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The KP-series handpieces depend on this tiny but essential retaining ring. The KP-55/KP-60 handpiece parts section of KUPA lists part number 520K12.

KP-55 Retaining Ring 5620K12

by Ovation Spas
$5.00 - $5.00
$5.00
$5.00 - $5.00
$5.00

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.