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
PTB250-12750-562-J1S
323.85 mm
336.55 mm
15.7 mm
Polyurethane (TPU U-1003)
0.106 kg
PTB250-1375-312-J1S
34.93 mm
47.63 mm
8.72 mm
Polyurethane (TPU U-1003)
0.009 kg
PTB250-5875-562-J1S
149.23 mm
161.93 mm
15.7 mm
Polyurethane (TPU U-1003)
0.0498 kg
PTB250-6875-625-J1S
174.63 mm
187.33 mm
17.46 mm
Polyurethane (TPU U-1003)
0.0596 kg
PTB250-7250-562-J1S
184.15 mm
196.85 mm
15.7 mm
Polyurethane (TPU U-1003)
0.061 kg
PTB312-3625-375-J1S
92.08 mm
107.92 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0264 kg
PTB312-4125-500-J1S
104.78 mm
120.62 mm
13.97 mm
Polyurethane (TPU U-1003)
0.0395 kg
PTB375-3250-562-J1S
82.55 mm
101.6 mm
15.7 mm
Polyurethane (TPU U-1003)
0.044 kg
PTB375-35000-625-J1S
889.0 mm
908.05 mm
17.46 mm
Polyurethane (TPU U-1003)
0.477 kg
DZR375-7875-625-E2D
200.03 mm
219.08 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.114 kg
DZR500-8000-750-E2E
203.2 mm
228.6 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.212 kg
DZR500-8500-750-E2E
215.9 mm
241.3 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.214 kg
PTB-12.5X22.5X8.8-J1S
12.5 mm
22.5 mm
8.8 mm
Polyurethane (TPU U-1003)
0.0027 kg
PTB-12X22X8-J1S
12.0 mm
22.0 mm
8.0 mm
Polyurethane (TPU U-1003)
0.0017 kg
PTB-140X160X14.3-J1S
140.0 mm
160.0 mm
14.3 mm
Polyurethane (TPU U-1003)
0.0575 kg
PTB-14X24X8.8-J1S
14.0 mm
24.0 mm
8.8 mm
Polyurethane (TPU U-1003)
0.0027 kg
PTB-165X190X17.6-J1S
165.0 mm
190.0 mm
17.6 mm
Polyurethane (TPU U-1003)
0.104 kg
PTB-175X185X12.5-J1S
175.0 mm
185.0 mm
12.5 mm
Polyurethane (TPU U-1003)
0.0361 kg
PTB-175X200X19.8-J1S
175.0 mm
200.0 mm
19.8 mm
Polyurethane (TPU U-1003)
0.121 kg
PTB-236X261X20.9-J1S
236.0 mm
261.0 mm
20.9 mm
Polyurethane (TPU U-1003)
0.183 kg
PTB-270X300X20.9-J1S
270.0 mm
300.0 mm
20.9 mm
Polyurethane (TPU U-1003)
0.25 kg
PTB-28X40X6.6-J1S
28.0 mm
40.0 mm
6.6 mm
Polyurethane (TPU U-1003)
0.0043 kg
PTB-300X330X38.5-J1S
300.0 mm
330.0 mm
38.5 mm
Polyurethane (TPU U-1003)
0.54 kg
PTB-35X55X11-J1S
35.0 mm
55.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0304 kg