KP-55 Nut 520K23

This precision metal nut (part #520K23) is a genuine replacement component designed for the KUPA KP-55 (and compatible KP-series) nail-drill handpieces. It plays an essential role in securing internal assemblies or components, maintaining proper assembly integrity under high-speed rotation and preventing loosening or misalignment over time. Features OEM-correct fit: Specifically shown in KUPA’s “KP-55 Parts” list as Nut #520K23.  Dimensions: Inside triangle size: ~6.58 mm  Outside diameter: ~11.86 mm  Length (height): ~10.50 mm  Material: Copper — a material choice suited for high-speed handpiece parts. Installation Tips Verify that your handpiece’s existing nut dimensions and form match the listed specs (6.58 mm inner triangle size, 11.86 mm OD, 10.50 mm length). Check that your particular handpiece variant (revision, model year) uses the part #520K23 — some version changes may alter certain component numbers. Ensure the handpiece is unplugged and fully stopped before starting. Disassemble to access the nut location (likely inside the spindle/rotor or housing assembly). Remove the old nut, clean the threaded post and surrounding surfaces of any debris or old lubricant. Thread in the new 520K23 nut, ensuring correct torque (tight enough to seat securely but avoid over-tightening). Reassemble the handpiece and run it unloaded at low speed to check for smooth operation and no looseness or vibration.