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
PTB500-3000-750-J1S
76.2 mm
101.6 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0757 kg
PTB375-5125-625-J1S
130.18 mm
149.23 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0742 kg
PTB500-4000-750-J1S
101.6 mm
127.0 mm
20.96 mm
Polyurethane (TPU U-1003)
0.0973 kg
PTB375-5375-625-J1S
136.53 mm
155.58 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0776 kg
PTB500-5000-750-J1S
127.0 mm
152.4 mm
20.96 mm
Polyurethane (TPU U-1003)
0.119 kg
PTB375-5875-625-J1S
149.23 mm
168.28 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0843 kg
PTB375-6500-500-J1S
165.1 mm
184.15 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0743 kg
PTB375-7000-500-J1S
177.8 mm
196.85 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0797 kg
PTB312-4375-562-J1S
111.13 mm
126.97 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0471 kg
PTB312-4625-625-J1S
117.48 mm
133.32 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0552 kg
PTB312-4750-500-J1S
120.65 mm
136.5 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0453 kg
PTB312-7250-625-J1S
184.15 mm
200.0 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0845 kg
PTB375-10000-625-J1S
254.0 mm
273.05 mm
17.46 mm
Polyurethane (TPU U-1003)
0.14 kg
PTB250-9500-562-J1S
241.3 mm
254.0 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0793 kg
PTB375-10250-500-J1S
260.35 mm
279.4 mm
13.97 mm
Polyurethane (TPU U-1003)
0.115 kg
PTB312-1375-500-J1S
34.93 mm
50.77 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0151 kg
PTB375-11250-625-J1S
285.75 mm
304.8 mm
17.46 mm
Polyurethane (TPU U-1003)
0.157 kg
PTB312-1625-375-J1S
41.28 mm
57.12 mm
10.48 mm
Polyurethane (TPU U-1003)
0.013 kg
PTB375-2875-500-J1S
73.03 mm
92.08 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0351 kg
PTB312-1750-500-J1S
44.45 mm
60.3 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0184 kg
PTB375-3000-500-J1S
76.2 mm
95.25 mm
13.97 mm
Polyurethane (TPU U-1003)
0.104 kg
PTB312-2250-500-J1S
57.15 mm
73.0 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0228 kg
PTB312-2500-500-J1S
63.5 mm
79.35 mm
13.97 mm
Polyurethane (TPU U-1003)
0.025 kg
PTB312-3000-500-J1S
76.2 mm
92.05 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0296 kg