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Thread: Crank Question?????????
          
   
   

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  1. #6
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
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    Quote Originally Posted by kitz View Post
    4340 is a stronger and tougher (as in fatigue resistance) alloy than 5140.

    Kitz
    yes your right and 300m it better yet. better know as 300M timken $$ they are all alloys of steel with a mix of many thing .the first number indicates class like the 40 in which the steel belongs in like carbon molybdenum steel and fine grain after carburizing are at there maximum physical properties THE 5140 steels are chromiun alloy and may interchangealby with alloys of 2340 3140 if you want to know more about steel the machinerys handbook is handy i have other books on make up of steel and iron but this stuff falls out of my head
    Last edited by pat mccarthy; 12-19-2008 at 07:53 PM.
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