From: muratlanne@gmail.com   
      
   "Snag"  wrote in message news:10khfli$32071$1@dont-email.me...   
      
      I was installing some turnbuckle/chain sway control on the 3 point   
   hitch on my "new" tractor , and I was inattentive (I fucked up) and bent   
   the tension rods on my HF hydraulic jack press while pressing some bolts   
   out of the lower lift arms. I want to replace rather than straighten and   
   I'm thinking 4140 might be a good choice . I've replaced the 12 ton jack   
   it had originally with a 20 ton unit ...   
      The original rods are 3/4" , I don't know what they're made of . I   
   can get enough 4140 in 3/4" for a not-outrageous price to have a couple   
   of feet left over for future projects . I figure the max tension load on   
   each will be around 20,000 pounds which should be well within the limits   
   of 4140 . Threads will be single point cut NF .   
      Unless someone can recommend a better alloy for this ... I only want   
   to do this once !   
   --   
   Snag   
   -----------------------------   
   The root dia spec for 3/4-16 is 0.68", which gives an area of 0.363 square   
   inches. 20,000 Lbs is 55,000 PSI.   
      
   https://www.azom.com/article.aspx?ArticleID=6769   
   "Yield strength     415 MPa     60200 psi"   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)