Starrett 67682 Mechanical Micrometer 8 Inch Range

Product Description

The STARRETT 67682 is a mechanical outside micrometer designed for precision measurement in demanding shop and field environments. It covers a measurement range up to 8 inches with a graduation of 0.0003 inches and an accuracy of 0.000300 inches, making it suitable for high-tolerance inspection work. The ratchet stop thimble provides consistent measuring pressure across repeated measurements, reducing operator-to-operator variation. Measuring faces are solid carbide for long-term wear resistance. The instrument ships complete with a case, contacts, setting ring, instructions, and wrenches.

This micrometer is intended for use in precision machining, tool and die, metrology labs, and maintenance shops where tight dimensional tolerances must be verified. The 8-inch range addresses larger-diameter workpieces and components that standard 1-inch or 3-inch micrometers cannot reach. A single setting ring with a 7.0000-inch diameter is included for calibration verification. The gage depth of 4.5 inches and maximum extension rod length of 6.0000 inches extend measurement versatility on deep or recessed features. Machinists, quality control technicians, and toolmakers are the primary users.

Key Features

• Measurement range up to 8 inches with 0.0003-inch graduation for fine-resolution readings
• Ratchet stop thimble ensures repeatable, consistent contact pressure
• Solid carbide measuring faces resist wear on hardened and abrasive workpiece materials
• Includes setting ring, contacts, wrenches, and protective case for field-ready deployment
• Maximum extension rod length of 6.0000 inches for deep or extended measurement reach
• Three contact points provide stable, accurate seating on cylindrical or irregular surfaces

Compatibility

Designed as a standalone precision measuring instrument compatible with standard micrometer calibration and setting ring practices. The included 7.0000-inch diameter setting ring is matched to this instrument for field verification.

Installation Notes

This is a precision measuring instrument, not an installed component. Handle with care to avoid dropping or thermal shock, as either can affect calibration. Before use, verify the instrument against the included setting ring and adjust as needed using the provided wrenches. Store in the supplied case when not in use to protect the carbide measuring faces and maintain calibration stability.