That's a question I have never thought about. What I do know is most all implements from the 40's and before had square heads, and the ones from the later fifties tended to incorporate both. Both my 44H series had square. Maybe someone with a 444 plow could tell us if it had square or hex. I would think Hex heads had to wait for grade 3 steel hardware to be affordable, or torque pressures to be greater than the softer bolts could stand. Dad bought a new 1948 Cat D6 which was all hex grade 3 or better. I remember old Johnny saying, "that's a Caterpillar bolt. Put that in there, it'll stay" The square ones were of softer steel, easily rounded off with an ill-fitting wrench, so hex heads of this steel would have been Really easily rounded off. They probably did it gradually, not with a boom. If I were a family farmer back then with a toolbox full of square-ended wrenches and went to buy a plow (or anything else) and found out I would have to buy a whole new set of those "new-fangled" "six-sided" wrenches along with it, then I might choose not to. Remember, all the tractor companies were still coaxing farmers into retiring their mules in 1950. Ever seen a Monkey Wrench? Ever try to turn a hex with one?
The real boom in ag machinery can about be time-lined to about 1960, when the WWII vets came to maturity. Their fathers (my grandfather)farmed during the Depression and still held the purse-strings of most farms until they started reaching retirement age during the late 50's-early 60's. They remembered the Hoover Days all to clearly and were none-too-eager to spend money unnecessarily. The 1950's was a transition period where mule-driven technology and its malleable iron slowly gave way to horsepower and cold steel.
So... after a whole lot of rambling... I don't have a clue.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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