Another important aspect of bolt structure is the threading. The threading of a bolt refers to the grooves that wrap around the shank of the bolt. The threads on a bolt are what allow it to be screwed into a nut or a threaded hole in a material. The pitch, or distance between each thread, can vary depending on the application of the bolt. Coarse threads are better suited for applications where quick assembly is required, while fine threads are used for applications that require higher strength and precision
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- Valve oil seals are typically made from a high-quality rubber or silicone material that is resistant to oil and high temperatures. They are designed to fit snugly around the valve stem and create a tight seal that prevents oil from leaking past the valve guide into the combustion chamber. This helps to ensure that the engine runs smoothly and efficiently.
The seal is usually made of high-quality materials such as rubber or synthetic compounds that can withstand high temperatures and pressures. It is designed to maintain a tight seal even under extreme conditions, such as rapid changes in temperature and pressure during engine operation.
What are Oil Seals and how should they be ordered?
The construction of an oil seal is a testament to meticulous engineering. Each oil seal primarily comprises two core components: the sealing element and the metal case. The collaboration of these parts brings about the seal’s functionality and effectiveness. A garter spring may also be included as an available feature, providing an extra layer of operational support.
The garter spring is located at the end of the primary sealing lip and used to apply pressure to the sealing lip against the shaft. Common garter spring material types are:
Rotary Wheel Of Auto Parts

These types are made with a metal outer case and a PTFE lip. They are suitable for a wide range of temperatures from -90 °C to +260 °C.These lip seals can also be used for higher pressures of up to 10 bar (special types up to 25 bar) and rotational speeds of up to 40-45 m/s. Certain grades of PTFE are suitable for use in pharmaceutical and food applications. One important point is that PTFE lip seals do require a shaft with a harder, smoother finish.
The most common and economical material within the sealing industry, Nitrile, is used in many oil applications, the automotive sector for aircraft fuel applications, military and marine applications, and more.
Update: Leakage-free
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