Mitutoyo 368-875 Mechanical Inside Micrometer 5 to 6 in

Product Description

The MITUTOYO 368-875 is a mechanical inside micrometer designed to measure internal diameters and bores from 5 to 6 inches. It uses a three-point contact system with an extension rod style configuration, providing stable, repeatable readings without digital electronics. Graduation is 0.0002 inches with an accuracy of 0.000250 inches, making it suitable for precision bore inspection in machine shops, maintenance facilities, and manufacturing environments. The ratchet stop thimble delivers consistent measuring force to reduce operator-to-operator variation. Measuring faces are alloy steel with a satin chrome finish for corrosion resistance and long service life. Licensed machinists, tool-and-die technicians, and precision maintenance professionals are the primary users of this instrument.

The 368-875 is suited for inside diameter measurement of cylinders, housings, bores, and similar features in the 5 to 6 inch range. The extension rod design allows the instrument to reach into deeper bore configurations. The maximum extension rod length is 5.9 inches, accommodating a range of bore depths. This tool is appropriate for both production inspection and field maintenance applications where mechanical measurement is preferred over electronic instruments. No setting rings are included with this unit.

Key Features

• Measurement range of 5 to 6 inches for inside diameter applications
• Graduation of 0.0002 inches for high-resolution mechanical readings
• Accuracy rated at 0.000250 inches
• Three-point contact design for stable, centered bore measurement
• Ratchet stop thimble ensures consistent measuring force
• Alloy steel measuring faces with satin chrome finish for durability
• Includes wooden storage case

Compatibility

Designed as a precision inside micrometer for bore and internal diameter measurement applications in the 5 to 6 inch range. Suitable for use in machine shop, maintenance, and manufacturing inspection workflows requiring mechanical micrometer-based measurement.

Installation Notes

This instrument is used by machinists, maintenance technicians, and quality inspection personnel. Before measuring, clean the bore and instrument contact faces to remove debris that could affect accuracy. Allow the instrument and workpiece to reach the same ambient temperature to minimize thermal expansion error. Store in the included wooden case when not in use to protect the measuring faces.