Oil Seal: Shaft Diameter 10-200 mm, Pressure Rating 0-0.5 bar

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 6194, DIN 3760, SAE J946

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Oil Seal

Manufacturer profiles associated with Oil Seal.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Oil Seal