Tab, Key & Notch Washers  
   
Used when necessary to keep a washer or nut from rotating
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Tab Lock 5748, 5749, 5745
Tab prevents washer from rotating
Ears prevent nut from rotating on washer
Tabs may lock into holes or over the edge of base material
Ears may be bent up by user to lock nut
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Formed Key 5739, 5740
Tab prevents washer from rotating
May have internal tab to prevent shaft from rotating
Tabs may lock into holes or over the edge of base material
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Tab 5741, 5742, 5744, 5743, 5746, 5747
May have one or more tabs and the tabs may be internal as well as external depending on application
Internal tabs locate washer on shaft
External tabs may be bent by user to lock nut
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Notch 5753, 5754, 5750, 5751
Generally used with a key to prevent rotation of the washer relative to the shaft
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Washer holds nut in place in relation to chassis.
Internal-External tab washer prevents nut from loosening.
Prevents shaft from turning.
Key locks shaft into washer and prevents it from turning.

Formed tab prevents washer from rotating or used as a stop.