<VV> Bolt Grades

[jwcorvair at aol.com]

-----Original Message-----
From: John Kepler <jekepler at amplex.net>
To: 'Chris & Bill Strickland' <lechevrier at earthlink.net>; 'VirtualVairs' <virtualvairs at corvair.org>
Sent: Fri, Nov 13, 2009 3:59 pm
Subject: Re: <VV> Bolt Grades



>
I have not done any comparative testing of bolts, but what I understand 
s that while Grade 8 (and higher) bolts do have a higher tensile 
trength, they are overall more brittle than Grade 5 bolts, and are not 
erhaps the de facto 'best choice' for some applications, especially 
hose taking a lot of high shock loads and abrasive wear. 
Absolutely incorrect!  Grade 8's are LESS brittle than Grade 5's based on
he fact that they are alloy steel rather than Low-Carbon steel.  And the
umbers are:
SAE Grade 5:  1/4-1"
 Proof Strength:  85,000 PSI
 Tensile Strength:  120,000 PSI
 Material:  Low-Carbon Steel, Quenched & Tempered
SAE Grade 8:  1/4-1"
 Proof Strength:  120,000 PSI
 Tensile Strength:  150,000 PSI
 Material:  Medium-Carbon Alloy (Mb) Steel, Quenched & Tempered

 _______________________________________________
his message was sent by the VirtualVairs mailing list, all copyrights are the 
roperty
f the writer, please attribute properly. For help, mailto:vv-help at corvair.org
his list sponsored by the Corvair Society of America, http://www.corvair.org/
ost messages to: VirtualVairs at corvair.org
hange your options: http://www.vv.corvair.org/mailman/options/virtualvairs 
_______________________________________________