The first distinctive element of flywheel bolts is the small space where they must be positioned.
Hence, these fasteners are usually small, compact, and without big heads.
The space limitations impact the design and construction stages and affect flywheel bolts‘ ability to obtain spectacular performances.
Whatever the space available is, flywheel bolts must distribute the highest load possible to guarantee the proper power transmission from the engine to the gearbox.
They are not required to have particular length or rectilinearity characteristics, and they are not subjected to extreme thermal stresses like what happens to cylinder head bolts.
However, they demand a particular amount of experience in their design and production since they are critical bolts enclosed in the analysis of those crucial elements for engine performance.
Flywheel bolts have strength classes and bespoke solutions
To best meet space requirements, in most cases, flywheel bolts have strength classes 10.9 and 12.9, and also customized classes with very narrow Rm ranges.
The trend is starting to also anticipate class 14.9, precisely as what is happening for the con rod bolts, which are also components that have to keep to small dimensions due to their role and the type of stresses to which they are subjected.
Nevertheless, rising in class exposes any bolt to the risk of embrittlement caused by hydrogen.
The flywheel bolts are the most exposed to this phenomenon, so it is necessary to consider this possibility.
From our point of view, this is one more reason to choose Brugola OEB’s know-how, which is very careful to prevent hydrogen-caused embrittlement starting in the bolt production stage.<
When you are looking for flywheel bolts or any other special or fastening component, Brugola OEB is a reliable partner for developing your component.