Fowler 52-255-317-0 Mechanical Micrometer 1.375 to 2 Inch

Product Description

The FOWLER 52-255-317-0 is a mechanical outside micrometer designed for precision dimensional measurement in the 1.375 to 2 inch range. It features a ratchet stop thimble for consistent measuring force and solid carbide measuring faces for long-term wear resistance. Graduation is 0.00025 inches with an accuracy rating of 0.000150 inches, making it suitable for close-tolerance inspection work. A UKAS traceability certification is included. This tool is used by machinists, quality control inspectors, and metrology technicians in manufacturing, fabrication, and tool-and-die environments.

The 52-255-317-0 is intended for bench or floor-level inspection tasks where precise bore or outside diameter verification is required in the mid-range measurement window. The included setting ring at 1.375 inches allows for quick zero verification before use. A gage depth of 3.15 inches provides adequate reach for most standard workpiece geometries. One setting ring is included in the package. This micrometer is well-suited for job shops, quality labs, and production lines where repeatable hand-tool measurement is part of standard workflow.

Key Features

• Measurement range: 1.375 to 2 inches
• Graduation of 0.00025 inches for fine resolution readings
• Accuracy of 0.000150 inches
• Ratchet stop thimble ensures consistent applied measuring force
• Solid carbide measuring faces for extended service life
• UKAS traceability certification included for quality-system compliance
• One 1.375 inch setting ring included for zero-point verification

Compatibility

Designed as a standalone mechanical micrometer for outside diameter measurement applications in the 1.375 to 2 inch range. No specific system compatibility is stated by the manufacturer for this part number.

Installation Notes

This instrument is handled and calibrated by metrology technicians or quality control personnel, not installed in a mechanical system. Before use, verify the zero setting using the included 1.375 inch setting ring and a calibrated standard. Store the micrometer in its case when not in use to protect the carbide measuring faces and maintain calibration integrity. Do not apply excessive clamping force beyond what the ratchet stop mechanism permits, as over-tightening can affect accuracy.