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
APR-170X149X8.1-AD1
170.0 mm
149.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0659 kg
APR-20X9X4.2-AD1
20.0 mm
9.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0017 kg
APR-250X229X8.1-AD1
250.0 mm
229.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0842 kg
APR-28X17X4.2-AD1
28.0 mm
17.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0025 kg
APR-42X31X4.2-AD1
42.0 mm
31.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0041 kg
APR-55X44X4.2-AD1
55.0 mm
44.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0055 kg
APR-65X54X4.2-AD1
65.0 mm
54.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0067 kg
APR-95X79.5X6.3-AD1
95.0 mm
79.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0197 kg
APR2-1250-AD1
31.75 mm
20.98 mm
5.33 mm
Polytetrafluoroethylene (PTFE 741)
0.0037 kg
APR3-2750-AD1
69.85 mm
54.2 mm
7.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0165 kg
GH3A-8000-AD1
203.2 mm
187.55 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0536 kg
GH3A-8250-AD1
209.55 mm
193.9 mm
6.32 mm
Polytetrafluoroethylene (PTFE 741)
0.0554 kg
GH4A-11000-AD1
279.4 mm
258.32 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.131 kg
GH4A-14500-AD1
368.3 mm
347.22 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.17 kg
GH4A-6375-AD1
161.93 mm
140.84 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.0748 kg
GH4A-7250-AD1
184.15 mm
163.07 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.0843 kg
GH4A-9000-AD1
228.6 mm
207.52 mm
8.18 mm
Polytetrafluoroethylene (PTFE 741)
0.106 kg
LCP-60X50X8-ND1
60.0 mm
50.0 mm
8.0 mm
Polytetrafluoroethylene (PTFE 741)
0.011 kg
LCP6-14000-ND1
355.6 mm
337.06 mm
19.05 mm
Polytetrafluoroethylene (PTFE 741)
0.35 kg
LCP6-16000-ND1
406.4 mm
387.86 mm
19.05 mm
Polytetrafluoroethylene (PTFE 741)
1.29 kg
LTP-349-E3R
123.83 mm
114.43 mm
7.14 mm
Nitrile Rubber (NBR A-8501)
0.014 kg
LTP-431-E3R
146.1 mm
134.06 mm
9.53 mm
Nitrile Rubber (NBR A-8501)
0.0717 kg
LTP-442-E3R
196.9 mm
184.86 mm
9.53 mm
Nitrile Rubber (NBR A-8501)
0.0107 kg
SCP1-2250-E5D
57.15 mm
43.48 mm
7.16 mm
Polyamide (PA P-2551)
0.0304 kg