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its not only in the alloying of the aluminum that counts, its the level of heat-treat, such as 6061 t6, t6 being the heat treat number. There is a large can of worms to be opened if you don't know exactly the material you are working with.

9/32=.28" If your holes in your winch drive measure more than that(measure 2 directions) you will continue to shear pins no matter what you put in. If there is ANY play in the hole in comparison to the pin it will let the pin shift, and the stresses shift from sheer to tinsile strength. The pin...