Skeleton Oil Seal Rotta Shaft Seal for Industrial Machinery & Car Equipment

Skeleton oil seals are essential components in industrial machinery,
automotive systems, and hydraulic equipment. Selecting the correct oil seal
ensures the longevity and efficiency of your machinery. This guide explains
the key aspects of skeleton oil seal model numbering and the selection
process based on shaft and housing dimensions.

What is a Skeleton Oil Seal?

A skeleton oil seal is a mechanical seal designed to prevent the leakage of
lubricants or fluids along the shaft. The seal is made of rubber and a metal
skeleton that provides structural support. Skeleton oil seals are critical
in environments where reliability and performance are essential.

Understanding Skeleton Oil Seal Model Numbers

Skeleton oil seals follow a standardized model numbering system that reveals
a lot about the seal's design, size, and functionality. Typically, the model
number structure includes the seal type, dimensions, and material.

Components of Skeleton Oil Seal Model Numbers

The model number is divided into three main sections:

Seal Type (Letter Codes)

The first part of the model represents the seal type, which defines the
specific design features and applications.

Common types include:

TG4: Enhanced skeleton design for high-load, high-temperature environments.
Ideal for systems subjected to extreme conditions.

TG: Similar to TG4 but with a slightly lower resistance to extreme
temperature and pressure. Suited for standard machinery.

TB: Provides enhanced dust resistance, often used in dusty environments like
construction sites.

SC: Single-lip oil seal, suitable for clean, dust-free environments.

SB: Metal outer shell with high precision, designed for precise applications
requiring excellent positioning.

Dimensions (Numerical Codes)

The numerical portion of the model number specifies the seal's inner
diameter (d), outer diameter (D), and height (H). These dimensions are key
for fitting the oil seal correctly onto the shaft and housing.

For example, TG4 50×80×12:

TG4: Seal type (enhanced design for high-load environments).

50: Inner diameter (d): The seal fits a shaft with a diameter of 50mm.

80: Outer diameter (D): The seal fits a housing with an inner diameter of
80mm.

12: Height (H): The thickness or depth of the seal (12mm).

Material

The material used in the seal affects its resistance to temperature,
chemicals, and wear. Common materials include:

Nitrile Rubber (NBR): Standard material for general oil seals. Temperature
range: -40°C to 125°C.

Fluorocarbon Rubber (FKM): Ideal for high temperatures and chemically
aggressive environments. Temperature range: -20°C to 250°C.

Hydrogenated Nitrile Rubber (HNBR): Suitable for high-temperature and high-
pressure environments. Temperature range: -50°C to 150°C.

How to Select the Right Skeleton Oil Seal Based on Shaft and Housing
Dimensions

Correct oil seal selection involves more than just knowing the model number.
The shaft diameter, housing dimensions, and working environment all play
crucial roles in the selection process.

Step 1: Measure Shaft and Housing Dimensions

Accurate measurements are vital for selecting the right oil seal:

Shaft Diameter (d): Measure the diameter of the shaft where the seal will
sit. The oil seal's inner diameter should be slightly smaller than the shaft
diameter to ensure a snug fit.

Housing Diameter (D): Measure the inner diameter of the housing where the
oil seal will be installed. The outer diameter of the oil seal should be
slightly larger than the housing diameter for a secure fit.

Housing Depth (H): Measure the depth of the housing to ensure the oil seal
fits comfortably and can perform its sealing function properly.

Step 2: Select the Right Material

Choose the material based on the operational environment:

NBR (Nitrile Rubber): Works well in standard environments where temperatures
are relatively moderate and the seal is exposed to oils and fats.

FKM (Fluorocarbon): Ideal for high temperatures and environments with harsh
chemicals.

HNBR (Hydrogenated Nitrile): Best for environments requiring high
temperature and high-pressure resistance.

Step 3: Choose the Correct Seal Type

Choose the right seal type based on your specific needs:

TG4 Type: This type is highly suited for high-temperature and high-pressure
environments, such as those found in automotive engines, heavy machinery,
and hydraulic systems. It’s built for extreme load applications.

TG Type: A more general-purpose seal, ideal for standard industrial
environments. It is suitable for machinery where extreme temperature and
pressure are not a concern.

TB Type: If your environment involves dusty conditions, such as construction
sites or mining operations, the TB Type oil seal provides superior
protection against dirt and debris.

Key Considerations When Selecting Skeleton Oil Seals

Working Conditions

Before selecting a skeleton oil seal, assess the environmental factors:

Temperature: If the oil seal is going to be exposed to extreme temperatures,
consider using Fluorocarbon (FKM) or Hydrogenated Nitrile (HNBR) seals.

Pressure: For high-pressure applications, TA Type oil seals or TG4 Type
seals are designed to withstand such stresses.

Contaminants: If your application involves dust or debris, select oil seals
like the TB Type or TCV Type for added protection.

Installation Requirements

Ensure proper fitment of the oil seal:

The inner diameter of the seal must be slightly smaller than the shaft
diameter for a tight fit.

The outer diameter must match the housing diameter to avoid leakage.

Maintenance Costs

Durable oil seals, such as TG4 or FKM seals, reduce maintenance costs by
offering longer service life and greater reliability. While the initial
investment may be higher, they ultimately reduce the frequency of
replacements and the downtime required for repairs.

Selecting the right skeleton oil seal is crucial for machinery efficiency
and longevity. If you need further assistance or have specific application
requirements, feel free to reach out, and we can provide personalized
recommendations.

Minimum Order: 1000 pieces

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