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
PTB-95X115X13.2-J1S
95.0 mm
115.0 mm
13.2 mm
Polyurethane (TPU U-1003)
0.0356 kg
PTB125-1312-187-J1S
33.32 mm
39.67 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0018 kg
PTB125-1750-250-J1S
44.45 mm
50.8 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0033 kg
PTB125-2375-187-J1S
60.33 mm
66.68 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0031 kg
PTB125-250-250-J1S
6.35 mm
12.7 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0007 kg
PTB125-375-250-J1S
9.53 mm
15.88 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0009 kg
PTB125-750-187-J1S
19.05 mm
25.4 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0011 kg
PTB125-875-250-J1S
22.23 mm
28.58 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0018 kg
PTB156-1500-312-J1S
38.1 mm
46.02 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0047 kg
PTB187-1000-375-J1S
25.4 mm
34.9 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0106 kg
PTB187-1250-250-J1S
31.75 mm
41.25 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0109 kg
PTB187-1375-250-J1S
34.93 mm
44.42 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0118 kg
PTB187-1437-312-J1S
36.5 mm
46.0 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0134 kg
PTB187-1500-375-J1S
38.1 mm
47.6 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0067 kg
PTB187-1562-375-J1S
39.67 mm
49.17 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0156 kg
PTB187-1625-250-J1S
41.28 mm
50.77 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0137 kg
PTB187-1625-312-J1S
41.28 mm
50.77 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0149 kg
PTB187-2000-250-J1S
50.8 mm
60.3 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0165 kg
PTB187-2375-375-J1S
60.33 mm
69.82 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0227 kg
PTB187-2500-250-J1S
63.5 mm
73.0 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0202 kg
PTB-55X68X11-J1S
55.0 mm
68.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0137 kg
PTB-56X64X8.8-J1S
56.0 mm
64.0 mm
8.8 mm
Polyurethane (TPU U-1003)
0.0066 kg
PTB-56X66X11-J1S
56.0 mm
66.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0108 kg
PTB-60X70X13.2-J1S
60.0 mm
70.0 mm
13.2 mm
Polyurethane (TPU U-1003)
0.0136 kg