TG4 Rotary Shaft Oil Seal With Triple Lip Design for Heavy Duty Machinery

Not every machine breakdown makes headlines, but if you’ve ever had to shut
down an entire system because of a leaking seal, you know how disruptive it can
be. In many of the machines I’ve worked with—especially in automotive and
heavy equipment—the smallest components often determine the biggest outcomes.
That’s where the TG4 rotary shaft seal comes into play.

What makes the TG4 oil seal different?
The TG4 seal isn’t your typical oil seal. It has a three-lip structure that
offers better protection than the standard two-lip versions (like TC or TB).
This extra lip isn’t just for show—it helps deal with dust, moisture, and
unexpected pressure surges that traditional designs often fail to handle. One
client running hydraulic presses in a dusty environment made the switch and saw
a drop in unplanned maintenance in just two months.

Another key feature is the wave-shaped outer diameter. It’s subtle, but it
improves grip and prevents rotation inside the housing—something that’s often
overlooked until a seal spins out and causes a mess.

Built for real-world use
The TG4 uses nitrile rubber (NBR) for the lip and a steel core for structural
support. This combination is known for its durability and oil resistance.
You’ll find seals like these in gearboxes, shock absorbers, pump shafts, and
axles. While FKM is an option in higher heat scenarios, NBR tends to be the go-
to for most users thanks to its balanced performance and price.

Inside, a spring keeps the lip under tension, which is crucial if the shaft
speed fluctuates or if you're dealing with pressure spikes.

When should you consider TG4?
From what we’ve seen in the field, TG4 performs well in:

Off-road vehicles and construction machinery, where dust and vibration are
nonstop.

Gear-driven equipment with long duty cycles and limited shutdown windows.

Hydraulic motors and pumps, where even a small leak can cause major losses.

Energy systems, such as wind turbines or generators, where long-term
reliability matters.

If your equipment isn’t sitting in a climate-controlled lab but out there in
mud, dust, or oil mist, this seal has likely been designed with your challenges
in mind.

Not just another spec sheet
We’ve sold TG4 seals to dozens of countries, and while we keep over 10,000
sizes in stock, customization is where we really shine. Need a specific lip
material? A different spring tension? Slightly oversized for an old shaft? No
problem. We’ve seen some strange setups over the years, and we usually find a
solution.

One example: a customer in South America needed TG4-type seals for an outdated
turbine drive. None of the catalog specs fit. We reverse-engineered their
housing dimensions and sent a batch of custom units. They’ve been using them
ever since.

Why work with DEDE?
We’ve been in this business for over three decades. Unlike trading platforms
that just ship parts, we actually design and produce our seals. That means we
know what goes into each one—and we can stand behind their performance.

What we offer:

Fast dispatch on common sizes

Fully customized designs for special applications

Engineering support when you need to troubleshoot or upgrade your system

Competitive pricing without cutting corners on materials

Final thoughts
The TG4 rotary shaft seal isn’t flashy. But if you’re in an industry where
downtime costs money, it’s one of those parts you don’t want to cut corners
on. We’ve seen it outperform traditional seals time and again—especially
where other designs fell short due to dust, vibration, or heat.

If you’re unsure whether TG4 is right for your setup, get in touch. We can
take a look at your working conditions and help match the right material and
structure.

At the end of the day, a good seal is the difference between weeks of smooth
operation and an unexpected repair job. The TG4 helps tip the odds in your
favor.

Minimum Order: 500 pieces

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