Starrett 50550 Inside Micrometer Set 8-32 in

Product Description

The STARRETT 50550 is a mechanical inside micrometer set designed for precise internal diameter measurements across a wide range of 8 to 32 inches. Built around a friction thimble mechanism with solid rods, this set delivers an accuracy of 0.0001 inches, making it a reliable tool for machinists, toolmakers, and metrology professionals working in manufacturing, maintenance, or quality control environments. The satin chrome finish reduces glare under shop lighting, and the hardened and ground anvils ensure consistent contact and long-term gauge integrity across repeated use cycles.

This inside micrometer set is suited for measuring large bores, cylinders, and internal features in industrial and manufacturing settings. It includes four extension rods, each insulated and marked with their length for quick identification, along with a carrying case to protect the set during storage and transport. The set covers measurements from 8 to 32 inches in 1-inch travel increments per head position, making it practical for a broad range of internal measurement tasks without requiring additional tooling.

Key Features

• Measurement range of 8 to 32 inches using four included solid extension rods
• Accuracy of 0.0001 inches for precision internal diameter measurement
• Friction thimble provides consistent feel and prevents over-tightening on the workpiece
• Hardened and ground anvils for durable, repeatable contact surface performance
• Insulated rods marked with length for fast rod selection during setup
• Satin chrome finish minimizes glare in well-lit shop and inspection environments
• Includes protective carrying case for organized storage and field transport

Compatibility

Designed as a standard mechanical inside micrometer set for use in industrial machining, quality control, and maintenance applications requiring internal diameter measurement over an extended range.

Installation Notes

Inside micrometers are installed and used by machinists, toolmakers, and metrology technicians. Before use, ensure the instrument is clean and at thermal equilibrium with the workpiece to avoid measurement error from thermal expansion. Follow the manufacturer calibration procedures before beginning a measurement sequence, and store the set in its case with rods separated to prevent contact damage to the anvils and measuring surfaces.