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First off , Don, I'm so relieved that you change the material from this morning's post of 7170 to 4140. I spent a lot of time stumping some big steel companies today asking about 7170. I thought it was some new chryptonite material. With that much carbon in it, it probably would break if you dropped it on the ground. I knew it had to be a typo. Funny how this thread went from 6 chains vs 4 chains to axles. I know most everyone knows this, but it might be helpful to those that don't know about a body bound bolt. One of the reasons most people shear a bolt or break an axle where the bolt goes thru the sprocket tube is because the hole is drilled too big and no matter how tight you get that bolt, eventually the tube will rock back and forth and shear the bolt or break the axle, whichever comes first. A good remedy for that is to get a longer bolt with a longer shoulder. Make sure the shoulder of the bolt is long enough to go all the way thru the axle tube. You may have to shorten the threads on the bolt. (ex. the shoulder of a standard 3/8 bolt is
.370 and the threads are even smaller. The hole should be drilled with a 23/64 drill (.3593) . Reem the hole thru the axle tube & axle at the same time with a .370 reemer. If you don't have one, you'll have to buy one. The hole has to be the same size as the bolt. That is known as a body bound bolt. Because everything is so tight, it won't rock back & forth and wallow out the hole. If the hole is right, you'll have to hammer the bolt thru because it's size on size. Of course if you're running 1" axles, you can't do a repair by going to a bigger bolt. It just weakens the axle more at the hole. If you have the room, 2 body bound bolts per axle is even better. It will also help with hollow axles. Use a jam nut so it won't loosen up. Everything I've said is null & void, if you hit trees, trailers & big rocks.
While we're now on the subject of sprockets, just a reminder that if you're making your own sprocket tubes or buying them, make sure they're not farm sprockets. Get good flame hardened sprockets. Nothing ruins a chain faster than a soft sprocket that's lost it's form. That's all I gotta say about that.
So what do you all think about O-Ring chain?
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