CORTECO 12018654 Rotary Shaft Seal 85x105x12/18 FPM/ACM (RWDR-KASSETTE RS)

Applications

The CORTECO 12018654 rotary shaft seal in size 85x105x12/18 (RWDR-KASSETTE RS, left-hand thread) is designed for heavy-duty rotational sealing in drivetrain and transmission systems. It is commonly used in SCANIA vehicle applications, including differential housings and gearbox output shafts. This seal prevents oil leakage while protecting internal components—such as bearings and gear assemblies—from dust, dirt, moisture, and abrasive contamination. It corresponds to OEM numbers: SCANIA 1300974, 1380160, 1393331, 1502384.

Advantages

Manufactured from a composite of FPM (fluoroelastomer) and ACM (polyacrylate), this seal offers strong resistance to synthetic oils, high-temperature operation, and oxidative aging. The cassette design ensures controlled shaft guidance, extended seal lip life, and reduced surface wear. The left-hand spiral thread actively returns lubricant toward the sealing zone, improving dynamic sealing efficiency at varying shaft speeds and load conditions. This ensures stable performance, higher durability, and extended service intervals in demanding industrial and transportation environments.

Technical Data

Dimensions: 85x105x12/18 mm
Material: FPM / ACM
Design: RWDR-KASSETTE RS, left-hand thread
OEM Reference: SCANIA 1300974, 1380160, 1393331, 1502384
Application Type: Differential and gearbox shaft sealing

Main Description

The CORTECO 12018654 rotary shaft seal is engineered to maintain reliable lubrication and protect rotating drivetrain components in SCANIA heavy-duty vehicle systems. The cassette construction integrates multiple sealing and protection features into a single assembly, providing both internal lubrication retention and external contamination control. This is essential in vehicles exposed to high torque loads, long-duty operation cycles, and variable environmental conditions.
The combination of FPM and ACM elastomers ensures long-lasting sealing performance. FPM provides strong resistance to transmission oils, high temperatures, and chemical breakdown, while ACM enhances endurance under continuous mechanical stress and thermal cycling. The RWDR-KASSETTE RS configuration provides stable lip geometry and reduced friction, promoting long seal life and protecting adjacent components, including bearings and shaft surfaces.
The left-hand directional thread built into the sealing lip actively returns oil toward the lubrication zone during shaft rotation, improving dynamic sealing compared to standard smooth-lip seals. This minimizes leakage, reduces wear, and helps stabilize operating temperature in high-load transmission systems.
This seal is recommended for fleet service, OEM replacement, transmission overhaul operations, and maintenance programs focused on reliability and reduced downtime.

FAQ

Is this seal compatible with SCANIA gearboxes and differentials?
Yes. It corresponds to OEM references 1300974, 1380160, 1393331, and 1502384.

What is the purpose of the left-hand thread design?
It actively redirects oil back toward the lubrication zone, improving sealing performance under dynamic rotation.

Why use FPM/ACM instead of NBR?
FPM/ACM offers superior chemical, thermal, and wear resistance for heavy-duty and high-temperature applications.

Does this seal help protect bearing assemblies?
Yes. Proper sealing prevents contamination and ensures stable lubrication, extending bearing and shaft life.