In many systems with moving shafts and rotating components, the oil seal might not be the most visible part—but it’s often one of the most essential. A failure in sealing can mean more than a few drops of leakage; it could be the beginning of system contamination, bearing wear, or even complete mechanical breakdown. That’s where DEDE is TG4 rotary shaft oil seal steps in, offering a refined sealing solution for real-world mechanical demands.
What Makes TG4 Seals Different?
At a glance, TG4 might resemble conventional shaft seals like TC, TB, or VC types. But under the surface, it’s a different breed. Designed with three internal sealing lips, the TG4 provides an extra layer of protection, especially in systems exposed to mixed contaminants or variable shaft speeds.
Each lip has a specific role:
· The primary lip holds in lubricants under pressure.
· The secondary lip functions as a dust barrier, shielding the seal from debris.
· The tertiary lip helps stabilize the seal under shaft movement, adding a buffer against eccentric wear or axial play.
Together, they form a triple-action seal that’s especially well-suited for dirty, dynamic, or vibration-prone environments.
Grooved Outer Diameter: Form with Function
Another characteristic feature of the TG4 series is the corrugated outer shell—a subtle yet smart design element. Unlike smooth-body seals, this grooved OD helps lock the seal more securely into its housing. This ensures better static retention and reduces the risk of “spin-out” during thermal cycles or vibration—common issues in heavy-duty equipment.
Whether it’s a mining gearbox, agricultural PTO system, or a servo-driven motor exposed to heat cycling, this grip-enhanced design adds meaningful long-term value.
Material Matters: NBR & FKM Options
DEDE offers TG4 oil seals in two primary elastomers:
· NBR (Nitrile Rubber) is a workhorse in the world of sealing. It holds up well against oils, greases, and general-purpose lubricants. NBR is also cost-effective and suitable for shaft speeds and temperatures common in automotive, general manufacturing, and hydraulic machinery.
· FKM (Fluoroelastomer) offers higher resistance against heat and aggressive media. When working in transmission gearboxes or high-speed spindles, FKM gives a performance edge by holding its shape and flexibility longer—even under thermal or chemical stress.
These materials are then bonded to a reinforced steel skeleton, ensuring the seal holds its geometry even when temperatures or speeds ramp up.
A seal is only as good as it performs in the field. The TG4 series has seen successful implementation in:
· Industrial Gear Units – maintaining lubrication under load with minimal axial shaft drift.
· Wind Turbine Nacelles – resisting fine dust, moisture, and shaft flutter over long maintenance cycles.
· Automated Robot Arms – maintaining tight seals despite fast reciprocating motion and short installation space.
· Diesel Engine Accessories – used in crankshafts, camshafts, and gear-driven
water/oil pumps.
Because TG4 is a direct-fit replacement for many standard profiles (TC, TB, TC4, VC, etc.), switching to this series often requires no major hardware changes—just better performance from day one.
Why TG4 Matters in Rotary Applications
Shaft seals are not just passive barriers. In rotary systems, they must:
· Withstand radial shaft loads
· Absorb thermal expansion
· Prevent airborne and fluid contamination
· Maintain a tight hydraulic pressure differential
TG4's triple-lip construction and optimized material blend help it perform all these functions consistently. It adapts to both low-pressure, low-viscosity lubricants and heavier industrial greases—while avoiding common failures like lip curling, shell deformation, or spring fatigue.
At DEDE, we don’t just ship boxes of parts—we partner with industries to design smarter sealing systems. Our core offerings include:
· Fast Dispatch from Stock: Over 10,000 part numbers of O-rings, shaft seals, and custom elastomer components always ready to go.
· Full-Cycle Engineering Service: From material selection to CAD-based design, prototyping, testing, and production.
· Sealing Performance Optimization: We help clients reduce wear rates, avoid over-specification, and improve mean time between failures.
With over 30 years of experience, DEDE serves clients in over 80 countries, offering a product line that includes standard and non-standard sizes across a range of industries.
TG4 rotary seals are particularly effective in:
· Gearboxes & Transmissions – automotive, truck, and off-road
· Electric Motors & Generators – especially where axial movement or shaft misalignment is a concern
· Agricultural Implements – tillers, balers, harvesters
· Construction Equipment – excavators, rollers, and loaders
· Wind Energy – yaw and pitch control
· Factory Automation – conveyors, actuators, CNC rotary spindles
Everywhere there is rotation, pressure, heat, or contamination—TG4 is a reliable choice.
Need a tailored solution?
If your application involves specific chemical exposure, temperature limits,
or unconventional shaft profiles, DEDE can custom engineer a sealing solution
using our in-house materials lab and production facilities.
