Fowler 52-240-003-1 Outside Micrometer 3 Inch

Product Description

The FOWLER 52-240-003-1 is a mechanical outside micrometer designed for high-precision linear measurement in machining, fabrication, and inspection environments. It covers a measurement range of 3 inches with a graduation of 0.0001 inches and an accuracy of 0.00023 inches, making it suitable for close-tolerance work where consistent repeatability is critical. The ratchet stop thimble controls applied measuring pressure, reducing operator-to-operator variation. Solid carbide measuring faces provide long-term wear resistance. A quick-zero adjustment on the sleeve allows fast calibration without specialized tooling. This instrument is used by machinists, quality control technicians, and precision tradespeople who require reliable hand-tool measurement.

The 52-240-003-1 is appropriate for general-purpose outside diameter and thickness measurement across metalworking, mechanical assembly, and inspection applications. It suits both shop-floor use and bench inspection tasks. The fixed non-rotating spindle design keeps the measuring faces properly oriented throughout the stroke. The included case and sleeve wrench support proper storage and field calibration. This micrometer fits workflows where a digital readout is not required and a durable mechanical instrument is preferred.

Key Features

• 3-inch measurement range with 0.0001-inch graduation for precise readings
• Accuracy of 0.00023 inches supports close-tolerance inspection work
• Ratchet stop thimble standardizes measuring force across operators
• Solid carbide measuring faces resist wear for extended service life
• Quick, easy zero adjustment on sleeve for fast field calibration
• Non-rotating spindle maintains consistent face alignment during measurement
• Includes protective case and sleeve wrench

Compatibility

Designed as a general-purpose outside micrometer suitable for standard metalworking, fabrication, and precision inspection applications requiring a 3-inch range mechanical instrument.

Installation Notes

This instrument is used by machinists, metrologists, and precision tradespeople and requires no power source or installation. Before use, verify zero calibration with the included sleeve wrench and store the micrometer in its case when not in service to protect the measuring faces. Avoid dropping or impacting the instrument, as this can affect calibration and spindle alignment. Periodic cleaning of the spindle threads and measuring faces with a lint-free cloth is recommended to maintain accuracy.