Starrett 52999 Anvil Micrometer 42 to 48 Inches

Product Description

The STARRETT 52999 is a mechanical interchangeable anvil micrometer covering a measurement range of 42 to 48 inches. It uses a friction thimble and a ring-style lock nut to hold precise settings during use. Graduation is 0.001 inches, providing the resolution required for close-tolerance work on large-diameter shafts, bores, and machined surfaces. The spindle and anvil are steel construction. The set ships with standards for 43, 45, and 47 inches, a lock nut, and a wrench, making it ready for calibrated use out of the box. This instrument is intended for skilled machinists and metrology technicians working in production or toolroom environments.

This micrometer is used in applications requiring accurate outside measurement of large workpieces in the 42 to 48 inch range. Typical install scenarios include heavy machining, engine reconditioning, large-bore inspection, and precision manufacturing quality control. The interchangeable anvil design allows the same frame to cover multiple ranges within the set, reducing equipment cost for shops that need coverage across several large-diameter ranges.

Key Features

• 42 to 48 inch measurement range with 0.001 inch graduation
• Friction thimble for consistent measuring pressure and repeatable readings
• Ring-style lock nut secures the spindle position after measurement
• Interchangeable anvil design with 2 anvils included
• Steel spindle and steel anvil material for durability in shop environments
• Includes 43, 45, and 47 inch standards plus lock nut and wrench

Compatibility

Designed as a direct-use large-range outside micrometer for toolroom and production inspection where measurements between 42 and 48 inches are required. No specific machine or system compatibility data was provided.

Installation Notes

This instrument is set up and used by machinists or metrology technicians; no installation trade license is required, but proper calibration procedure should be followed using the included standards before taking measurements. Store the micrometer in its case when not in use to protect the spindle and anvil faces from damage. Do not use power tools to adjust the spindle. Clean and inspect contact surfaces before each use to ensure accurate readings.