ZF 634303663 – O-Ring for ZF Marine Transmissions (NBR/FKM, Ø50×40×5 mm)

ID 1233037

1-2 weeks delivery time

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The ZF 634303663 O-Ring is a marine-grade NBR/FKM seal for ZF transmissions, rated for 15 bar and temperatures −40°C to +120°C. With a 50×40×5 mm profile and 70 Shore A hardness, it provides abrasion-resistant, leak-proof sealing in gearboxes and pumps for ZF 63A, ZF 220, ZF 280 and similar systems.

Description
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ZF 634303663 – O-Ring for ZF Marine Transmissions (Ø50×40×5 mm)

The ZF 634303663 O-Ring is a precision sealing element engineered for ZF marine transmission systems operating in demanding marine environments. Manufactured from durable elastomers such as NBR or FKM, it provides reliable, long-lasting sealing against fluid loss in gearboxes, pumps, and hydraulic interfaces. Designed to withstand saltwater exposure, pressure up to 15 bar, and temperatures from −40°C to +120°C, this O-ring ensures stable performance for both recreational and commercial vessels.

Key Features:

Marine-grade elastomer (NBR or FKM) for long-lasting sealing performance
Corrosion and saltwater resistant for harsh marine environments
Temperature capability from −40°C to +120°C
Pressure resistance up to 15 bar for transmission and hydraulic circuits
70 Shore A hardness for secure, stable sealing under dynamic loads
Abrasion-resistant material for extended service life
Compatible with multiple ZF marine transmission models

Specifications:

Part Number	ZF 634303663
Material	NBR or FKM
Outer Diameter	50 mm
Inner Diameter	40 mm
Cross Section	5 mm
Temperature Range	−40°C to +120°C
Pressure Resistance	Up to 15 bar
Hardness	70 Shore A
Compression Set	≤ 10% at 100°C / 22 h
Operating Speed	Up to 5 m/s
Color	Black
Cycle Life	Over 500,000 cycles
Compatibility	ZF 63A, ZF 220, ZF 280 and related marine transmissions

Compatibility and Application:

The ZF 634303663 O-Ring is used in sealing interfaces of ZF 63A, ZF 220, ZF 280 and similar marine transmission systems. It is suitable for gearbox housings, pumps, engine-driven hydraulic circuits, and other components where fluid retention and pressure stability are critical. Its marine-grade elastomer formulation ensures reliable operation even under constant vibration, thermal cycling, and saltwater exposure.

Benefits:

Leak-proof sealing improves transmission efficiency and reduces fluid loss
Withstands pressure and thermal variations typical in marine propulsion systems
Abrasion-resistant formulation extends service intervals
Low maintenance requirement reduces overall operational costs
Compatible with multiple ZF models for broad application coverage
Ideal for both commercial and recreational marine applications