The BAS hydraulic rod seal is a combination seal consisting of a wear-resistant PU lip seal and a high-elasticity NBR O-ring. The NBR O-ring acts as an energizer, providing reliable preload even under low or zero pressure conditions. This design makes the BAS seal ideal for hydraulic cylinder rod applications in excavators, loaders, and other engineering machinery.
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
Product Overview
The BAS seal features a compact design combining a PU sealing lip with an NBR O-ring energizer. The O-ring ensures consistent sealing pressure across the full pressure range, while the PU element provides excellent wear resistance and low friction. Its symmetrical design also allows for use as a piston seal in some applications.
How It Works
The BAS seal operates on a “dynamic sealing + elastic preload” mechanism. The PU lip forms the primary sealing interface with the piston rod, preventing medium leakage during reciprocating movement. The NBR O-ring applies constant preload pressure to the PU element, ensuring effective sealing even at low system pressures. As system pressure increases, a self-tightening effect enhances the seal’s contact with the rod surface.
Specifications and Parameters：
Minimum order: 10 pieces
| Parameter |
Detail |
| Product Name |
BAS Hydraulic Rod Seal |
| Type |
Combination Rod Seal (PU lip + NBR O-ring) |
| Sealing Element Material |
PU (Polyurethane) |
| Energizer Material |
NBR (Nitrile Butadiene Rubber) |
| Hardness (PU) |
90-95 Shore A |
| Hardness (NBR) |
~70 Shore A |
| Color |
Blue, Green |
| Working Pressure |
≤ 35 MPa |
| Temperature Range |
-35°C to +100°C |
| Working Speed |
≤ 0.5 m/s |
| Medium |
Mineral oil-based hydraulic oils |
| Application |
Hydraulic cylinder rod seal |
Product Features
1. Dual-Material Design
The PU component delivers exceptional wear resistance (3-5x that of standard rubber) and low friction (≤0.3 coefficient), while the NBR O-ring ensures consistent preload to compensate for wear over time.
2. Excellent Low-Pressure Performance
The NBR energizer provides reliable sealing even under low or zero pressure conditions, ensuring leak-free operation throughout the entire pressure range.
3. Insensitive to Shock Loads
The seal maintains stable performance under pressure peaks and mechanical impact, making it ideal for demanding construction and mining equipment.
4. High Resistance to Extrusion
The compact design and material strength prevent seal extrusion under high pressure, extending service life.
5. Easy Installation
The seal is designed for straightforward installation without special tools.
Applications
● Excavator hydraulic cylinders
● Loader hydraulic systems
● Bulldozer hydraulic cylinders
● Agricultural equipment cylinders
● Industrial hydraulic presses and injection molding machines
● Other medium-to-high pressure hydraulic piston rod systems
Frequently Asked Questions (FAQ)
Q: What is the difference between BAS and other rod seals?
A: BAS is a combination rod seal with an NBR O-ring energizer that provides excellent low-pressure sealing, unlike single-material U-cup seals.
Q: What is the maximum working pressure?
A: The maximum working pressure is 35 MPa.
Q: What is the temperature range?
A: The seal operates from -35°C to +100°C.
Q: What material is used?
A: The sealing lip is made of PU (90-95 Shore A), and the energizer is NBR (~70 Shore A).
Q: What color options are available?
A: We offer BAS seals in blue and green.
Q: What are your payment terms?
A: We accept T/T (bank transfer), L/C, MoneyGram, Western Union, and cash.
