Locking Nuts v. FLanged Nuts

69_340_GTS said

1st, you do need a large washer between the nut and the floorboard. Whether that washer is integral to the nut, or a separate part, it really does not matter. 2nd, while there is nothing wrong with blue Loctite and regular old nuts, the nylon locking nuts or "nylocks" are pretty nice.

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FYI, Nylocks have a maximum manufacturers recommended replacement/life span of 5 years. After 5 years, the nylon becomes brittle and starts to degrade, thus loosening up and eventually failing. Not something I'd want to retain a seat. something thats not as life/safety critical, then yes. And for your own sake, never re-use a Nylock. EVER. they are meant for one time tightening only.