Piston seals

Seals Product Introduction

**Introduction to SKF Hydraulic Seals and Piston Seals: Engineered for Performance and Reliability**

In demanding industrial and mobile hydraulic applications, sealing systems play a critical role in ensuring efficiency, longevity, and contamination control. SKF, a global leader in precision engineering, offers a comprehensive range of **hydraulic seals and piston seals** designed to meet the rigorous demands of heavy machinery, automotive systems, and precision hydraulic equipment. Combining advanced materials, innovative design, and decades of expertise, SKF seals deliver superior leak prevention, reduced friction, and extended service life—even under extreme pressures, temperatures, and dynamic operating conditions.

### **Technical Features and Innovation**
SKF hydraulic seals and piston seals are engineered with cutting-edge technologies to address common challenges such as fluid leakage, wear, and energy loss. Key features include:

– **High-Performance Materials**: SKF utilizes specialized polyurethane (PU), nitrile rubber (NBR), and thermoplastic materials tailored for compatibility with hydraulic fluids, aggressive media, and wide temperature ranges (-40°C to +200°C).
– **Optimized Seal Geometry**: Precision-designed lip profiles and sealing edges ensure minimal friction while maintaining consistent pressure distribution, reducing stick-slip effects and improving responsiveness.
– **Robust Construction**: Reinforced backings and anti-extrusion rings prevent seal deformation under high pressure (up to 500 bar or higher in some applications), even in pulsating or shock-load scenarios.
– **Contamination Resistance**: Integrated wipers and scrapers in rod seal systems protect hydraulic cylinders from particulate ingress, extending component life.

### **Performance Advantages**
SKF seals enhance system performance through:

– **Leak-Free Operation**: Advanced sealing lips and dynamic sealing surfaces minimize fluid loss, maintaining hydraulic efficiency and reducing environmental impact.
– **Durability**: Engineered to withstand abrasive conditions, SKF seals outperform standard seals in lifespan, reducing downtime and maintenance costs.
– **Energy Efficiency**: Low-friction designs lower power consumption in hydraulic systems, contributing to sustainability goals.
– **Versatility**: Suitable for reciprocating, rotary, and static applications across industries.

### **Typical Applications**
SKF hydraulic and piston seals are trusted in critical applications, including:

– **Industrial Machinery**: Hydraulic presses, injection molding machines, and CNC equipment requiring precision motion control.
– **Mobile Hydraulics**: Excavators, loaders, and agricultural machinery operating under variable loads and harsh environments.
– **Automotive Systems**: Brake cylinders, power steering units, and suspension components demanding reliability and safety.
– **Precision Equipment**: Aerospace actuators and medical hydraulic systems where failure is not an option.

By integrating SKF seals into hydraulic systems, engineers and maintenance teams achieve enhanced reliability, reduced total cost of ownership, and compliance with industry standards. Whether for OEM designs or aftermarket replacements, SKF’s sealing solutions represent the forefront of performance-driven engineering.

For more details on material specifications, custom configurations, or application support, explore SKF’s technical resources or consult with their engineering team.

MORE +
CLOSE +
Designation Cylinder bore diameter Piston groove diameter Piston groove width Primary sealing element Mass
UNP-100X80X13-E6W
100.0 mm
80.0 mm
13.2 mm
Polyurethane (TPU U-1029)
0.034 kg
UNP-110X90X13-E6W
110.0 mm
90.0 mm
13.2 mm
Polyurethane (TPU U-1029)
0.036 kg
UNP-120X100X13-E6W
120.0 mm
100.0 mm
13.2 mm
Polyurethane (TPU U-1029)
0.0356 kg
UNP-180X165X10-E6W
180.0 mm
165.0 mm
10.0 mm
Polyurethane (TPU U-1029)
0.0391 kg
UNP-40X30X7-E6W
40.0 mm
30.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0037 kg
UNP-45X35X7-E6W
45.0 mm
35.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0039 kg
GH2D-7750-AD1
196.85 mm
183.69 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0305 kg
GH2D-8500-AD1
215.9 mm
202.74 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0332 kg
GH2D-9500-AD1
241.3 mm
228.14 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0376 kg
GH3A-10000-AD1
254.0 mm
238.35 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.068 kg
GH3A-11000-AD1
279.4 mm
263.75 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.074 kg
GH3A-3125-AD1
79.38 mm
63.73 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0198 kg
GH3A-4375-AD1
111.13 mm
95.48 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0286 kg
GH3A-4875-AD1
123.83 mm
108.18 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.032 kg
GH3A-5500-AD1
139.7 mm
124.05 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0364 kg
GH3A-5875-AD1
149.23 mm
133.58 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.039 kg
GH3A-6125-AD1
155.58 mm
139.93 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0408 kg
GH3A-6250-AD1
158.75 mm
143.1 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0417 kg
GH4A-10000-AD1
254.0 mm
232.92 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.118 kg
GH4A-10500-AD1
266.7 mm
245.62 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.125 kg
GH4A-11500-AD1
292.1 mm
271.02 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.137 kg
GH4A-12500-AD1
317.5 mm
296.42 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.15 kg
GH4A-5250-AD1
133.35 mm
112.27 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.0609 kg
GH4A-5375-AD1
136.53 mm
115.44 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.0616 kg