Original DeWalt 579212-00 — a small metal snap/retaining ring used to secure the spindle/hammer spring and keep the hammer/bit assembly in place. This original DeWalt ring is listed on parts diagrams as the RING for the gear/hammer assembly and is supplied as a single replacement item.

Example fitment includes a wide range of DeWalt drill / rotary-hammer models : DC212, DC222, DC223, DC232, DC233, D25103 (Type 1 & 2), D25203, D25213, D25211, D25113 rotary-hammers and cordless hammers DCH263 / DCH273 ). These model cross-references appear on DeWalt's parts lists.

Specifics: listed as item 579212-00, described in parts lists as a snap / retaining ring and commonly referenced as a “snap ring 21” — A  21 mm snap/retaining ring for the spindle / hammer area. It’s a compact metal retaining ring sold individually and is ideal when repairing the hammer/spindle assembly. Perfect to include when ordering other DeWalt spare parts for a repair.

(Note: always confirm your tool’s model and type against the parts diagram before installation.)