KP-55 Retaining Ring 5620K12

This retaining ring is a small but crucial component in the KP-series handpieces. The part number 520K12 is listed in KUPA’s parts catalogue under the “KP Parts” section for KP-55/KP-60 handpieces. Its role is to secure internal assemblies (e.g., bearing races, spindles, cams) by fitting into a groove and preventing axial movement of components. Features OEM-compatible fit: Designed to the original specifications of KUPA KP-55/KP-60 series handpieces. Form-factor: A thin steel ring (snap / circlip style) that fits into a groove in the handpiece’s internal assembly. Dimensionally defined: ID ~5.5 mm, OD ~8 mm, thickness ~0.4 mm. Installation Tips Ensure the groove in the handpiece you are working on matches the retaining ring dimensions (ID ~5.5 mm). Inspect the old ring: if it’s deformed, missing, or worn, replace it. During re-assembly, verify that the ring is fully seated in its groove and that nothing is bent or mis-aligned. Disconnect and power-off the handpiece before disassembling. Remove the front housing/collet and other components carefully to access the ring groove. Clean the groove and surrounding area of debris or metal shavings. Install the new #520K12 retaining ring using appropriate snap‐ring pliers or a delicate tool, making sure it clicks securely into the groove. Re-assemble the handpiece, then test it unloaded (no bit) at low speed to ensure everything runs smoothly and no component is loose or vibrating.