<VV> Screws and bolts

[Daniel Monasterio]

So what are 1/4"-20... bolts or screws ?I grew up knowing all machine threaded ones (those which accept machined nuts) as bolts and those commonly used on sheet metal (non machined threads or self threading) as screws. Could be wrong but any time and at every place I ask for a bolt (tornillo in my place) they show me what I know as a bolt. Same for screws (pijas in my place).Even the numbered nomenclature is different. 1/4"-20 means a bolt and #6-1 1/2" means an screw. They don`t sell screws by a measured diameter.Resuming what The Machinery's Handbook, 23 Revised Edition says near the end of  page 1277 , a bolt can accept a nut, an screw can't but, if that bolt is inserted into a machined hole and tightened by it's head, it is an screw.If I understood well, a 1/4"-20 fastener is a bolt if used and tightened with a nut but, an screw if inserted on a threaded hole (technically a nut to me) and tightened by the head.Concluding...... ?????????
As you say.... just my 2 pennies.
Daniel Monasterio

> From: hyarnell1 at earthlink.net
> To: virtualvairs at corvair.org
> Date: Tue, 26 Jun 2012 19:05:01 -0400
> Subject: <VV> Screws and bolts
> 
>  
> 
> If it's over 1/4-20. it's a bolt; under that, they're screws.
> 
> Assuming machine thread.
> 
>  
> 
>  
> 
> Harry Yarnell
> 
> Perryman Garage and Orphanage
> 
> hyarnell1 at earthlink.net 
> 
>  
> 
>  _______________________________________________
> This message was sent by the VirtualVairs mailing list, all copyrights are the property
> of the writer, please attribute properly. For help, mailto:vv-help at corvair.org
> This list sponsored by the Corvair Society of America, http://www.corvair.org/
> Post messages to: VirtualVairs at corvair.org
> Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs 
>  _______________________________________________