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The KUPA Connecting Bolt #520K04 is a metal bolt that has been precisely machined to fit the front-end assembly of the KP-55 and other handpieces in the KUPA KP series.

KP-55 Connecting Bolt 520K04

by Ovation Spas
$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00

The KUPA Connecting Bolt #520K04 is a precision-machined metal bolt designed for the front-end assembly of the KUPA KP‐series handpieces (specifically the KP-55). It serves as a critical structural component, securing internal assemblies (such as rotors, spindles or housings) to ensure alignment, stability and high-speed performance. With wear or damage to this bolt, the handpiece might exhibit looseness, increased vibration or mis-alignment. This bolt matches OEM specs and is intended to restore proper fit and function.

Features

  • OEM Fit: Direct replacement for KUPA KP-55 handpieces, part number 520K04. 

  • Dimensions:

    • Outside Diameter (O.D.): approx. 19.91 mm (0.75″) 

    • Inside Diameter (I.D.): approx. 11.56 mm (0.45″) 

    • Length: approx. 29.47 mm (1.16″) 

  • Material: High-speed compatible metal, designed for the rotational demands of nail-drill handpieces.

Installation Tips

  • Verify your current bolt’s dimensions and part number match 520K04 (O.D. ~19.91 mm, I.D. ~11.56 mm, length ~29.47 mm).

  • Ensure that the handpiece you are servicing is indeed a KP-55 (or variant that uses 520K04) — other series may use different bolts.

  • Power off and unplug the handpiece before disassembly.

  • Remove the front housing and other relevant components to access the old bolt.

  • Clean the bolt thread and housing area of debris, lubricant residue or metal shavings.

  • Thread the new 520K04 bolt in carefully, ensuring proper torque (do not over-tighten, which could damage threads or housing).

  • Re-assemble the handpiece, then perform a no-load test run to confirm smooth rotation, no abnormal vibration and secure assembly.