<HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1476" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV>Terry:</DIV> <DIV>The grade of bolt is related to its tensile strength ( among other things possibly ).  I have tested bolts in past jobs and know that the higher the bolt grade, the higher the torqe spec it can take........ i.e. tensile strength.</DIV> <DIV>Grade 3 is a very standard 'off the shelf' type bolt.  Grade 5 will be a stronger bolt and Grade 8 would be rated quite high in torque capacity for any given size.</DIV> <DIV>Not sure that helps, but that is some info.  If detail info is needed on grade of bolts, any machinist handbook will have that and i could look up specifics if someone needs it.</DIV> <DIV>As far as the coatings, i dont know how they are made, but I do know from testing that they can have an effect on actual clamp load achieved for any given torque applied due to different friction coefficients.</DIV> <DIV>again........not sure that helps anyone.</DIV> <DIV> </DIV> <DIV>Dave</DIV> <DIV></DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid"> <DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=joegarrett@earthlink.net href="mailto:joegarrett@earthlink.net">Joe Garrett</A> </DIV> <DIV style="FONT: 10pt arial"><B>To: </B><A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech</A></DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> 1/5/2005 10:16:22 PM </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Screw/McMaster-Carrq</DIV> <DIV><BR></DIV><FONT size=2> <DIV><FONT face=Arial size=2>Terry Farrell asked: "<FONT face="Times New Roman" size=3>Joe, can you translate any of this?"</FONT></FONT></DIV> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3>Most? Nope!! I suspect that the Black - Oxide, might be a bluing process, but not sure. So May be the Black finish, as well. What ever the "Corrosion-Resistant coating is anyone's guess. </FONT></FONT></DIV> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3>The grades? Not a chance! :-(</FONT></FONT></DIV> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3>It'd be nice if they spoke normal language. (like us P.Tuners!<G>)</FONT></FONT></DIV> <DIV><FONT face=Arial size=2><FONT face="Times New Roman" size=3>Regards,</FONT><BR></DIV></FONT> <DIV><FONT face=Arial size=2>Joe Garrett, R.P.T.<BR>Captain, Tool Police<BR>Squares R I</FONT></DIV></FONT></BLOCKQUOTE></BODY></HTML>