SPI SEALS AND LIP RINGS IN ALL SIZES

SPI Seals and Agricultural Lip Seals: All Sizes

SPI seals, also known aslip seals, lip rings, sealing rings, or radial shaft seals, are used to provide a seal between a rotating shaft and its housing.

They are found in a wide variety of agricultural and mechanical equipment: tractors, harvesters, haymaking equipment, tillage implements, transmissions, engines, gearboxes, and bearing assemblies.

Camagris offers an exceptionally wide range oflip seals in several hundred sizes, allowing you to search for a seal directly based on its dimensions.

How do you read the dimensions of an SPI seal?

The dimensions of a lip seal are generally specified as:

inner diameter × outer diameter × thickness

For example:

45 × 75 × 10 mm

corresponds to a ring with:

• an inner diameter of 45 mm, which generally corresponds to the shaft diameter;
• 75 mm outer diameter, corresponding to the diameter of the housing;
• 10 mm in thickness or width.

This designation allows you to quickly find anSPI seal by dimension, even when the original part number is no longer known.

In this category, use theinner diameter, outer diameter, and thicknessfilters directly to identify the dimensions you’re looking for.

What is a lip seal used for?

The primary function of aradial lip sealis to provide a seal for a rotating shaft.

Depending on its installation and design, it helps retain lubricants such as oil or grease inside a mechanical assembly and limits the ingress of dust, moisture, or other contaminants from the outside.

Lip seals are therefore frequently used withbearings, drive shafts, and rotating mechanical components.

They are found, in particular, on:

tractor gearboxes and transmissions, front and rear axles, reduction gears, power take-off (PTO) shafts, hubs, engines, pumps, drive shafts, and numerous components of agricultural machinery.

SPI seal, lip seal, or lip ring: what’s the difference?

In everyday mechanical terminology, the terms“SPI seal,” “lip seal,” and“lip ring”are very often used to refer to the same family of products.

Other terms include:

sealing ring,rotating shaft seal,radial seal,shaft seal,rotating lip seal, oroil seal.

This variety of terms explains why the same size can be searched for under several different names.

How to Choose Your SPI Seal?

When the seal part number is known, it is naturally best to search for that specific part number directly.

Otherwise, the simplest method is to precisely determine the seal’s three dimensions:

shaft diameter × housing diameter × seal width.

The old seal can be measured using a vernier caliper. If it is heavily worn or deformed, it is best to also measure the shaft and its housing directly.

Caution: Two seals with exactly the same dimensions are not necessarily interchangeable in all applications.

It may also be necessary to check the lip material, the presence of a dust lip (if any), the mounting type, as well as the constraints regarding temperature, rotational speed, pressure, and lubricant.

Single-lip or double-lip SPI seal

Depending on the application, a seal ring may include aprimary sealing lipand, in some cases, anauxiliary lip, often intended to enhance protection against dust and contaminants.

For agricultural machinery operating in dusty, muddy, or humid environments, the seal’s design can be particularly important.

It is therefore important to verify the specifications of the selected part number when the installation requires a specific type of seal.

SPI Seals for Tractors and Agricultural Machinery

The operating conditions for agricultural equipment are often particularly demanding: dust, dirt, moisture, mud, temperature fluctuations, and long operating periods.

A defective lip seal can causeoil or grease to leak, lead to bearing contamination, or gradually cause wear on a shaft or mechanism.

When replacing a bearing, it is therefore recommended to also inspect the condition of nearbySPI seals, sealing rings, and shaft seats.

Camagris also offers a wide selection ofball bearings, tapered roller bearings, support bearings, UCF bearings, UCP bearings, and wear ringsto complete the repair of a mechanical assembly.

Find an SPI seal by dimensions

With several hundred part numbers available, this category lets you searchfor alip seal directly by dimensions.

Enter the following in order:

the inner diameter, thenthe outer diameter, thenthe thickness.

This will allow you to quickly identify the seals that match the dimensions you’re looking for without needing to know the part’s manufacturer part number.

Frequently Asked Questions

What is the difference between an SPI seal and a lip seal?
In common mechanical terminology, these two terms are generally used to refer tolip seals designed specifically for rotating shafts.

How do I determine the dimensions of my SPI seal?
Measure the inner diameter, the outer diameter, and then the thickness. For example, a dimension of 35 × 62 × 10 corresponds to an inner diameter of 35 mm, an outer diameter of 62 mm, and a thickness of 10 mm.

Can I replace an SPI seal based solely on its dimensions?
Dimensions are the primary selection criterion, but you must also verify the seal type, material, and operating conditions when these characteristics are important for installation.

How do I measure a worn lip seal?
It is best to use a vernier caliper. If the seal is severely deformed, measure the diameter of the shaft and the housing in which the seal is mounted directly.

Where are SPI seals found on a tractor?
They are used, in particular, around drive shafts, transmissions, axles, reduction gears, hubs, power take-offs, and various rotating shafts in the engine or transmission.

What does an SPI seal dimension of 40 × 60 × 10 mean?
It generally corresponds to a shaft diameter of 40 mm, an outer diameter of the seal of 60 mm, and a width of 10 mm.