internal vs. external tooth lock washers
internal vs. external tooth lock washers
(OP)
Any science behind the decision to use an internal vs and external tooth lock washer? I try to use external since you make the most out of the diameter. I only use internal tooth for cosmetic appearances.





RE: internal vs. external tooth lock washers
I have to say I came to same conclusion as yourself.
Cheers!
RE: internal vs. external tooth lock washers
RE: internal vs. external tooth lock washers
It is true though that the bottom surface of a nut generally bulges slightly, so it's contact patch is circular or annular and slightly further from the threads the nut is put onto than an equivalent bolt's contact patch would be. The pressure distribution under the head of a bolt compared to under a nut is probably slightly different too.
Specifying the washer so the teeth line up with this contact patch could lead to externally toothed washers being used under nuts and internally toothed washers used under bolts. Never really thought about it before though.