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
PTB500-5500-750-J1S
139.7 mm
165.1 mm
20.96 mm
Polyurethane (TPU U-1003)
0.13 kg
PTB500-5750-750-J1S
146.05 mm
171.45 mm
20.96 mm
Polyurethane (TPU U-1003)
0.135 kg
PTB500-6750-750-J1S
171.45 mm
196.85 mm
20.96 mm
Polyurethane (TPU U-1003)
0.157 kg
PTB500-7000-750-J1S
177.8 mm
203.2 mm
20.96 mm
Polyurethane (TPU U-1003)
0.162 kg
RBB-65X80.5X6.3-J0S
65.0 mm
80.5 mm
6.3 mm
Polyurethane (TPU U-1029)
0.0096 kg
RBB-80X95.1X6.3-J0S
80.0 mm
95.1 mm
6.3 mm
Polyurethane (TPU U-1029)
0.0113 kg
RBB3-2250-E6T
57.15 mm
72.8 mm
6.27 mm
Polyurethane (TPU U-1029)
0.0117 kg
RSB3-2500-AD2
63.5 mm
79.15 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0402 kg
RSB3-3000-AD2
76.2 mm
91.85 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0503 kg
RSB4-7000-AD2
177.8 mm
198.88 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.329 kg
RSB4-9000-AD2
228.6 mm
249.68 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.427 kg
S1S-100X115X11
100.0 mm
115.0 mm
11.0 mm
ECOPUR
0.03 kg
S1S-100X115X13
100.0 mm
115.0 mm
13.0 mm
ECOPUR
0.05 kg
S1S-105X125X13
105.0 mm
125.0 mm
13.0 mm
ECOPUR
0.051 kg
S1S-110X125X12
110.0 mm
125.0 mm
12.0 mm
ECOPUR
0.2 kg
S1S-110X130X11
110.0 mm
130.0 mm
11.0 mm
ECOPUR
0.0448 kg
PTB312-3000-375-J1S
76.2 mm
92.05 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0222 kg
PTB312-3125-500-J1S
79.38 mm
95.22 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0308 kg
PTB312-4000-562-J1S
101.6 mm
117.45 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0433 kg
PTB312-4500-500-J1S
114.3 mm
130.15 mm
13.97 mm
Polyurethane (TPU U-1003)
0.043 kg
PTB312-4500-625-J1S
114.3 mm
130.15 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0537 kg
PTB312-4750-625-J1S
120.65 mm
136.5 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0565 kg
PTB312-5750-625-J1S
146.05 mm
161.9 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0678 kg
PTB312-6375-625-J1S
161.93 mm
177.77 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0748 kg