This thread is meant for Ray54 and those that pull implements with their favorite brand of tractor:
I see many Caterpillar and Allis Chalmers with clobbered out, egg shaped, worn out drawbar eyes; however, no matter how hard the International Harvester units were used, they seem to maintain a round hole...
Did IH use an electro hardening process to make the drawbars better than the others?
Something to ponder... JM

Most Red machines would not last enough to elongate the drawbar pin hole!! 

I have welded several drawbars on our IHC tractors to fill in the elongated hole.   Same with the green machines also. 

In older tractors they were usually common HR steel with some CR including IHC. 

I was expecting that response. Hahaha. We owned a well used 544 wheel tractor here, that I estimate had over 6000 hours on in, much of it spent pulling a model 55 wheel disk; hole was hardly elongated, and we were too poor to use the proper sized hitch pin.
I am hoping an IH fanatic will chime in. as well. JM

If all there was to farm with was a TD14 or TD18 I would just take my social security check and quit!! I put a lot of time on a AC. HD7 as a kid and it was no sweetheart to drive but it beat having to sit on an a TD18. I had a Farmall M and a Farmall H for years and never had much trouble but you sure could not say that about there Tracklayers!!

Well, 17AFarmer, I get that. There are certain tractors more fun, more comfy and more power to operate here than others. I often talk about my days of slaving away on a large rice farm for minimum wage operating a D7E High Horse. No umbrella and it boiled my cooler of ice water. All the sun I wanted to fry my brain.
Never ran any IH larger than my TD9B here. Never cared for the older model 6 or 9s that you had transmission shifter between legs and steering levers banging on my kneecaps.
Maybe I can start a new thread, "Show us your worn out drawbar eyes" LOL. Seriously, I see too many IH that are pristine; and I am aware they are high hour drawbar tractors, not just for dozer work. JM

For Juiceman 

I had never given this much thought, but I would agree most gas start IH diesel crawlers never got enough hours to wear a drawbar.

No I believe I have seen some IH crawlers with warn drawbars. A lot depends on soil type, more sand more wear on everything.

I convert worn out drawbars to pintle hitch. Allows rotational movement that pins don't provide.
 

I see some of those too, Angelo. Some uglier ones out there; at least that one you can heat it up and squish it in a press. JM

Never noticed IH drawbars much but for sure we don't see Fordson crawlers with worn tracks here in Aus and pretty sure I know why. WF