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
S9B-40X50.7X4.2-AD1
40.0 mm
50.7 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0058 kg
PTB437-4750-750-J1S
120.65 mm
142.85 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0974 kg
RBB3-6000-E6T
152.4 mm
168.05 mm
6.27 mm
Polyurethane (TPU U-1029)
0.0199 kg
PTB500-10625-750-J1S
269.88 mm
295.28 mm
20.96 mm
Polyurethane (TPU U-1003)
0.241 kg
PTB500-24500-750-J1S
622.3 mm
647.7 mm
20.96 mm
Polyurethane (TPU U-1003)
0.541 kg
PTB500-3250-750-J1S
82.55 mm
107.95 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0811 kg
PTB500-3750-690-J1S
95.25 mm
120.65 mm
19.28 mm
Polyurethane (TPU U-1003)
0.0846 kg
PTB500-4000-625-J1S
101.6 mm
127.0 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0813 kg
PTB625-16000-1125-J1S
406.4 mm
438.15 mm
31.43 mm
Polyurethane (TPU U-1003)
0.677 kg
PTB625-3750-1000-J1S
95.25 mm
127.0 mm
27.94 mm
Polyurethane (TPU U-1003)
0.156 kg
PTB625-5000-1000-J1S
127.0 mm
158.75 mm
27.94 mm
Polyurethane (TPU U-1003)
0.201 kg
PTB625-5750-1000-J1S
146.05 mm
177.8 mm
27.94 mm
Polyurethane (TPU U-1003)
0.227 kg
PTB750-10500-1000-J1S
266.7 mm
304.8 mm
27.94 mm
Polyurethane (TPU U-1003)
0.493 kg
PTB750-20000-1250-J1S
508.0 mm
546.1 mm
34.93 mm
Polyurethane (TPU U-1003)
1.13 kg
RBB-135X150.1X6.3-J0S
135.0 mm
150.1 mm
6.3 mm
Polyurethane (TPU U-1029)
0.0191 kg
PTB375-6750-500-J1S
171.45 mm
190.5 mm
13.97 mm
Polyurethane (TPU U-1003)
0.077 kg
RBB-45X60.1X6.3-J0S
45.0 mm
60.1 mm
6.3 mm
Polyurethane (TPU U-1029)
0.0068 kg
PTB375-6875-625-J1S
174.63 mm
193.68 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0978 kg
RBB-95X110.5X6.3-J0S
95.0 mm
110.5 mm
6.3 mm
Polyurethane (TPU U-1029)
0.0136 kg
PTB406-8500-500-J1S
215.9 mm
236.52 mm
13.97 mm
Polyurethane (TPU U-1003)
0.111 kg