I have seen shear pins/bolts for industrial applications that had the diameter reduced or turned down at the shear point to make the shear torque more consistent. I have never seen one like this in an agricultural application. If tthe shear pin holes get worn or distorted from having been shorn many times it will make the pin shear at lower torque than expected, Sometimes the pin holes are in bushings that can be replaced for that reason.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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