COMBI Rotary Shaft Seal 30x44x14 NBR GRN®

Applications

The COMBI Rotary Shaft Seal 30x44x14 NBR GRN® is designed for sealing rotating shafts in machinery operating in environments exposed to dust, moisture, and abrasive contaminants. This seal combines a primary radial oil sealing lip with an integrated dirt-exclusion lip, providing dual protection to both retain lubricant inside the housing and prevent ingress of external particles.
Typical applications include industrial gearboxes, agricultural equipment, construction machinery, power transmission systems, mobile hydraulics, and drive shafts where stable sealing performance is required under variable loads and mixed operating conditions.

Advantages

The integrated COMBI sealing system helps reduce shaft wear and extends service intervals by offering controlled lip contact and improved contamination resistance. NBR (Nitrile Butadiene Rubber) provides reliable compatibility with standard lubricating oils, hydraulic fluids, and grease-based lubrication systems.
The design supports consistent performance in rotating assemblies subject to thermal cycling, vibration, and mechanical stress. This seal is suited for OEM production, field servicing, and maintenance programs that require a dependable and cost-effective sealing solution.

Technical Data

Type: COMBI rotary shaft seal
Material: NBR (Nitrile Butadiene Rubber)
Dimensions: 30x44x14 mm
Typical operating temperature range: approx. -30°C to +100°C (depending on medium and system load)
Function: Protection of rotating shafts against lubricant leakage and external contaminant ingress

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Main Description

The COMBI Rotary Shaft Seal 30x44x14 NBR GRN® is a multifunctional sealing component used in rotating systems where both fluid retention and external contamination control are necessary. Its dual-lip configuration offers a reliable sealing interface for lubricated shaft surfaces while preventing dust, dirt, and moisture from entering the system. Unlike standard single-lip seals, the COMBI structure enhances sealing integrity along the shaft contact surface and supports longer equipment uptime.
NBR, the elastomer used in this seal, is well-recognized for its stability in hydraulic and gearbox lubrication environments. It maintains elastic properties and sealing pressure under typical mechanical and thermal working conditions found in industrial and agricultural machinery. The polymer formulation resists oil swelling and degradation, allowing predictable performance across standard maintenance intervals.
This seal is commonly deployed in machinery that operates in open or semi-exposed environments, where contamination levels are high and service downtime is costly. The integrated dust lip helps extend bearing life, prevent lubricant loss, and stabilize drive system operation. The seal is suitable for use in preventive maintenance schedules, OEM manufacturing, spare part stock planning, and quick repair service operations.

FAQ

Is NBR suitable for use with standard lubricating oils?
Yes. NBR provides stable performance in contact with mineral oils, grease lubrication systems, and common hydraulic fluids.

Can this seal be used in dusty and wet environments?
Yes. The COMBI design includes a secondary lip to block contaminants and moisture.

Does this seal reduce shaft wear?
Yes. The combined sealing geometry distributes contact load and helps minimize shaft scoring over time.

Is special installation equipment required?
Standard seal installation procedures apply; using proper tooling helps prevent lip damage during assembly.