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-120X135.1X6.3-AD1
120.0 mm
135.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0324 kg
S9B-180X195.1X6.3-AD1
180.0 mm
195.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0475 kg
S9B-180X200.5X8.1-AD1
180.0 mm
200.5 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0845 kg
S9B-185X205.5X8.1-AD1
185.0 mm
205.5 mm
8.1 mm
Polytetrafluoroethylene (PTFE 741)
0.0867 kg
S9B-18X25.3X3.2-AD1
18.0 mm
25.3 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0014 kg
S9B-25X32.5X3.2-AD1
25.0 mm
32.5 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0018 kg
S9B-28X39X4.2-AD1
28.0 mm
39.0 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0044 kg
S9B-32X42.7X4.2-AD1
32.0 mm
42.7 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0048 kg
PTB-67X77X6.6-J1S
67.0 mm
77.0 mm
6.6 mm
Polyurethane (TPU U-1003)
0.0077 kg
PTB-90X100X7.7-J1S
90.0 mm
100.0 mm
7.7 mm
Polyurethane (TPU U-1003)
0.0121 kg
PTB125-187-187-J1S
4.75 mm
11.1 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0004 kg
PTB125-750-178-J1S
19.05 mm
25.4 mm
4.97 mm
Polyurethane (TPU U-1003)
0.001 kg
PTB187-1500-290-J1S
38.1 mm
47.6 mm
8.1 mm
Polyurethane (TPU U-1003)
0.0052 kg
PTB187-3625-250-J1S
92.08 mm
101.57 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0287 kg
PTB218-1562-312-J1S
39.67 mm
50.75 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0077 kg
PTB250-13500-531-J1S
342.9 mm
355.6 mm
14.84 mm
Polyurethane (TPU U-1003)
0.105 kg
PTB250-13500-562-J1S
342.9 mm
355.6 mm
15.7 mm
Polyurethane (TPU U-1003)
0.112 kg
PTB250-437-375-J1S
11.1 mm
23.8 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0038 kg
PTB250-4875-562-J1S
123.83 mm
136.53 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0417 kg
PTB250-6750-375-J1S
171.45 mm
184.15 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0388 kg
PTB250-9000-562-J1S
228.6 mm
241.3 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0752 kg
PTB312-6625-625-J1S
168.28 mm
184.12 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0776 kg
PTB375-14375-625-J1S
365.13 mm
384.18 mm
17.46 mm
Polyurethane (TPU U-1003)
0.199 kg
PTB375-8500-500-J1S
215.9 mm
234.95 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0959 kg