black perforated metal screen

(6) Note that there should be a certain amount of lubricating oil on the lip of the oil seal.

Table 1: The functions of the various components

Lubricants applied between moving and stationary elements of mechanical equipment help to prevent damage. But when the equipment are under high pressure, the lubricants tend to escape, hence the need for oil seals to prevent the clashing of dry parts. Practically all mechanical equipment, including car engines, assembly machines, and PTFE machined parts use these oil seals to prevent harmful interaction that can result in damaged parts.

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Note: For seal type codes, see Table 2.

A

To act as a barrier and prevent dirt, contamination and other external entities from entering the system containing the lubricating oil.

Figure 5: Shaft surface with and without lead marks