These bolts are used to attach the flywheel to the crankshaft. I have a 74 Jeep CJ 5 that I am rebuilding and have decided to replace the factory flywheel bolts after removing the flywheel for grinding. The final torque specification is 100-110 ft-lbs, which is achieved by tightening the sample over three incremental passes. The heads of these bolts only accept about 70 ft-lb of torque before they begin to fail due to rounding. The screw heads are very thin to begin with, so there are actually very few screw heads in the socket and they are made of some sort of "hardened alloy". Wrong type I might add. I used a hex head, which provides the most contact with the bolt head and has the least chance of rounding the bolt head. These are half inch screws and should be strong enough for the recommended torque. You are not. I reused the original all-steel bolts at 105 ft-lbs of torque with no problems. The weight of these bolts compared to the originals shows that they are not nearly as strong. This will be my first and probably last experience with Mr Gasket products. Half-inch flywheel bolts are hard to come by these days, but you can always buy eight half-inch bolts of the length you want and grind the bolt heads to match the stocks if clearance requires it. I should also add that these bolts are too long, about a quarter inch or more, and after passing through the flywheel, had maybe a thousandth or two of clearance to touch the engine block. I would have to sand about an eighth of an inch length for them to work. They are incorrectly listed as suitable for my 4.2 liter inline 6 engine. Do not buy for this app.
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