[SEL] semi - ot lock washer questions for engineers

[Rob Skinner]

> Not sure what version of Machinery's Handbook you are 
> referring to, but my 17th  edition with pictures of square 
> bolts/nuts notes the flat surface on the underside.  


Hi Tom,
I was lazy and didn't bother to confirm what I thought I rememebered.  There's a
little more to it than I previously indicated.

In the 12th edition, they talk about the various finishes for bolts and nuts.

"Unfinished" means not machined or treated on any surface except the threads.

"Semi-finished" means a circular bearing surface or "washer face" is formed by
chamfering the edges.

"Finished" is the same as "semi-finished" except that surfaces other than the
bearing surface are treated to create a desired appearance.

"Washer face" is defined as a circular boss produced on a bearing surface of a
bolt or a nut to relieve the corners.  

=-=-=-=-=-=
Rob Skinner
La Habra, California
mailto:rskinner at rustyiron.com
http://www.rustyiron.com