Starrett T444.1XRL-3 Outside Micrometer 3 in

Product Description

The STARRETT T444.1XRL-3 is a mechanical outside micrometer designed for precise external dimensional measurement in machining, fabrication, and metrology applications. It delivers a maximum measurement range of 3 inches with a graduation of 0.0001 inches and an accuracy of 0.0001 inches, making it a reliable tool for work that demands tight tolerances. The micrometer features a ratchet stop thimble for consistent measuring force and a rotating spindle for smooth, controlled advancement. Solid carbide measuring faces resist wear over extended use. This instrument is used by machinists, tool and die makers, quality control technicians, and precision tradespeople who require repeatable, high-accuracy linear measurements in shop or field environments.

The T444.1XRL-3 is suited for external measurement of shafts, pins, stock material, and machined components in both production and inspection settings. The flat anvil type accommodates a wide range of workpiece geometries. It ships with a protective case and a wrench, making it ready for immediate deployment at a workbench or inspection station. The satin chrome finish reduces glare and corrosion during regular shop use. This micrometer is appropriate for any trade or industrial environment where dimensional accuracy to 0.0001 inches is required on workpieces up to 3 inches.

Key Features

• 3-inch maximum measurement range with 0.0001-inch graduation for high-resolution readings
• Accuracy of 0.0001 inches for tight-tolerance inspection work
• Ratchet stop thimble provides consistent, repeatable measuring pressure
• Solid carbide measuring faces for extended wear resistance
• Ring-style lock nut secures the spindle position during reading or transfer
• Satin chrome coating reduces glare and protects against corrosion
• Includes protective case and wrench for storage and adjustment

Compatibility

Designed as a standard mechanical outside micrometer for external dimensional measurement of cylindrical and flat workpieces up to 3 inches in diameter or thickness.

Installation Notes

Calibration and use of precision measuring instruments should be performed by qualified machinists or metrology technicians familiar with proper zeroing and anvil-cleaning procedures. Before use, clean both measuring faces with a lint-free cloth and verify the zero setting against a calibrated standard. Do not overtighten the spindle or force the thimble, as this can damage the measuring faces or affect calibration. Store the micrometer in its case when not in use to protect the carbide faces and maintain accuracy.