Retaining Rings & Clips

About retaining rings & clips

Retaining rings and clips are critical components for securing assemblies on shafts or within bores, preventing axial movement. They are broadly categorized by their mounting orientation: internal retaining rings fit into grooves within bores, and external retaining rings fit into grooves on shafts. Common types include stamped circlips (often conforming to DIN 471 for external and DIN 472 for internal applications), spiral retaining rings (multi-turn, groove-less designs for lighter loads), E-clips (E-shaped, radially installed for smaller shafts), and push-on retainers (friction-fit, groove-less, for low-load, non-precision applications). Selection criteria typically involve the shaft or bore diameter, the groove dimensions (diameter, width, depth), and the thrust load the ring must withstand. Material considerations include carbon spring steel (standard for general industrial use), stainless steel (for corrosion resistance, often 302 or 316), and beryllium copper (for non-magnetic or high-conductivity applications). Finishes such as phosphate and oil, zinc plating, or black oxide provide enhanced corrosion protection. Standardized series like ANSI, DIN, and JIS define dimensional characteristics and performance ratings for various ring types.