Spi 10-722-7 Mechanical Hole Micrometer 0.8 Inch Range

Product Description

The SPI 10-722-7 is a mechanical inside hole micrometer designed for precision bore measurement in demanding shop and field environments. It uses a three-contact-point measuring system with solid carbide anvils to deliver accurate readings across a range up to 0.8 inches. Graduation is 0.0002 inches and accuracy is rated at 0.0002 inches. The ratchet stop thimble provides consistent measuring pressure, reducing operator-to-operator variation. The self-aligning and self-centering contact geometry helps seat the tool correctly in the bore without manual adjustment. This instrument is well suited for machinists, toolmakers, and quality-control technicians who require reliable hole measurement without digital electronics.

The SPI 10-722-7 is used in machine shops, manufacturing facilities, and maintenance environments where bore diameter verification is part of standard workflow. Typical applications include checking cylinder bores, bushing fits, bearing seats, and other precision holes in both production and inspection settings. The mechanical readout makes it suitable for environments where battery-dependent digital tools are impractical. Maximum gage depth reaches 2.36 inches, and the maximum extension rod length is 6 inches, supporting measurement at depth when needed.

Key Features

• Solid carbide measuring anvils for wear resistance and long service life
• Self-aligning and self-centering three-point contact system for repeatable seating
• Ratchet stop thimble delivers consistent, controlled measuring pressure
• 0.0002 inch graduation and 0.0002 inch accuracy for precise bore measurement
• Gage depth of 2.36 inches supports measurements below surface level
• Maximum extension rod length of 6 inches for deep bore reach

Compatibility

Designed for use as a mechanical inside hole micrometer suitable for bore measurement applications requiring a range up to 0.8 inches and a setting ring diameter of 0.65 inches.

Installation Notes

This instrument is a precision measuring tool, not a mechanical assembly component. Before use, verify calibration against a known standard and handle with clean, dry hands to prevent thermal expansion error. Store in the provided case away from moisture, chips, and direct heat sources. Calibration and care should follow the manufacturer guidelines and applicable shop quality procedures.