Spi 10-711-0 Mechanical Hole Micrometer 0.275-0.350 in

Product Description

The SPI 10-711-0 is a mechanical hole micrometer designed to measure internal bore diameters with high precision. It covers a measuring range of 0.2750 to 0.3500 inches, with a graduation of 0.0001 inches and an accuracy of 0.000200 inches. The instrument features a ratchet stop thimble for consistent measuring pressure and solid carbide contact anvils for long-term durability. The three-point contact design provides self-aligning and self-centering operation, reducing operator error during bore measurement. Licensed HVAC technicians, machinists, and precision measurement professionals use this tool for quality control and dimensional inspection tasks.

The 10-711-0 is suited for measuring small internal bores in precision components, valve bodies, machined housings, and similar applications where tight tolerances must be verified. The gage depth reaches 2.0000 inches, and the maximum extension rod length is 4.0000 inches, allowing reach into recessed bore features. A 0.3500-inch setting ring diameter is specified for calibration reference. This tool is used in shop floor metrology, maintenance environments, and quality inspection stations where bore tolerances are critical.

Key Features

• Measuring range: 0.2750 to 0.3500 inches
• Graduation of 0.0001 inches with 0.000200-inch accuracy
• Solid carbide measuring anvils for wear resistance
• Three-point contact with self-aligning and self-centering design
• Ratchet stop thimble for repeatable measuring force
• Gage depth of 2.0000 inches; maximum extension rod length of 4.0000 inches

Compatibility

Designed as a precision bore measuring instrument suitable for use in machining, quality control, and dimensional inspection applications requiring internal diameter measurement in the 0.2750 to 0.3500-inch range.

Installation Notes

Hole micrometers are calibrated instruments and should be handled by trained metrology or mechanical inspection personnel. Before use, verify calibration against the setting ring specified for this tool. Store in the protective case when not in use to protect the carbide anvils from impact and contamination. Do not apply excessive force to the spindle; use only the ratchet stop mechanism to achieve consistent measuring pressure.