Starrett 55946 Mechanical Micrometer Head 1 Inch

Product Description

The STARRETT 55946 is a mechanical micrometer head designed for precision measurement in tooling, machining, and instrumentation applications. It provides a 1-inch measurement range with accuracy to 0.0001 inch, making it suitable for tasks that demand fine resolution. The head features a flat spindle measuring 0.235 inches in diameter and 1.25 inches long, a satin chrome finish, and an advanced sleeve design with staggered lines and distinct figures for fast, reliable readings. At 5.5 inches in overall length, this unit suits bench-mounted fixtures, jigs, and custom measuring setups. Machinists, tool and die makers, and metrology technicians are the typical end users.

This micrometer head is used in precision machining environments where a standalone measuring head must be integrated into a fixture, machine slide, or custom gauge assembly. The 0.4999-inch diameter stem is 0.75 inches long and fits standard micrometer head mounting bores. A 5/8-inch ratchet stop thimble is included, providing consistent measuring force and repeatable readings across multiple measurements. The part ships as a single unit with a minimum order quantity of one.

Key Features

• 1-inch measurement range with 0.0001-inch accuracy for high-resolution work
• 5/8-inch ratchet stop thimble for consistent, repeatable measuring force
• Flat spindle, 0.235 inches in diameter and 1.25 inches long
• Advanced sleeve design with staggered lines and distinct quick-reading figures
• Satin chrome finish for corrosion resistance and low-glare readability
• Steel measuring face for durability under repeated contact

Compatibility

Designed as an OEM-style mechanical micrometer head for integration into precision fixtures, jigs, machine slides, and custom gauge assemblies that accept a 0.4999-inch diameter stem.

Installation Notes

Installation is performed by machinists or metrology technicians. The stem is pressed or secured into a matching bore on the receiving fixture using appropriate clamping hardware. Ensure the mounting surface is clean and free of debris before seating the stem. Do not apply lateral force to the spindle during installation, as this can affect accuracy and spindle alignment.