From: none@none.com99   
      
   On 1/18/2026 1:27 PM, Snag wrote:   
   > On 1/18/2026 11:08 AM, Bob La Londe wrote:   
   >> 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.   
   >>   
   >   
   >     The rods I'm talking about go from the top cross member of the frame   
   > to the cross member that the top of the jack pushes on . The plate/"ram"   
   > the jack sits on slides on those rods . I'm going to order that 4140 , 6   
   > feet for 63 bucks delivered . Shipping costs as much as the material !   
      
   60 bucks and free shipping from MSC, but the price & the free shipping   
   might just be for my commercial account.   
      
   https://www.mscdirect.com/browse/tn?searchterm=4140+steel+round+   
   ods&refinements=Overall+Diameter%3A0.750--Length+%28Inch%29%3A72   
   sortby=price&viewType=list   
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)