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I didn't know exactly what the alloy was, but based on the shearing information provided earlier, I looked in Machinery's Handbook, and selected the kpsi rating of a common aluminum alloy that seemed to fit the observed results: 2024T361 shears at 42 kpsi. 2017T4 shears at 38 kpsi, which is a...

You lost me here. Are you implying that because brass contains zinc, and Grade 8 bolts are sometimes zinc plated that zinc is some kind of strong wonder metal that breaks winches? The aluminum alloy that the milspec pins are made from (2024-T361) contains 93.5% aluminum, 4.4% copper, 0.6%...

Every time the PTO is unloaded (clutch in, neutral, whatever...), the entire drive chain relaxes. A loose pin will seek a neutral relaxed position in its hole. When the PTO again takes a load, the pin will move freely in the wallowed out hole, building up inertia, until it gets hammered when...

Hi Gringeltaube, I have no doubt that the pin's shear strength in a carefully controlled one time experiment is nearly the same... But, I think you will find that shear pin longevity drops drastically with a wallowed out hole. The lost motion caused by the wallowed out hole lets the pin go...

The quickest killer of shear pins is allowing the winch or load to jerk. Slow and steady are the rule with winches. No quickly winding up the cable and letting it snap tight, or dumping the clutch... Slow and steady. Also, if a truck is buried in the wheel trenches it dug, a straight pull is...