How to Choose the Right Skeleton Oil Seal Based on Model Number and Shaft Chamber Dimensions?

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When selecting and understanding skeleton oil seal models, it is essential to know how their naming conventions relate to shaft and housing dimensions. The following guide explains how model codes work and how to choose the correct seal for your application.

Model Designation Rules for skeleton oil seals

skeleton oil seal model numbers typically consist of letters, numbers, and symbols. Each element conveys specific information about the seal’s structure, dimensions, and functional features.

Typical Model Format

Example: TC 50 × 80 × 10

T: Indicates the basic seal structure. “T” commonly refers to a seal equipped with a garter spring.

C: Indicates the presence of a dust lip. This is typical of double‑lip designs that prevent external contaminants from entering.

50: Inner diameter (d), matching the shaft diameter (mm).

80: Outer diameter (D), matching the housing bore (mm).

10: Width (W), representing the seal’s thickness or installation depth (mm).

Meaning of Each Dimensional Parameter

Inner Diameter (d): The sealing surface that contacts the shaft. It must match the shaft diameter precisely to ensure proper interference and sealing.

Outer Diameter (D): The external dimension that fits into the housing bore. Proper fit ensures stability and prevents leakage.

Width (W): The seal’s thickness, which affects installation depth and overall sealing performance.

How to Select a Seal Based on Shaft and Housing Dimensions

Correct seal selection requires accurate measurement and proper matching of dimensions. Below are the key steps.

Measure Shaft and Housing Dimensions

Shaft Diameter: Use calipers or other precision tools to measure the shaft accurately.

Housing Bore Diameter: Measure the inner diameter of the housing where the seal will be installed.

Match Inner and Outer Diameters

Inner Diameter Fit: Choose a seal with an inner diameter slightly smaller than the shaft to ensure proper interference and avoid leakage.

Outer Diameter Fit: The seal’s outer diameter must match the housing bore to ensure a secure press‑fit and maintain sealing integrity.

Select the Appropriate Width and Material

Width: Choose a width that fits the available installation space and fully covers the sealing interface between shaft and housing.

Material Selection: Choose based on operating conditions such as temperature, pressure, and medium.

Common materials include:

NBR (Nitrile Rubber): Suitable for general applications.

FKM (Fluorocarbon Rubber): High‑temperature and oil‑resistant; ideal for harsh environments.

Refer to Standards and Manufacturer Guidelines

Industry standards such as DIN 3760 or quality systems like ISO 9001 can be used as references. Always consult the equipment manufacturer’s specifications to ensure the selected seal meets application requirements.

Practical Recommendations from Shanfeng Seals (NQKSF)

Accurate Measurement: Precise shaft and housing measurements are essential. A seal that is too loose may leak; too tight may cause installation issues or premature wear.

Material Compatibility: Select materials based on temperature, pressure, and the working medium.

Choose the Right Lip Design: Options include single‑lip, double‑lip, and dust‑lip designs. Select according to contamination level and sealing requirements.

Proper Installation: Avoid excessive compression or deformation during installation to ensure long service life.

Selecting a skeleton oil seal is a systematic process: accurate measurement is the foundation, matching operating conditions is the key, and proper installation is the guarantee. A well‑chosen seal reduces maintenance costs and improves equipment reliability.