Starrett T444.1XRL-1 Outside Micrometer 1 in Ratchet Stop

Product Description

The STARRETT T444.1XRL-1 is a mechanical outside micrometer built for precise dimensional measurement of external workpiece features. It covers a 1 inch measurement range with a graduation of 0.0001 inches and an accuracy of 0.000050 inches, making it well suited for applications where close-tolerance verification is required. The thimble uses a ratchet stop mechanism to deliver consistent measuring pressure across repeated readings. Solid carbide measuring faces extend service life and maintain flatness under regular use. A rotating spindle and ring-type lock nut are included for secure, repeatable setup. This tool is used by machinists, metrologists, and quality technicians in production and inspection environments.

The T444.1XRL-1 is appropriate for shop floor measurement of shafts, pins, bosses, and similar turned or ground components where external diameter or thickness must be confirmed to tight tolerances. The satin chrome finish reduces glare under shop lighting and provides corrosion resistance during normal handling. The included case and wrench support organized storage and on-site spindle adjustment. It is packaged individually and suits both bench inspection and in-process checks at a machining center.

Key Features

• 1 inch measuring range with 0.0001 inch graduation for high-resolution readings
• Accuracy of 0.000050 inches for close-tolerance dimensional inspection
• Ratchet stop thimble delivers consistent measuring pressure on every use
• Solid carbide measuring faces resist wear and maintain flatness over time
• Rotating spindle and ring lock nut for secure, stable readings
• Satin chrome finish reduces glare and resists corrosion during shop use
• Includes protective case and wrench for storage and field adjustment

Compatibility

Designed as a standalone mechanical outside micrometer suitable for general-purpose external measurement tasks in machining, inspection, and quality control applications.

Installation Notes

Outside micrometers require no installation but should be calibrated against a known standard before use and verified periodically during measurement sessions. Clean measuring faces with a lint-free cloth before each use to remove chips, oil, or debris that could affect readings. Store the micrometer in its included case when not in use to protect the measuring faces and thimble mechanism. Calibration and adjustment should be performed by a qualified metrologist or tool technician following the manufacturer wrench procedure.