Engine Block Main Bolts & Studs
Main engine block bolts and studs are integral in the structural integrity of the core of an engine. The purpose of using a bolt or stud is to secure the cylinder head to the block which in turn, secures the crankshaft. Most engines that see everyday use in personal vehicles will come equipped with bolts instead of studs. The advantage of using a bolt is that they are easier to install and remove, and they don’t require as much disassembly of the engine to be removed. Studs are used to do the same thing as bolts but they add strength and reliability which makes them highly used in powerful engines. Since studs are not tightened into the block to be secured like a bolt would, they don’t have that added twisting strain. This means that they are more likely to stay tight and prevent leaks or breakages that may be seen when using bolts in high performance applications.
The main engine bolts and studs are made out of extremely strong steel that can withstand all the strain and temperature changes that these are subjected to. The threads on these bolts and studs are usually rolled after heat treatment which makes them have a longer fatigue life than most standard bolts and studs, which are threaded prior to heat-treating. This heat treatment gives them around a 200,000 psi rating which is more than enough for most tasks. Main engine block bolts will usually come with a washer, and studs will come with both a washer and a nut. It is important to use the supplied washers and nuts since these are also build out of superior materials to handle the loads that most other applications that use these wont experience.
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