INDUSTRY COMPONENT

Oil Seal

Oil seal is a critical sealing component that prevents lubricant leakage and contaminant ingress in rotating machinery.

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Component Specifications

Definition
An oil seal, also known as a radial shaft seal, is a mechanical device designed to retain lubricants within a rotating shaft assembly while excluding contaminants such as dirt, dust, and moisture. It consists of a flexible sealing lip made of elastomeric material bonded to a metal casing, creating a static seal with the housing and a dynamic seal with the rotating shaft.
Working Principle
The oil seal operates on the principle of hydrodynamic lubrication and contact sealing. The sealing lip maintains light contact with the rotating shaft, creating a thin lubricant film that reduces friction while preventing leakage. The spring-loaded lip ensures consistent contact pressure, and the sealing edge geometry directs any leaked fluid back toward the lubricant reservoir.
Materials
Primary sealing lip: Nitrile rubber (NBR), Fluorocarbon rubber (FKM/Viton), Silicone rubber (VMQ), Polyacrylate rubber (ACM). Metal casing: Carbon steel with corrosion-resistant coating. Garter spring: Stainless steel (AISI 302/304).
Technical Parameters
  • Lip Design Single lip, double lip, or spring-loaded
  • Shaft Speed Up to 20 m/s
  • Shaft Diameter 10-200 mm
  • Pressure Rating 0-0.5 bar
  • Sealing Direction Unidirectional or bidirectional
  • Operating Temperature -40°C to +200°C
Standards
ISO 6194, DIN 3760, SAE J946

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Oil Seal.

oil seal radial shaft seal breather assembly seal mechanical seal industrial sealing FKM seal NBR seal shaft seal replacement sealing components Oil Seal in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Breather Assembly

A protective device that allows air exchange while preventing moisture and contaminants from entering the conservator tank.

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Engineering Analysis

Risks & Mitigation
  • Lubricant leakage leading to equipment damage
  • Contaminant ingress causing bearing failure
  • Seal hardening/cracking from thermal degradation
  • Improper installation causing immediate failure
FMEA Triads
Trigger: Shaft surface roughness exceeding Ra 0.8 μm
Failure: Accelerated lip wear and leakage
Mitigation: Ensure shaft finish Ra 0.2-0.8 μm, use shaft sleeves if surface is damaged
Trigger: Chemical incompatibility with synthetic lubricants
Failure: Seal swelling, softening, and loss of sealing ability
Mitigation: Verify material compatibility charts, select FKM for synthetic oils

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Housing bore: H8, Shaft: h9, Radial runout: ≤0.1 mm, Axial movement: ≤0.5 mm
Test Method
ISO 6194-1: Leakage test at rated speed and temperature, ASTM D1414: Compression set test, ASTM D2240: Hardness measurement

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes oil seal failure in breather assemblies?

Common causes include improper installation (damaged lip), excessive shaft runout or misalignment, chemical incompatibility with lubricants, overheating beyond material limits, abrasive contamination, and shaft surface imperfections.

How do I select the right oil seal material?

Select based on operating temperature, lubricant type, chemical exposure, and shaft speed. NBR for general purpose, FKM for high temperature/chemical resistance, ACM for transmission fluids, and VMQ for extreme temperatures.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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