This is a fine thread lock nut designed for ballscrew assemblies used in CNC milling routers. It provides secure, precise locking to minimize backlash and preserve accuracy in precision motion systems. Key benefits Reduces backlash in ballscrew nut assemblies, improving repeatable positioning Maintains nut alignment under vibration and during heavy cuts Easy installation and reliable locking with minimal maintenance Suitable for use in CNC milling routers and similar equipment Key attributes Functionality: Fine thread lock nut for ballscrew systems Compatibility: Designed for ball screws sized 1605, 2005, 2505, and 3205 Sizes available: M10x1, M12x1, M15x1, M17x1, M20x1, and M25x1.5 Material: Not specified in the listing Packaging: 1 piece per unit (as indicated by 1Pcs in the product title) Supported ball screw models 1605 2005 2505 3205 Applications and use cases Upgrade or retrofit a CNC milling router by replacing loosened lock nuts on 1605/2005/2505/3205 ball screws to restore precision and reduce play Retrofit existing hobby or small business CNC machines to improve rigidity and accuracy on X, Y, and Z axes Use in CNC builds where a fine thread lock nut is required to secure the ball screw end and prevent nut migration during operation How to use Select the correct thread size that matches your ballscrew end nut thread (choices include M10x1, M12x1, M15x1, M17x1, M20x1, and M25x1.5) Install the lock nut onto the ballscrew and tighten as required by your machine's specification Ensure proper seating to achieve secure locking and maintain axis precision during operation Notes The listing specifies multiple thread sizes and ball screw compatibility; choose the size that matches your equipment Material details are not provided in the listing; please refer to your supplier for material specifications if needed This lock nut offers a practical solution for enhancing precision and reliability in CNC milling and routing applications by providing a secure, fine threaded lock for ballscrew assemblies.