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:ditto:

Hooty, its all right, you have a valid Q.; I wish I had the A. to that.... I mean accurate alloy specs of the brass rod I used. No chance, so far...:( I could send you a sample if you want to have it tested it in a lab? Yes, I know that chart can be kind of confusing since I put all materials...

Total length is 2-3/8", c-c distance between holes is 2-3/16", hole diam. = 2mm. G.

Good point Chuck! I really didn't think about rocking the long lever back and forth x-times before applying ultimate torque to the point of shear... :) But.... do we really see any significant torque in the opposite (reverse) direction, despite the force to overcome the band-brake??? And if so...

If you mean shear strength.... I used to think the same until I did the testing: The final torque value to breakage was about the same for a given material; pin fitted tightly into a cylindrical hole vs. same pin in an oversized, deformed hole. Maybe its comparable to cut (shear) material with a...

Good Q., wish I knew the exact specs...! :? Store doesn't know..., hopefully their supplier does.... will try to find out anyways and let you all know! G.

....for the AL pins it would be about 25,000lbs, first layer on the drum, single line.......!:shock:

Yes, but only if the shaft hole was already enlarged. Average shear strength was about 10% over stock AL pins for 5/16" brass pins. Turning them down to 7.4 - 7.5mm diam. would bring it very close to what the military had. G.

Well, finally.... did some more testing, including all kind of materials combining different hole and pin diameters...... and found at least some that could be considered good alternatives to the original genuine GI spec aluminum shear pins! A VERY BIG THANK YOU to Kenny (Recovry4x4) for...

Yes for the brass bolts (5/16" diam.)! Not sure if I can find them in AL here. G.

So would you send me a pair to run them against Kenny's? :-D Then we can go: ".... and the winner is: ......" :roll: G.

:-D OK, you have convinced me! Lets see what they can "pull"! PM sent! TIA

Good Q.! .... But how "bad" must they be .....!?:roll: Lets asume they give up at one half, no - one quarter! of the desired strenght (or what a "safe and sound" shear pin could do): that bad guy still would be able to produce way over 1ton of tension in the rope in its upper layer, more than...

Really appreciate your offer Kenny! If those are good ol' OEM pins I would hate to crack even one in pieces, just for testing purposes, even if it was "for the cause"... Let them live and die in real "battle"... :smile: Can't we get known and proven "aftermarket" ones from one of our vendors...

Not that handy....:smile: Had to do some measuring & testing first, with real size parts and “sacrificing” half a dozen of my pins to determine their actual strenght... Found following: 1)Most of the (rebuilt) winches I checked have the hole in the input shaft already re-drilled to...

:ditto:

That's correct. I measured some OEM at 7.10mm = .28", which is very close. G.

For do-it-yourselfers or the ones who can't buy them so cheap or aren't so close by.... I just did some comparative testing with my own creation of a "shear-pin cracker" (pat.pend. :smile:) which actually worked better than expected....... The OEM pins (including the broken core of my very 1st...

What we really needed to compare is its shear strength. I would take a ¾” bolt with its nut on, drill a 9/32” hole through both, clean and lube, stick the pin in, hold the bolt head in a vice, turn the nut with a torque wrench and read how much it takes to shear each sample. This isn’t...