In addition to their versatility, double-ended bolts with nuts in the middle also offer the advantage of easy installation. The nut in the middle allows for quick and secure tightening of the bolts, making them ideal for applications where speed and efficiency are important. This can help save time and labor costs during the assembly process
Figure 2: Typically shaped oil seal and component nomenclature
The main benefits of Nitrile when opting for use as an oil seal includes:
Today, traditional oil seals have to compete with a new variant oil seal, which is used in most modern engines.

Prepare the shaft and prevent damage
When they are subjected to hot & pressured oil, or hot & pressured gas, they will compress. These seals reduce in size and become more compact. Afterward, they store the mechanical energy generated by the heat and pressure, which is why they can maintain a leak-proof mating surface.
Oil seal characteristics
A square rubber gasket is a vital component in various mechanical applications, providing a seal between two surfaces to prevent leakage or contamination. These gaskets are commonly used in machinery, engines, piping systems, and automotive applications.
Cold rolled carbon steel sheet
(JIS* SPCC)
NBR is recommended for the majority of standard applications and is the most commonly used rubber (elastomer) material. This is because of Nitrile's compatibility with most environments as well as its relatively low cost. Generally nitrile is used for disposable non-latex gloves, footwear, automotive transmission belts, synthetic leather, hoses, o-rings, gaskets, oil seals, and more.
Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.