NTN SNR: MB5 Lock Washer Tab washers are used for securing KM series lock nuts. They have an inner tab for location on the adaptor sleeve. One of the external tabs is bent over a slot when used wit the KM series lock nuts. MPN: 3413520530174 EAN: 3413520530174 MB5 Lock Washer Attributes: For Use With: Tab Washers are Used for Securing KM Series Lock Nuts. They Have An Inner Tab for Location on the Adaptor Sleeve. One of the External Tabs is Bent Over a Slot When Used with the KM Inside Diameter: 25mm MFR Part No.: MB5 Outside Diameter: 42mm Thickness: 1.2mm