Rod and buffer seals

Seals Product Introduction

**Introduction to SKF Hydraulic Seals: Rod and Buffer Seals for Demanding Industrial Applications**

In hydraulic systems, maintaining optimal performance and reliability depends on the integrity of sealing solutions. SKF, a global leader in precision engineering, offers a comprehensive range of **hydraulic seals**, including specialized **rod seals** and **buffer seals**, designed to withstand extreme pressures, dynamic motion, and harsh operating conditions. These seals play a critical role in preventing fluid leakage, minimizing friction, and extending the service life of hydraulic cylinders and other industrial machinery.

### **Technical Features and Design Excellence**
SKF hydraulic rod and buffer seals are engineered with advanced materials and innovative geometries to deliver superior sealing performance. Key features include:

– **High-Pressure Resistance**: Constructed from durable polyurethane (PU) or thermoplastic materials, SKF rod seals are optimized to handle high-pressure cycles (up to 40 MPa or more) without extrusion or premature wear.
– **Low Friction and Energy Efficiency**: Precision-machined sealing lips reduce friction, ensuring smooth rod movement and improving energy efficiency in hydraulic systems.
– **Enhanced Contamination Resistance**: Integrated wiper designs in buffer seals prevent dirt, moisture, and particulate ingress, protecting critical hydraulic components from damage.
– **Temperature and Chemical Compatibility**: SKF seals perform reliably across a wide temperature range (-30°C to +110°C) and resist degradation from hydraulic fluids, oils, and aggressive media.

### **Performance Advantages for Industrial Applications**
SKF hydraulic seals are trusted in industries where reliability and durability are non-negotiable. Their benefits include:

– **Extended Service Life**: Reduced wear and tear due to optimized material compounds and dynamic sealing profiles.
– **Leakage Prevention**: Tight sealing action maintains system pressure, reducing downtime and maintenance costs.
– **Shock Absorption (Buffer Seals)**: In high-pressure applications, buffer seals act as secondary protection, absorbing pressure spikes and preventing primary seal failure.

### **Typical Applications**
SKF rod and buffer seals are widely used in:

– **Industrial Machinery**: Hydraulic presses, injection molding machines, and construction equipment (e.g., excavators, loaders).
– **Automotive Systems**: Suspension cylinders, braking systems, and heavy-duty truck hydraulics.
– **Precision Equipment**: Aerospace actuators, marine hydraulic systems, and robotic automation.

By combining cutting-edge materials, rigorous testing, and application-specific designs, SKF hydraulic seals ensure **long-term reliability**, **efficiency**, and **cost savings** for demanding industrial environments. Whether in mobile hydraulics or stationary machinery, SKF’s sealing solutions help operators achieve peak performance while minimizing environmental impact through reduced fluid leakage.

For engineers and maintenance professionals seeking high-performance sealing solutions, SKF’s rod and buffer seals represent a proven choice for enhancing hydraulic system longevity and operational efficiency.

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Designation Rod diameter Housing groove diameter Housing groove width Primary sealing element Mass
RSB4-4500-AD2
114.3 mm
135.38 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.165 kg
S9B-105X120.1X6.3-AD1
105.0 mm
120.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0285 kg
S9B-140X155.1X6.3-AD1
140.0 mm
155.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0374 kg
S9B-14X21.5X3.2-AD1
14.0 mm
21.5 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0011 kg
S9B-157X172.5X6.3-AD1
157.0 mm
172.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.01 kg
S9B-160X181X8.1-AD1
160.0 mm
181.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0769 kg
S9B-16X23.5X3.2-AD1
16.0 mm
23.5 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0012 kg
S9B-175X190.5X6.3-AD1
175.0 mm
190.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0876 kg
S9B-220X240.5X8.1-AD1
220.0 mm
240.5 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.103 kg
S9B-220X241X8.1-AD1
220.0 mm
241.0 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.105 kg
S9B-250X270.5X8.1-AD1
250.0 mm
270.5 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.116 kg
S9B-45X56X4.2-AD1
45.0 mm
56.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0067 kg
S9B-63X78.5X6.3-AD1
63.0 mm
78.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0182 kg
S9B-65X80.1X6.3-AD1
65.0 mm
80.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0182 kg
S9B-70X85.5X6.3-AD1
70.0 mm
85.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0199 kg
S9B-75X90.1X6.3-AD1
75.0 mm
90.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0207 kg
S9B1-1125-AD1
28.58 mm
36.14 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.002 kg
PTB375-7750-500-J1S
196.85 mm
215.9 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0878 kg
PTB375-9000-625-J1S
228.6 mm
247.65 mm
17.46 mm
Polyurethane (TPU U-1003)
0.126 kg
PTB437-4000-750-J1S
101.6 mm
123.8 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0833 kg
PTB500-1250-750-J1S
31.75 mm
57.15 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0379 kg
PTB500-9250-750-J1S
234.95 mm
260.35 mm
20.96 mm
Polyurethane (TPU U-1003)
0.211 kg
PTB625-11000-1000-J1S
279.4 mm
311.15 mm
27.94 mm
Polyurethane (TPU U-1003)
0.414 kg
PTB625-15500-1000-J1S
393.7 mm
425.45 mm
27.94 mm
Polyurethane (TPU U-1003)
0.575 kg