloy steel measuring faces with satin chrome finish for durability and corrosion resistance
• Extension rod type with maximum rod length of 5.9 inches for deep bore access
• Includes protective plastic storage case

Compatibility

Designed as a precision inside micrometer for general industrial and metrology applications where internal bore measurement to 0.65 inch range is required.

Installation Notes

This instrument requires no installation but should be handled and stored according to standard metrology practices. Zero and calibrate the micrometer against a known reference before use. Keep the measuring faces clean and free of debris to preserve accuracy. Store in the included plastic case when not in use to protect the instrument from damage and contamination.