Starrett 67681 Mechanical Micrometer 7 Inches Range

Product Description

The STARRETT 67681 is a mechanical outside micrometer designed for precision measurement in demanding trade and industrial applications. It covers a maximum measurement range of 7 inches and delivers an accuracy of 0.0003 inches, making it suitable for close-tolerance inspection work. The ratchet stop thimble provides consistent measuring pressure, reducing operator error during repeated measurements. Measuring faces are solid carbide for durability and resistance to wear over extended service life. This instrument is intended for use by machinists, toolmakers, metrologists, and quality control technicians working in manufacturing, fabrication, or precision maintenance environments.

The STARRETT 67681 is suited for large-diameter or long-span external measurement tasks in machine shops, production floors, and maintenance facilities. Its 3-contact-point design and included setting ring support accurate calibration at the 7-inch range. The gage depth of 4.5 inches and maximum extension rod length of 6 inches accommodate a range of workpiece geometries. This micrometer is appropriate for measuring large shafts, bores, housings, and fabricated components where standard-range micrometers fall short.

Key Features

• Maximum measurement range of 7 inches for large-span external measurement
• Accuracy of 0.0003 inches and graduation of 0.0003 inches for high-precision readings
• Ratchet stop thimble delivers consistent, repeatable measuring pressure
• Solid carbide measuring faces resist wear and extend instrument service life
• 3-contact-point design paired with a 7-inch setting ring for reliable field calibration
• Includes case, contacts, instructions, setting ring, and wrenches for complete out-of-box readiness

Compatibility

Designed as a standalone precision measuring instrument for external dimensions up to 7 inches. Compatible with standard micrometer accessories and extension rods up to 6 inches in maximum length.

Installation Notes

Micrometers of this class are handled and calibrated by qualified metrology or machinist personnel. Before use, verify calibration with the included setting ring and allow the instrument to thermally stabilize to the ambient environment. Store in the provided case when not in use to protect measuring faces. Do not drop or overtighten the thimble, as this can affect calibration and damage the carbide faces.