From: none@none.com99   
      
   On 1/17/2026 7:14 PM, Snag wrote:   
   >    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 !   
      
   4140 should be as good as you can get in a relatively common alloy.   
   1144 is also very strong, much more easily machined, but not as weldable   
   (hot short), and not as rust resistant.  If I had 4140 on hand I would   
   use it, but for alloy steel my local yards only have 1144 and stainless   
   (304).  304 is more easily (in my opinion) welded than 4140.   
      
   First off.  I don't know what high tension rods you are referring to.  I   
   have jack style 12 and 20 ton presses.  I don't think they have those.   
   Which leads us into the next part.   
      
   The cross pins that support the table on the press can support the full   
   force of the hydraulic.  I can tell you first hand you will either tear   
   the upright construction steel or bend the top cross member before those   
   fail.  I've done both.  The cross pins on both of my 20 ton presses are   
   about 0.780in.  Not much more than 3/4.  3/4 should be fine.   
      
      
      
      
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)