Mitutoyo 368-876 Inside Micrometer 6 to 7 Inches

Product Description

The MITUTOYO 368-876 is a mechanical inside micrometer designed to measure internal diameters and bores with high precision. It covers a measurement range of 6 to 7 inches and delivers a graduation of 0.0002 inches with an accuracy of 0.000250 inches. The ratchet stop thimble provides consistent measuring force, reducing operator-to-operator variation on the shop floor or in the field. The tool uses a three-contact-point design with extension rod capability, giving it stable, repeatable contact across the bore surface. Measuring faces are alloy steel with a satin chrome finish for durability and corrosion resistance. This tool is used by machinists, pipefitters, and precision tradespeople who require verified internal measurements on large-bore components.

The 368-876 is suited for inspecting large-bore cylinders, pipe internals, valve bodies, housings, and similar components in mechanical, industrial, and trade service environments. The extension rod system allows the tool to reach up to 5.9 inches in extension rod length, expanding its reach inside deep bores. The micrometer-based movement provides smooth, controlled adjustment across the full range. It is packaged in a wooden case for protection and organized storage between uses.

Key Features

• Measurement range: 6 to 7 inches for large internal diameter work
• Graduation of 0.0002 inches for fine resolution reads
• Accuracy rated at 0.000250 inches
• Ratchet stop thimble for consistent, repeatable measuring force
• Three-point contact design for stable bore engagement
• Alloy steel measuring faces with satin chrome finish
• Maximum extension rod length of 5.9 inches

Compatibility

Designed as an OEM-style mechanical inside micrometer for large-bore internal measurement applications requiring a 6 to 7 inch range with extension rod capability.

Installation Notes

Inside micrometers are precision instruments and should be handled and stored with care to prevent damage to the measuring faces or spindle. Before use, verify calibration against a known standard and ensure the bore surface is clean and free of debris. No power tools are required for operation. Follow applicable shop metrology procedures and manufacturer calibration guidelines when using this instrument for inspection or quality-control work.