KP-55 Spring 520K10

A precisely constructed coil spring, the Spring #520K10 is intended for use in KUPA KP-series handpieces.  It is essential for keeping internal parts (such the spindle, collet, or rotor assembly) properly tensioned and aligned.  Replacing this spring can assist restore consistent performance, stable bit hold, and smooth operation as springs can become less elastic, distort, or wear out over time. Features OEM-correct fit: Listed as part of KUPA’s “KP Parts” lineup specifically for the KP-series handpieces.  Specifications: Outside Diameter: ~ 6.42 mm (0.25″)  Length: ~ 16.93 mm (0.66″)  Material: Steel, high-speed rated. Installation Tips Confirm your handpiece currently uses a spring at the specified location with matching dimensions (6.42 mm OD, 16.93 mm length) to ensure correct fit. Disassemble the handpiece with care — ensure power is off and the tool is safely disconnected. Remove the old spring, clean the surrounding housing of debris or residue, then install the new spring, ensuring it seats properly and aligns with adjacent components. After reassembly, run the handpiece with no bit (or light load) to check for smooth operation, correct tension, and absence of abnormal vibration or noise.