Starrett 68125 Mechanical Micrometer 0.12 in Range

Product Description

The STARRETT 68125 is a mechanical inside micrometer designed for high-precision bore and internal diameter measurement. It features a ratchet stop thimble for consistent, repeatable gauging pressure and solid carbide measuring faces that resist wear over extended service life. Graduation is 0.0001 inches with a stated accuracy of 0.0001 inches, making this instrument suitable for close-tolerance inspection work. The two-contact-point design allows the gauge to seat cleanly inside bores and holes. Maximum extension rod length reaches 6 inches, extending the usable measurement range well beyond the base 0.12-inch capacity. Machinists, tool and die workers, and precision measurement technicians are the primary users.

The 68125 is suited for shop-floor and quality-control environments where internal diameter verification is required. Typical applications include inspecting precision bores, bushing IDs, and other small internal features in manufacturing and maintenance settings. The included setting ring, at 0.1000 inches diameter, allows the instrument to be zeroed before use. This micrometer ships with a case, contacts, instructions, a setting ring, and wrenches, providing everything needed for immediate deployment at a workstation or in a service kit.

Key Features

• Ratchet stop thimble delivers consistent gauging pressure for repeatable readings
• Solid carbide measuring faces provide extended wear resistance in high-use environments
• 0.0001-inch graduation and 0.0001-inch accuracy support close-tolerance inspection
• Maximum extension rod length of 6 inches expands usable measurement range
• Includes case, contacts, setting ring (0.1000 inches), wrenches, and instructions
• Two-contact-point design for stable seating inside bores

Compatibility

Designed as a standalone inside micrometer for general precision measurement applications requiring internal diameter gauging up to 0.12 inches base range with extension rod capability to 6 inches.

Installation Notes

This instrument requires no installation in a system; it is a handheld gauging tool. Before use, zero and verify calibration against the included setting ring following the enclosed instructions. Store the micrometer in the provided case when not in use to protect the carbide measuring faces and maintain calibration. Avoid dropping or applying lateral force to the spindle, as this can affect accuracy.