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
APR5-11500-AD1
292.1 mm
268.73 mm
9.53 mm
Polytetrafluoroethylene (PTFE 741)
0.161 kg
CPV-217-J1S
36.51 mm
30.37 mm
4.75 mm
Polyurethane (TPU U-1003)
0.0014 kg
CPV-346-J1S
114.3 mm
104.9 mm
7.14 mm
Polyurethane (TPU U-1003)
0.0112 kg
CPV-441-J1S
190.55 mm
178.51 mm
9.53 mm
Polyurethane (TPU U-1003)
0.0335 kg
CPV-448-J1S
254.05 mm
242.01 mm
9.53 mm
Polyurethane (TPU U-1003)
0.0332 kg
DPV-328-K0M
57.15 mm
47.75 mm
7.14 mm
Polyurethane (X-ECOPUR PS)
0.006 kg
DPV-330-K0M
63.5 mm
54.1 mm
7.14 mm
Polyurethane (X-ECOPUR PS)
0.006 kg
GH 260X239X8.1-AD1
260.0 mm
239.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 292)
0.124 kg
GH 450X425.5X8.1-AD1
450.0 mm
425.5 mm
8.1 mm
Polytetrafluoroethylene (PTFE 292)
0.274 kg
GH0A-1062-AD1
26.97 mm
22.56 mm
2.11 mm
Polytetrafluoroethylene (PTFE 741)
0.0005 kg
GH0A-1125-AD1
28.58 mm
24.16 mm
2.11 mm
Polytetrafluoroethylene (PTFE 741)
0.0006 kg
GH0A-1187-AD1
30.15 mm
25.73 mm
2.11 mm
Polytetrafluoroethylene (PTFE 741)
0.0006 kg
GH0A-1312-AD1
33.32 mm
28.91 mm
2.11 mm
Polytetrafluoroethylene (PTFE 741)
0.0007 kg
GH0A-687-AD1
17.45 mm
13.03 mm
2.11 mm
Polytetrafluoroethylene (PTFE 741)
0.0003 kg
UNP-65X55X7-E6W
65.0 mm
55.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0061 kg
UNP-80X70X7-E6W
80.0 mm
70.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.009 kg
UNP187-2875-250-H9J
82.55 mm
73.03 mm
6.99 mm
Polyurethane (TPU U-1023)
0.0075 kg
UNP375-4250-500-H9J
127.0 mm
107.95 mm
13.97 mm
Polyurethane (TPU U-1023)
0.047 kg
UNP500-2000-500-H9J
76.2 mm
50.8 mm
13.97 mm
Polyurethane (TPU U-1023)
0.0324 kg
UNP500-2250-500-H9J
82.55 mm
57.15 mm
13.97 mm
Polyurethane (TPU U-1023)
0.0358 kg
VSS 8X10.8X10 NEFZ
0.00182 kg
APR-115X99.5X6.3-AD1
115.0 mm
99.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0242 kg
APR-120X104.5X6.3-AD1
120.0 mm
104.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0252 kg
APR-140X124.5X6.3-AD1
140.0 mm
124.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0299 kg