Spi 10-703-7 Hole Micrometer 0.2250-0.2750 Inch Range

Product Description

The SPI 10-703-7 is a mechanical inside micrometer designed to measure small-diameter bores and holes with high repeatability. It covers a measurement range of 0.2250 to 0.2750 inches, with a graduation of 0.0001 inches and an accuracy of 0.0002 inches. Three-point solid carbide contact anvils are self-aligning and self-centering, which reduces operator error and produces consistent readings across multiple measurements. A ratchet stop thimble controls measuring force, preventing over-tightening and protecting the workpiece surface. This instrument is suited for quality control, precision machining, and inspection work performed by machinists, toolmakers, and metrology technicians.

The 10-703-7 is used in precision manufacturing and inspection environments where small-bore dimensional verification is required. Typical applications include checking drilled, reamed, or bored holes in metal components during production or incoming inspection. The 0.7800-inch gage depth and 0.2750-inch setting ring diameter define the reach and calibration reference for this tool. It is appropriate for both shop-floor and lab use where tolerances are tight and manual measurement is specified.

Key Features

• Measurement range: 0.2250 to 0.2750 inches for small-bore applications
• Graduation of 0.0001 inches supports high-resolution dimensional checks
• Accuracy of 0.0002 inches for reliable, repeatable results
• Solid carbide measuring anvils resist wear on hardened and abrasive workpieces
• Self-aligning and self-centering three-point contact for consistent bore registration
• Ratchet stop thimble controls applied force and prevents measurement error from over-tightening

Compatibility

Designed as a standalone mechanical hole micrometer for precision bore measurement in the 0.2250 to 0.2750 inch range. No extension rods or setting rings are included with this unit.

Installation Notes

This instrument requires no installation and is used as a handheld measuring device. Before use, verify the tool is zeroed or calibrated against a known reference standard appropriate to the measurement range. Keep the measuring anvils clean and free of debris to maintain accuracy. Store in a protective case away from temperature extremes and direct contact with other tools to prevent damage to the carbide anvil surfaces.