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The KENNAMETAL 1020382 is a DA200 series collet locknut designed to secure collets within DA200-style toolholding systems on CNC machining centers and manual milling machines. The locknut threads onto the collet chuck body and applies clamping force to seat the collet and hold cutting tools firmly during operation. Proper locknut engagement is critical to minimizing runout and preventing tool pullout under cutting loads. This replacement locknut weighs 1 pound and is sold as a single unit, making it a direct drop-in service part for shops maintaining DA200 toolholding inventory.
The 1020382 locknut is suited for machine shops, tool cribs, and production environments running DA200 collet chucks. It is used in both light finishing operations and heavier roughing applications where consistent clamping force is required. Toolroom technicians and CNC setup personnel are the typical installers. Keeping a replacement locknut on hand reduces downtime when a worn or damaged nut needs to be swapped out between jobs.
Designed as a direct replacement locknut for DA200 series collet chucks. Confirm collet series designation on your toolholder body before ordering to ensure proper thread and taper engagement.
Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe lockout state before removing or installing any toolholding components. Clean the chuck threads and collet taper seating surfaces before threading on the new locknut. Use the appropriate DA200 spanner wrench to achieve proper torque engagement without damaging the nut or chuck body.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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