NTN SNR: KM1 Lock Nut Used primarily to help lock and locate bearings on shafts or adaptor sleeves. They have evenly spaced slots on the circumference for use with the SNR range of hook spanners. MPN: KM1 EAN: 3413520529390 KM1 Lock Nut Attributes: Appropriate Locking Washer: MB1 Inside Diameter: 12mm MFR Part No.: KM1 Thread Size: M12 x 1 Width: 4mm