Starrett 55959 Outside Micrometer 1 in Ratchet Stop

Product Description

The STARRETT 55959 is a mechanical outside micrometer built for precise dimensional measurement of external workpiece features. It covers a measurement range of 0 to 1 inch with a graduation of 0.0001 inches and an accuracy of 0.000050 inches, making it a reliable tool for applications where close tolerances are critical. The thimble uses a ratchet stop mechanism to deliver consistent measuring pressure on every reading. A digital counter is integrated into the frame for fast readout, and a ring-style lock nut secures the spindle position once a measurement is taken. Measuring faces are solid carbide for durability and wear resistance.

This micrometer is suited for use in machine shops, tool rooms, and manufacturing environments where accurate outside diameter or thickness measurements are required. It is appropriate for professional machinists, quality control inspectors, and precision fabricators working with metal, plastic, or similar materials. The flat anvil configuration supports a wide range of standard workpiece geometries. The one-piece spindle design contributes to dimensional stability during repeated use across shifts or varying ambient conditions.

Key Features

• Measurement range of 0 to 1 inch with 0.0001 inch graduation
• Accuracy of 0.000050 inches for high-precision measurement work
• Ratchet stop thimble ensures consistent, repeatable measuring pressure
• Solid carbide measuring faces resist wear over extended service life
• Integrated digital counter for fast, unambiguous reading
• Ring lock nut included for spindle position retention; wrench also included
• Extremely hard and stable one-piece spindle construction

Compatibility

Designed as a standard outside micrometer suitable for general-purpose precision measurement applications requiring a 0 to 1 inch measuring range.

Installation Notes

This instrument is a hand-held precision measuring tool and does not require installation in the traditional sense. Before use, verify the micrometer reads zero with the anvil and spindle faces in clean contact, or use the included wrench to adjust the zero setting. Keep measuring faces clean and free of debris to maintain accuracy. Store in a protective case away from temperature extremes and magnetic fields to preserve calibration.