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A typical rotary shaft seal consists of several key components a flexible sealing lip, a rigid outer casing, and sometimes a spring mechanism to enhance the sealing effect. The sealing lip is made from elastomeric materials, which allow it to maintain flexibility while adapting to the surface of the rotating shaft. The outer casing is usually made from metal or hard plastics, which ensures a secure fit within the housing or bore.

2. Contaminant Protection Grease seals act as a first line of defense against contaminants. Dust, water, and debris can enter the bearing assembly and potentially lead to corrosion, pitting, and other forms of wear. By keeping these contaminants out, grease seals help maintain the integrity of the bearings.

3. Size and Specifications The dimensions of the hydraulic cylinder oil seal play a crucial role in determining price. Custom-sized seals are often more expensive due to the added manufacturing requirements. Standard sizes typically benefit from economies of scale, driving down costs. Additionally, seals designed to meet specific pressure ratings or other performance criteria may incur higher costs due to the need for advanced materials and testing.

The nomenclature 30x42x7 describes the oil seal's three critical dimensions the inner diameter (ID), outer diameter (OD), and width (W). Specifically, this oil seal features an inner diameter of 30 mm, an outer diameter of 42 mm, and a width of 7 mm. These measurements indicate that it is designed to fit into a specific space within a machine, preventing the leakage of fluids, particularly oil, from critical components like shafts and housings.