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
SCP3-7000-E5E
177.8 mm
158.5 mm
9.58 mm
Polyamide (PA P-2501)
0.0569 kg
SCP3-8000-E5D
203.2 mm
183.9 mm
9.58 mm
Polyamide (PA P-2551)
0.0683 kg
SCP5-4000-E5E
101.6 mm
86.56 mm
7.92 mm
Polyamide (PA P-2501)
0.0209 kg
SCP5-4500-E5D
114.3 mm
99.26 mm
7.92 mm
Polyamide (PA P-2551)
0.0402 kg
UNP-140X120X16.5-E6W
140.0 mm
120.0 mm
16.5 mm
Polyurethane (TPU U-1029)
0.0727 kg
UNP-210X190X13-E6W
210.0 mm
190.0 mm
13.2 mm
Polyurethane (TPU U-1029)
0.0841 kg
UNP-230X205X22-E6W
230.0 mm
205.0 mm
22.0 mm
Polyurethane (TPU U-1029)
0.195 kg
UNP-50X40X7-E6W
50.0 mm
40.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0072 kg
UNP250-3500-375-H9J
101.6 mm
88.9 mm
10.48 mm
Polyurethane (TPU U-1023)
0.0187 kg
APR-125X109.5X6.3-AD1
125.0 mm
109.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0264 kg
APR-145X129.5X6.3-AD1
145.0 mm
129.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.031 kg
APR-165X144X8.1-AD1
165.0 mm
144.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0632 kg
APR-25X14X4.2-AD1
25.0 mm
14.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0023 kg
APR3-3500-AD1
88.9 mm
73.25 mm
7.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0215 kg
APR3-5000-AD1
127.0 mm
111.35 mm
7.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0316 kg
APR4-10000-AD1
254.0 mm
232.66 mm
9.53 mm
Polytetrafluoroethylene (PTFE 741)
0.117 kg
CPV-213-J1S
30.16 mm
24.02 mm
4.75 mm
Polyurethane (TPU U-1003)
0.001 kg
CPV-433-J1S
152.45 mm
140.41 mm
9.53 mm
Polyurethane (TPU U-1003)
0.0262 kg
MD 220X190X35.4-L
220.0 mm
190.0 mm
35.4 mm
Nitrile Rubber (N80/047)
0.446 kg
MD 25X15X12.4-L
25.0 mm
15.0 mm
12.4 mm
Nitrile Rubber (N80/047)
0.0059 kg
MD 30X21X13.5-L
30.0 mm
21.0 mm
13.5 mm
Nitrile Rubber (N80/047)
0.0062 kg
MD 35X25X15.5-L
35.0 mm
25.0 mm
15.5 mm
Nitrile Rubber (N80/047)
0.0086 kg
MD 55X39X20.5-L
55.0 mm
39.0 mm
20.5 mm
Nitrile Rubber (N80/047)
0.0302 kg
MD 56X40X20.5-L
56.0 mm
40.0 mm
20.5 mm
Nitrile Rubber (N80/047)
0.05 kg