Starrett 50546 Inside Micrometer Set 2 to 12 Inches

Product Description

The STARRETT 50546 is a mechanical inside micrometer set designed for precise internal bore and diameter measurement across a 2 to 12 inch range. Built around a friction thimble design with solid rods, the set delivers accuracy to 0.0001 inches per reading. The satin chrome finish resists glare and corrosion under shop conditions. Hardened and ground anvils provide repeatable contact geometry across the full measurement range. Insulated rods marked with their length speed up rod selection during measurement. This set is used by machinists, tool-and-die workers, and precision measurement technicians working in manufacturing, maintenance, and quality control environments.

The 50546 is suited for shop floor and inspection room use where internal measurements of bores, cylinders, and housings are required. The 10 extension rods extend the range from 2 to 12 inches, making the set appropriate for a wide variety of workpiece sizes. Quick-reading figures on the thimble reduce reading errors during high-volume inspection. A fitted case is included for organized storage and transport of rods and the measuring head.

Key Features

• Measurement range of 2 to 12 inches using 10 included solid extension rods
• Accuracy to 0.0001 inches for precise bore and diameter readings
• Friction thimble provides consistent measuring force and repeatable results
• Hardened and ground anvils for reliable contact and long service life
• Insulated rods marked with length for fast identification and rod changes
• Quick-reading figures on the thimble scale reduce operator error
• Satin chrome finish minimizes glare and resists corrosion

Compatibility

Designed as a general-purpose mechanical inside micrometer set for use in standard machining, manufacturing, and precision inspection applications where internal bore measurements between 2 and 12 inches are required.

Installation Notes

Inside micrometers are installed and used by machinists and metrology technicians; no permanent mounting is required. Before use, verify that all contact surfaces and rods are clean and free of debris to avoid measurement error. Store extension rods in the provided case to prevent damage to the hardened anvil surfaces. Follow shop calibration procedures and applicable metrology standards to maintain measurement traceability.