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Nut #520K23 is an OEM replacement for KUPA KP-55 handpieces. A crucial component for fastening internal assemblies in nail-drill handpieces is copper construction.

KP-55 Nut 520K23

by Ovation Spas
$7.00 - $7.00
$7.00
$7.00 - $7.00
$7.00

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.