Fowler 52-240-004-1 Mechanical Outside Micrometer 4 in

Product Description

The FOWLER 52-240-004-1 is a mechanical outside micrometer designed for precision measurement in machine shops, fabrication, and metrology applications. It covers a measurement range up to 4 inches with a graduation of 0.0001 inches and an accuracy of 0.0002 inches, making it suitable for close-tolerance inspection work. The micrometer features a ratchet stop thimble for consistent measuring pressure and solid carbide measuring faces for long-term wear resistance. A quick, easy zero adjustment on the sleeve simplifies calibration during daily use. Machinists, tool and die workers, and quality control technicians are the primary users of this instrument.

The 52-240-004-1 is suited for dimensional inspection of shafts, pins, turned parts, and other round or flat workpieces requiring precise outside measurement. It is appropriate for both job shop and production environments where manual, non-digital measurement is preferred or required. The ratchet stop thimble ensures repeatable spindle pressure across multiple measurements and operators. The included case and wrench support field portability and on-machine use. It is well matched to general mechanical, automotive, aerospace, and manufacturing trades.

Key Features

• 4-inch maximum measurement range with 0.0001-inch graduation for fine-resolution readings
• Accuracy rated at 0.0002 inches for close-tolerance inspection
• Ratchet stop thimble delivers consistent and repeatable spindle measuring pressure
• Solid carbide measuring faces resist wear for extended service life
• Quick, easy zero adjustment on the sleeve for fast field calibration
• Includes protective case and sleeve wrench

Compatibility

Designed as a standard mechanical outside micrometer for general-purpose dimensional measurement of outside diameters and thicknesses up to 4 inches.

Installation Notes

This instrument requires no power source and no installation in the electrical or mechanical systems sense. Store in the included case to protect the measuring faces and spindle. Before use, verify zero calibration using the included wrench and standard reference gauge. Clean measuring faces before and after use to maintain accuracy; do not use the instrument to measure surfaces with abrasive contaminants or burrs that could damage the carbide faces.