[GreenKeys] Model 28 Leveler Bolt is 1/2-13 x 1 1/2 !!!

[WA5CAB at cs.com]

I will point out that you aren't likely to find bolts with the head shown 
at consumer grade places like Home Depot. 1/2"-13 UNC is one of the two 
common thread diameters and pitches. But the head thickness is going to be 
roughly 3X that shown. And probably the 1/2" (length) of shank nearest the head 
will be unthreaded. Standard spec for Hex Head Cap Screws (the proper name) is 
that lengths from 0 to 1" are threaded to the head. Over 1". only 1" is 
threaded. If the length is over 1" and it is threaded to the head, it's usually 
either a specialty fastener or a machine screw. The screw pictured is a 
specialty.

REF: Machinery's Handbook, any Edition since 1914. 

Note that by definition in various standards, a screw is always or normally 
intended to be tightened or loosend by turning its head. A bolt is always 
or normally intended to be tightened or loosened by turning the nut into 
which it is inserted. Thus, clearly, the item pictured below is a screw, not a 
bolt. :-) My cataracts notwithstanding.


In a message dated 3/16/2010 10:22:53 PM Central Standard Time, 
k9tty at dls.net writes: 
> I double checked the size with my thread gauge and micrometer...
> 
> As Randy wrote the size is 1/2-13.  I must have misread the label at  
> Home Depot.
> 
> I guess my eyes are going bad I will go see the eye doctor...
> 
> Don
> 
> 
> 
> 
> 
> 
> 
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480 
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