The basic principle of sealing is straightforward – the flexible lip is held against the rotating part (usually the shaft) whilst the casing (or O.D.) is pressed into the housing or bore and holds the seal in place. The sealing lip needs some form of lubrication to avoid overheating and is usually energized by means of a garter spring.
Various materials with unique properties are utilised in the construction of rotary shaft seals, allowing manufacturers to tailor the sealing solution to specific industry requirements and ensure optimal performance.
Standard springs are made of carbon steel. We use stainless-steel springs for our GR and GRST oil seals made from FKM rubber. In some rare cases, an O-ring is even used as a spring element. Standard PTFE lip seals are not fitted with springs.
Figure 6: Oil seals for cars

Sealing lip
MH: O.D. wall is a rubber material
HM: O.D. wall is a metal case
MH(S)H: O.D. wall is metal with a reinforced inner metal case
We have different types of oil seals that are designed specifically for various industries, like aerospace, automotive, oil & gas, electronics, chemical analysis, food & beverage, engineering, and so on. Some of our other custom products are bellows, insulators, labware, bushings, ball valve seats, tubes, rods, films, and sheets. Contact us today to make sure you choose the best component for your application.


What Is an Oil Seal, and What Are Its Elements?
There are a wide range of oil seals to select from for any number of uses, so this guide will break down the most common seals to help you choose the right one for whatever piece of machinery you are working on.