NTN SNR: MB2 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: 3413520529819 EAN: 3413520529819 MB2 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: 15mm MFR Part No.: MB2 Outside Diameter: 28mm Thickness: 1mm