5/16 winch shear pin questions.

[deuceman51]

I have read the threads on the shear pins with the tests etc. I have a winch that the previous owner drilled to 5/16 so the correct 9/32 is out of the question. I can't seem to find the shearing psi rating for 2024-T361 Al to compare it to the GI 44-45,000Psi rating. Does anybody have a online source where I can find out where the 5/16 2024-T361 compares? I tried google, but didn't come up with much. I'm planning on ordering the 5/16 Al to make my own pins, but would like to know just how much difference 1/32 of an inch is going to make on the psi before we grenade a winch.

Thanks in advance.

 

[m16ty]

Here's the best chart I could come up with. It's the one G made when he did his testing. You might consider brass.

 

[O.D. Fever]

You can always make a cut in the pin with a vee tool or a threading tool at the shear point to the original diameter. Or consult the Machinist handbook for sheer strengths of differant materials, the vee cut is the easiest. Joe

 

[O.D. Fever]

It also should be a function of pie.IE 3.14 X Dia. should give you the increased shear.

 

[firefox]

What about putting a sleave in to put it back to the correct size, then use standard issue shear pins? I was wondering if you could get a drive pin that would have the right ID after putting
in place. Of course I might be crazy and this is really a bad idea. Don't be afraid to say so
if that is what you think. I have a pretty thick skin.
Bruce

 

[O.D. Fever]

Ok , I ran the numbers, at 9/32" and 45000psi increase dia of same matteral to 5/16. .28125 to .312 dia, your new shear is at 49920 psi, you should be well within the military limits, they half rate everything as a rule, you are at plus 10%. You should be good to go. Joe

 

[O.D. Fever]

You just got 10% more hair on your winches reel...lol..

 

[spicergear]

 

[joshs1ofakindxj]

matweb.com is a good source for material properties. They have generic materials and brand names. Just start typing things into the search at the top right of the matweb page.

 

[deuceman51]

LOL, yeah I think that is within reason. Putting a sleave into it isn't really a very practical option for this setup. Works great on seals and things like that, but I don't think it would last in the yoke. I also have a powerline company customer who their guys drilled out the winches so they could put 5/16 bolts in there. I told them that was a bad idea and they grenaded one winch with a grade 8 bolt, go figure! I'm trying to get them back to at least using AL shear pins which I think as O.D. Fever said should be well within reason. I know it's not the same as the 9/32 pins, but I don't know that they have a lot of choice here either. I told them I could get the 5/16 pins made, but I won't warrenty anything in case their winch goes. At least its better than a bolt in there. These guys use their trucks pretty hard, so I can't think of a better test bed to see how 5/16 Al shear pins will work out. I also got them a snatch block, but i'm not sure if they will use it. Looks like we are going to go ahead and test it out.

 

[rickf]

Using the snatch block will depend on if they are just starting the day or if they are close to quitting time.

Rick

 

[deuceman51]

The way these guys beat their stuff up it also depends on the night before, lol.