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
GH1A-2375-AD1
60.33 mm
52.76 mm
3.25 mm
Polytetrafluoroethylene (PTFE 741)
0.0038 kg
GH1A-3000-AD1
76.2 mm
68.63 mm
3.25 mm
Polytetrafluoroethylene (PTFE 741)
0.0049 kg
LTP-209-E3R
23.81 mm
17.67 mm
4.75 mm
Nitrile Rubber (NBR A-8501)
0.0012 kg
LTP-211-E3R
26.99 mm
20.84 mm
4.75 mm
Nitrile Rubber (NBR A-8501)
0.0014 kg
LTP-430-E3R
142.93 mm
130.89 mm
9.53 mm
Nitrile Rubber (NBR A-8501)
0.0273 kg
LTP-447-E3R
241.35 mm
229.31 mm
9.53 mm
Nitrile Rubber (NBR A-8501)
0.0483 kg
SCP2-4525-E5D
114.94 mm
100.76 mm
7.16 mm
Polyamide (PA P-2551)
0.0359 kg
SCP3-5000-E5D
127.0 mm
107.7 mm
9.58 mm
Polyamide (PA P-2551)
0.0567 kg
UNP-290X265X20.5-E6W
290.0 mm
265.0 mm
20.5 mm
Polyurethane (TPU U-1029)
0.231 kg
UNP-50X40X8.3-E6W
50.0 mm
40.0 mm
8.3 mm
Polyurethane (TPU U-1029)
0.006 kg
UNP-63X48X11-E6W
63.0 mm
48.0 mm
11.0 mm
Polyurethane (TPU U-1029)
0.0136 kg
UNP250-2500-312-H9J
76.2 mm
63.5 mm
8.72 mm
Polyurethane (TPU U-1023)
0.0112 kg
UNP250-4500-375-H9J
127.0 mm
114.3 mm
10.48 mm
Polyurethane (TPU U-1023)
0.0237 kg
UNP500-3000-500-H9J
101.6 mm
76.2 mm
13.97 mm
Polyurethane (TPU U-1023)
0.0438 kg
APR-190X169X8.1-AD1
190.0 mm
169.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0721 kg
APR-45X34X4.2-AD1
45.0 mm
34.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0044 kg
APR2-1000-AD1
25.4 mm
14.63 mm
5.33 mm
Polytetrafluoroethylene (PTFE 741)
0.0018 kg
APR2-1500-AD1
38.1 mm
27.33 mm
5.33 mm
Polytetrafluoroethylene (PTFE 741)
0.0045 kg
APR3-4250-AD1
107.95 mm
92.3 mm
7.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0269 kg
APR3-4750-AD1
120.65 mm
105.0 mm
7.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0152 kg
APR4-8661-AD1
219.99 mm
198.65 mm
9.53 mm
Polytetrafluoroethylene (PTFE 741)
0.395 kg
APR4-9500-AD1
241.3 mm
219.96 mm
9.53 mm
Polytetrafluoroethylene (PTFE 741)
0.111 kg
GH3A-3625-AD1
92.08 mm
76.43 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0233 kg
GH3A-3750-AD1
95.25 mm
79.6 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0242 kg