Rotary shaft seal 14x21x3 VC ZBA NBR - single lip oil seal

Application in rotary sealing systems

ZBA design - single lip without spring

NBR material and technical parameters

Main description

The 14x21x3 ZBA NBR rotary shaft seal is a compact shaft seal designed for standard rotary sealing applications in industrial and automotive equipment. It is a single lip oil seal made of NBR (nitrile-butadiene rubber), featuring a ZBA design without a spring and an elastomer outer jacket. This construction ensures reliable sealing performance in applications with limited installation space and stable operating conditions.

The NBR compound provides good resistance to oils and greases, making this rotary shaft seal suitable for common lubricants used in industrial machinery. The 14x21x3 ZBA seal is widely applied as a machine shaft seal in small gear units, auxiliary drives, pumps, and mechanical assemblies where effective rotary sealing is required without the need for additional dust protection.

Compared to a double lip oil seal, the ZBA single lip version offers a simplified structure and easier installation. The absence of a spring reduces assembly time and minimizes the risk of damage during mounting, which is especially important in series production and maintenance operations. Despite its simple design, the seal delivers high durability when operated within recommended parameters.

The 14x21x3 ZBA NBR oil seal is intended for B2B customers seeking a cost-effective and repeatable technical sealing solution for standard industrial applications. It can be used both in new equipment and as a replacement seal during servicing and repairs.

FAQ - frequently asked questions

What is the difference between a single lip and a double lip oil seal?
A single lip oil seal provides basic oil sealing, while a double lip seal additionally protects against external contamination.

What material is used in the 14x21x3 ZBA seal?
The seal is manufactured from NBR, offering good resistance to oils and greases.

Does the lack of a spring affect sealing performance?
No, under normal operating conditions the ZBA design ensures stable and effective sealing.

Where is this rotary shaft seal typically used?
In industrial machines, small gearboxes, auxiliary drives, and mechanical assemblies.

How do I select the correct shaft seal size?
Match the inner diameter to the shaft, the outer diameter to the housing, and the width to the available installation space.