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High-speed copper washer, OEM KUPA KP-55 cup washer #520K19. guarantees appropriate nail-drill handpiece spacing, alignment, and durability at high speeds.

KP-55 Washer 520K19

by Ovation Spas
$6.00 - $6.00
$6.00
$6.00 - $6.00
$6.00

The 520K19 is a cup washer (a kind of washer with a curved/cupped profile) used in the KP-55 handpiece. It’s part of the internal front-end assembly, fitting between components to maintain spacing, alignment, and absorb minor axial loads. It helps keep the internal geometry precise in a high-speed tool.

Features

  • Maintains spacing & alignment: The cup washer ensures that nearby components (e.g. bearings, shafts, front housing) keep proper clearance and alignment.

  • Absorbs axial force: The “cup” profile allows it to slightly flex or bear against two surfaces, reducing micro-movement under axial loads.

  • Enhances durability: Because it’s an OEM copper part, it is designed to withstand the wear and heat generated in the rotating front section of the KP-55.

  • Ease of replacement: Swapping it out when worn helps prevent damage to adjacent parts (bearings, collars, housings) and helps restore smooth operation.

Dimensions

  • Inside Diameter (ID): ~ 7.98 mm 

  • Outside Diameter (OD): ~ 10.17 mm 

  • Thickness (height): ~ 5.47 mm 

  • Material: Copper — suited for durability under high-speed conditions

Installation Tips

  • Confirm the existing washer in your handpiece matches these dimensions (ID, OD, thickness).

  • Ensure that the mating surfaces and adjacent parts (spindle nose, bearing housing, front housing) are clean and undamaged — if they’re scored or deformed, the new washer may not seat properly.

  • Disconnect power and let the handpiece stop completely before disassembly.

  • Remove the front housing or collet assembly to access the washer location.

  • Carefully remove the old washer, noting its orientation (which side faced which component).

  • Clean seating surfaces (remove debris, metal shavings, old lubricant).

  • Insert the new 520K19 washer in the same orientation, ensuring it sits flat and fully seated.

  • Reassemble the front section and run the handpiece under no load first to check for smooth rotation, correct alignment, and absence of vibration or noise.