Product range

Rotary Shaft Seals for Reliable Rotating Equipment

Radial lip seals that retain lubricant and keep contamination out of rotating shafts in gearboxes, pumps, motors and mill equipment.

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Fig. — Rotary Shaft Seals · schematic, not to scale

Overview

About Rotary Shaft Seals

Rotary shaft seals — widely known as oil seals or radial lip seals — sit between a rotating shaft and a stationary housing. A flexible sealing lip runs on the shaft surface to retain oil or grease, while the outer diameter seals statically in the housing bore. Many designs add a garter spring to maintain lip contact and a secondary dust lip to keep contamination away from the primary lip.

Sealing Technologies supplies rotary shaft seals in standard profiles and in customized constructions for demanding duty — single and double-lip industrial oil seals, including hydrodynamic wave-lip designs, in Viton™ (FKM), PTFE, NBR and EPDM, with options for high shaft speeds and chemical media. Our sales engineers help match the profile and material to the shaft, the media and the operating conditions of your equipment.

Product range

Rotary Shaft Seals — Profiles and Specifications

Sizes and ratings are confirmed against your application. Where a value is not listed, it is available as per application requirement.

TC Type Rotary Oil Seals

The most widely used rotary seal profile: rubber-covered outside diameter, metal insert, spring-loaded sealing lip and an additional dust lip.

Rubber-covered OD for static sealing in the housing
Spring-loaded primary lip
Secondary dust lip against contamination

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: NBR, FKM, silicone, HNBR — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Gearboxes, pumps, motors and general rotating equipment

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NSE Type Rotary Seals

Rotary seals supplied against the NSE profile designation. Share the profile reference, drawing or sample and our engineers will confirm the matching construction.

Supplied against profile reference, drawing or sample
Material selected for the application

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: As per application requirement
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Confirmed against drawing or sample

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Single-Lip Rotary Seals

A single sealing lip for retaining oil or grease where external contamination is limited.

One primary sealing lip
Compact construction
Available with or without spring

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: NBR, FKM, silicone, HNBR — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Clean environments, grease and oil retention

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Double-Lip Rotary Seals

A primary sealing lip combined with a dust lip, for equipment working in dusty or dirty surroundings.

Primary lip retains lubricant
Dust lip excludes dirt and moisture
Rubber-covered or metal-cased OD

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: NBR, FKM, HNBR — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Dusty and contaminated environments

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Spring-Loaded Rotary Seals

A garter spring maintains contact between the sealing lip and the shaft and helps compensate for lip wear and minor shaft run-out.

Garter spring maintains lip load
Helps compensate for wear and run-out
Spring material selected for the media

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: NBR, FKM, silicone, HNBR — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Oil-lubricated rotating shafts

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PTFE Rotary Seals

A PTFE sealing lip in a metal case for duties where elastomer lips may not be suitable — aggressive media, limited lubrication or high surface speeds.

Low-friction PTFE lip
Broad chemical resistance
Considered for dry or poorly lubricated running

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: PTFE / filled PTFE lip, metal case
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Aggressive media, high speed, limited lubrication

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High-Temperature Rotary Seals

Rotary seals in heat-resistant materials such as FKM, silicone or PTFE for equipment running at elevated temperature.

Heat-resistant elastomers or PTFE
Material matched to media and temperature
Standard and customized profiles

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: FKM, silicone, HNBR or PTFE — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Hot gearboxes, drives and process equipment

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Heavy-Duty Rotary Seals

Robust, reinforced seals for large shafts and severe service in rolling mills, cement plants and mining equipment.

Reinforced construction
Suited to large shaft diameters
Options for heavily contaminated environments

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: NBR, HNBR, FKM — as per application
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Rolling mills, kilns, crushers and heavy drives

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Customized Rotary Seals

Non-standard sizes, special lip arrangements and special materials sourced to your drawing, sample or application.

Sourced to drawing or sample
Non-standard sizes and profiles
Special materials on request

Shaft Diameter: Available as per application requirement.
Housing Diameter: Available as per application requirement.
Width: Available as per application requirement.
Material: As per application requirement
Temperature: Depending on compound, design and application.
Pressure: Depending on compound, design and application.
Speed: Depending on compound, design and application.
Application: Special and non-standard equipment

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Materials

Rotary Seal Materials

The same profile behaves very differently in different compounds. These are the materials most often supplied for rotary seals.

Full materials guide

NBR Nitrile rubber The general-purpose seal elastomer for mineral oils, greases and hydraulic fluids. Details FKM Fluoroelastomer · Viton™ A fluoroelastomer chosen for elevated temperature and for resistance to oils, fuels and many chemicals. Details VMQ Silicone rubber An elastomer with a wide working temperature range and good flexibility at low temperature. Details HNBR Hydrogenated nitrile A hydrogenated nitrile that improves on NBR for heat, ozone and wear resistance. Details PTFE Fluoropolymer A fluoropolymer with very low friction and resistance to almost all industrial chemicals. Details

Other suitable elastomers and materials are available where the application requires them.

Selection

What Material Selection Depends On

There is no single best seal material. The right choice follows from the operating conditions — share these with our engineers and we will recommend a suitable seal.

TemperatureOperating and peak temperature at the sealing lip.
PressureAny pressure acting on the seal, steady or intermittent.
SpeedShaft speed and the resulting surface speed at the lip.
Chemical exposureCleaning agents, process chemicals and additives.
MediaThe oil, grease or fluid to be retained.
Shaft conditionSurface finish, hardness, run-out and wear.
Application environmentDust, water, scale and other contamination.

Questions

Frequently Asked Questions

What information is needed to quote a rotary shaft seal?

Shaft diameter, housing bore diameter and seal width are the starting point. Profile type, material, the medium being sealed, operating temperature, shaft speed and any pressure help our engineers confirm the right seal. A drawing, part number or sample also works.

What does TC mean on an oil seal?

TC is a common profile designation for a rotary shaft seal with a rubber-covered outside diameter, a metal reinforcing insert, a spring-loaded primary sealing lip and an additional dust lip.

Which material should I choose for a rotary seal?

It depends on temperature, media, shaft speed, pressure and the operating environment. NBR is widely used for general mineral-oil and grease duty, while FKM, HNBR, silicone or PTFE are considered when conditions are more demanding. Our engineers can recommend a material for your application.

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Need help selecting a seal from this range?

Share the seal size, a drawing or the operating conditions. Our sales engineers will help identify a suitable sealing solution and send you a quotation.

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