Starrett 67857 Mechanical Micrometer 9 Inch Range

Product Description

The STARRETT 67857 is a mechanical outside micrometer designed for precision measurement up to 9 inches. It features a ratchet stop thimble that delivers consistent measuring pressure on every reading, reducing operator error during repetitive measurement tasks. The measuring faces are solid carbide, providing long-term wear resistance in shop environments. Graduation is 0.0003 inches with an accuracy of 0.0003 inches, making it suitable for applications where tight dimensional tolerances must be verified. This instrument is intended for use by machinists, quality control technicians, and toolroom professionals who require reliable, traceable measurements without digital electronics.

The 67857 is built for applications requiring large-range outside diameter or linear measurement, covering a full 9-inch span. The 3-point contact design and included 9-inch setting ring allow the user to calibrate and verify the instrument against a known standard. A maximum extension rod length of 6 inches expands measurement versatility. Typical use cases include verifying turned shafts, large-diameter workpieces, and precision-machined components in industrial and manufacturing settings. The instrument ships complete with a case, contacts, setting ring, wrenches, and instructions, making it field-ready out of the box.

Key Features

• 9-inch maximum measurement range for large workpiece applications
• Ratchet stop thimble ensures consistent, repeatable measuring force
• Solid carbide measuring faces resist wear on hardened and abrasive workpiece materials
• 0.0003-inch graduation and 0.0003-inch accuracy for tight-tolerance inspection
• 3-point contact design with one 9-inch setting ring included for calibration
• Maximum extension rod length of 6 inches adds measurement range flexibility
• Complete kit includes case, contacts, setting ring, wrenches, and instructions

Compatibility

Designed as a standalone precision measuring instrument for outside diameter and linear measurements up to 9 inches. No specific system or machine compatibility applies. Verify that the measurement range and graduation suit the tolerance requirements of your application before use.

Installation Notes

This instrument requires no installation. Before use, clean all measuring faces and the setting ring contact surfaces with a lint-free cloth. Calibrate the micrometer against the included 9-inch setting ring prior to first use and periodically during production runs. Store in the provided case when not in use to protect the carbide faces and spindle threads from shop contamination.