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 - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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