Starrett 72268 Ratchet Stop Micrometer Accessory

Product Description

The STARRETT 72268 is a ratchet stop accessory designed for use with Starrett 436 series micrometers. A ratchet stop controls the amount of force applied during measurement, ensuring consistent thimble rotation and repeatable readings across multiple uses. This component is a direct replacement or spare part for technicians and machinists who rely on the Starrett 436 micrometer in precision measurement work. The 72268 ships as a single unit and weighs 1 pound. It is not calibrated and does not include a traceability certification, making it a straightforward mechanical replacement part rather than a calibrated assembly.

This ratchet stop is suited for machine shops, tool rooms, quality control environments, and field service applications where a Starrett 436 micrometer is in regular use. When the existing ratchet stop shows wear or inconsistent slip behavior, replacing it restores reliable torque-limiting function to the micrometer. Technicians performing precision measurements on machined parts, tooling, or components benefit from a properly functioning ratchet stop to maintain measurement accuracy and reduce operator-induced variation.

Key Features

• Ratchet stop function limits thimble torque for consistent, repeatable measurements
• Direct replacement accessory for the Starrett 436 micrometer series
• Single-unit packaging suitable for individual replacement or spare inventory
• Non-calibrated mechanical component — no certification required for this part type

Compatibility

Designed for use with the Starrett 436 micrometer series as stated by the manufacturer.

Installation Notes

Installation of a ratchet stop should be performed by a qualified machinist or metrologist familiar with micrometer disassembly and reassembly procedures. Before servicing, ensure the micrometer is clean and free of debris to avoid contaminating the measuring faces or spindle threads. Avoid applying excessive force during installation, as internal micrometer components are precision-machined to close tolerances. After reassembly, verify smooth ratchet engagement and confirm the micrometer reads correctly against a known standard before returning it to service.