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These are 4mm Flanged Lock Nuts. Lock nuts can be used for wheels, slipper clutch springs, and other applications, which require easy removal and will not loosen due to vibrations.
- Nylon inserts which hold screw threads tight
- Four flanged locking nuts
- Total Flange Diameter: 9.6mm (.38")
- Thread Size: 4mm
- Height: 5.7mm (.23")