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.

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Designation Cylinder bore diameter Piston groove diameter Piston groove width Primary sealing element Mass
SCP3-5025-E5D
127.64 mm
108.33 mm
9.58 mm
Polyamide (PA P-2551)
0.0567 kg
SCP3-5750-E5D
146.05 mm
126.75 mm
9.58 mm
Polyamide (PA P-2551)
0.06 kg
SCP3-6025-E5D
153.04 mm
133.73 mm
9.58 mm
Polyamide (PA P-2551)
0.0613 kg
UNP-100X85X10-E6W
100.0 mm
85.0 mm
10.0 mm
Polyurethane (TPU U-1029)
0.0212 kg
UNP-280X255X20.5-E6W
280.0 mm
255.0 mm
20.5 mm
Polyurethane (TPU U-1029)
0.223 kg
UNP-60X50X7-E6W
60.0 mm
50.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0055 kg
GH1D-5125-AD1
130.18 mm
120.22 mm
3.28 mm
Polytetrafluoroethylene (PTFE 741)
0.012 kg
GH2A-2875-AD1
73.03 mm
62.26 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0087 kg
GH2A-3250-AD1
82.55 mm
71.78 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.01 kg
GH2A-3375-AD1
85.73 mm
74.96 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0104 kg
GH2A-3500-AD1
88.9 mm
78.13 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0108 kg
GH2A-3625-AD1
92.08 mm
81.31 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0112 kg
GH2A-3750-AD1
95.25 mm
84.48 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0116 kg
GH2A-3875-AD1
98.43 mm
87.66 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.012 kg
GH2A-4125-AD1
104.78 mm
94.01 mm
4.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0129 kg
GH2D-11500-AD1
292.1 mm
278.94 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0456 kg
GH2D-6000-AD1
152.4 mm
139.24 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0234 kg
GH2D-9000-AD1
228.6 mm
215.44 mm
4.04 mm
Polytetrafluoroethylene (PTFE 741)
0.0356 kg
GH3A-10500-AD1
266.7 mm
251.05 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0715 kg
GH3A-12000-AD1
304.8 mm
289.15 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.081 kg
GH3A-3875-AD1
98.43 mm
82.78 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0251 kg
GH3A-5250-AD1
133.35 mm
117.7 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0347 kg
GH3A-5625-AD1
142.88 mm
127.23 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0373 kg
GH3A-5750-AD1
146.05 mm
130.4 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0382 kg