Starrett 53052 Tubular Micrometer 12 Inch Range

Product Description

The STARRETT 53052 is a mechanical tubular outside micrometer designed for measuring large-diameter workpieces and cylindrical parts across a 12-inch range. It reads to a graduation of 0.001 inches with an accuracy of 0.0001 inches, making it suitable for precision measurement tasks in manufacturing, metrology, and machine shop environments. The micrometer features a friction thimble for consistent measuring pressure and a satin chrome finish that resists glare and corrosion. Eight extension rods with a 3/8-inch diameter are included, each with hardened and ground anvils that are adjustable for length to build up the measurement range in 1/2-inch travel increments.

This tubular micrometer is used in industrial and precision trade settings where standard bench micrometers cannot span the required measurement range. Typical applications include measuring large-bore cylinders, pipes, structural components, and machined housings. The modular rod system allows the technician to configure the micrometer for the specific span needed without switching instruments. It is suited for use in machine shops, fabrication facilities, and quality control inspection stations where accurate large-span outside measurement is required.

Key Features

• 12-inch measurement range built up using eight interchangeable extension rods
• 0.001-inch graduation with 0.0001-inch accuracy for precision readings
• Friction thimble provides consistent, repeatable measuring pressure
• Hardened and ground anvils on rods are adjustable for length
• 3/8-inch rod diameter with 1/2-inch travel per rod increment
• Satin chrome finish reduces glare and improves corrosion resistance

Compatibility

Designed as an OEM-style precision measuring instrument for industrial and machine shop use where a large-span tubular outside micrometer with interchangeable extension rods is required.

Installation Notes

This instrument is handled and used by machinists, metrologists, and precision trade professionals. Before use, verify that all extension rods are fully seated and that anvil faces are clean and free of debris. Calibrate against a known standard before taking critical measurements. Store rods and the micrometer body in the provided case to protect calibrated surfaces.