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
RBB3-5000-E6T
127.0 mm
142.65 mm
6.27 mm
Polyurethane (TPU U-1029)
0.0168 kg
RBB3-7000-E6T
177.8 mm
193.45 mm
6.27 mm
Polyurethane (TPU U-1029)
0.0247 kg
RBB3-8000-E6T
203.2 mm
218.85 mm
6.27 mm
Polyurethane (TPU U-1029)
0.0281 kg
RSB2-2500-AD2
63.5 mm
74.27 mm
4.22 mm
Polytetrafluoroethylene (PTFE 741)
0.0364 kg
RSB4-5000-AD2
127.0 mm
148.08 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.209 kg
PTB187-5750-375-J1S
146.05 mm
155.55 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0242 kg
PTB218-2500-281-J1S
63.5 mm
74.57 mm
7.85 mm
Polyurethane (TPU U-1003)
0.0109 kg
PTB250-4125-562-J1S
104.78 mm
117.48 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0354 kg
PTB250-6750-562-J1S
171.45 mm
184.15 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0569 kg
PTB250-7125-562-J1S
180.98 mm
193.68 mm
15.7 mm
Polyurethane (TPU U-1003)
0.06 kg
PTB250-8375-562-J1S
212.73 mm
225.43 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0701 kg
PTB281-3437-500-J1S
87.3 mm
101.57 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0305 kg
PTB312-1500-437-J1S
38.1 mm
53.95 mm
12.21 mm
Polyurethane (TPU U-1003)
0.0142 kg
PTB312-5625-625-J1S
142.88 mm
158.72 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0664 kg
PTB375-14250-625-J1S
361.95 mm
381.0 mm
17.46 mm
Polyurethane (TPU U-1003)
0.197 kg
PTB375-2187-625-J1S
55.55 mm
74.6 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0346 kg
PTB375-2875-625-J1S
73.03 mm
92.08 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0438 kg
PTB437-4500-750-J1S
114.3 mm
136.5 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0927 kg
PTB500-11750-750-J1S
298.45 mm
323.85 mm
20.96 mm
Polyurethane (TPU U-1003)
0.265 kg
PTB500-1750-750-J1S
44.45 mm
69.85 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0487 kg
PTB500-5875-750-J1S
149.23 mm
174.63 mm
20.96 mm
Polyurethane (TPU U-1003)
0.138 kg
PTB500-6000-750-J1S
152.4 mm
177.8 mm
20.96 mm
Polyurethane (TPU U-1003)
0.141 kg
PTB500-6250-750-J1S
158.75 mm
184.15 mm
20.96 mm
Polyurethane (TPU U-1003)
0.146 kg
PTB562-4000-750-J1S
101.6 mm
130.15 mm
20.96 mm
Polyurethane (TPU U-1003)
0.11 kg