Starrett 68015 Outside Micrometer 3 Inch Range

Product Description

The STARRETT 68015 is a mechanical outside micrometer designed for precision dimensional measurement in machine shops, fabrication environments, and field inspection work. It covers a measurement range up to 3 inches with a graduation of 0.0001 inches and an accuracy of 0.000050 inches, making it suitable for close-tolerance work where hand-tool metrology is required. The thimble uses a friction-style drive to prevent overtightening on the workpiece. A ring-type lock nut secures the spindle position for repeated readings. Machinists, toolmakers, quality control technicians, and precision fabricators are the primary users of this instrument.

This micrometer is suited for measuring outside diameters, thicknesses, and widths of machined components, stock material, and assemblies in both shop and field settings. The solid carbide measuring faces on the anvil and spindle resist wear during high-cycle use on hardened or abrasive workpieces. The hammertone and baked enamel coating provides corrosion resistance in typical shop environments. The instrument ships with a lock nut and wrench for setup and adjustment.

Key Features

• 3 inch maximum measurement range with 0.0001 inch graduation
• Accuracy of 0.000050 inches for close-tolerance inspection work
• Friction thimble prevents overtightening and protects workpiece surfaces
• Solid carbide measuring faces on both anvil and spindle for extended wear life
• Ring-type lock nut with included wrench for secure spindle locking
• Hammertone and baked enamel finish for shop durability

Compatibility

Designed as a standard outside micrometer for general precision measurement applications. Compatible with typical micrometer standards and gauge blocks used for calibration in shop metrology programs.

Installation Notes

This instrument requires no installation, but proper calibration before use is essential. Verify the zero setting against a calibration standard or gauge block before taking measurements. Store in the included case or a protected location away from temperature extremes and moisture to maintain accuracy. Technicians should consult applicable shop metrology procedures and quality standards when using this instrument for inspection or acceptance criteria.