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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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