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-105X120X11-J1S
105.0 mm
120.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0264 kg
PTB-10X20X8.8-J1S
10.0 mm
20.0 mm
8.8 mm
Polyurethane (TPU U-1003)
0.002 kg
PTB-110X130X16-J1S
110.0 mm
130.0 mm
16.0 mm
Polyurethane (TPU U-1003)
0.0338 kg
PTB-120X140X16-J1S
120.0 mm
140.0 mm
16.0 mm
Polyurethane (TPU U-1003)
0.0587 kg
PTB-135X155X16.5-J1S
135.0 mm
155.0 mm
16.5 mm
Polyurethane (TPU U-1003)
0.0211 kg
PTB-140X160X16.5-J1S
140.0 mm
160.0 mm
16.5 mm
Polyurethane (TPU U-1003)
0.0698 kg
PTB-160X180X16.5-J1S
160.0 mm
180.0 mm
16.5 mm
Polyurethane (TPU U-1003)
0.0859 kg
PTB-160X185X19.8-J1S
160.0 mm
185.0 mm
19.8 mm
Polyurethane (TPU U-1003)
0.115 kg
PTB-16X24X5.5-J1S
16.0 mm
24.0 mm
5.5 mm
Polyurethane (TPU U-1003)
0.0014 kg
PTB-180X205X16.5-J1S
180.0 mm
205.0 mm
16.5 mm
Polyurethane (TPU U-1003)
0.105 kg
PTB-18X25X5.1-J1S
18.0 mm
25.0 mm
5.1 mm
Polyurethane (TPU U-1003)
0.0012 kg
PTB-18X26X5.5-J1S
18.0 mm
26.0 mm
5.5 mm
Polyurethane (TPU U-1003)
0.0016 kg
PTB-190X210X13.2-J1S
190.0 mm
210.0 mm
13.2 mm
Polyurethane (TPU U-1003)
0.0696 kg
PTB-190X215X17.6-J1S
190.0 mm
215.0 mm
17.6 mm
Polyurethane (TPU U-1003)
0.119 kg
PTB-200X220X13.8-J1S
200.0 mm
220.0 mm
13.8 mm
Polyurethane (TPU U-1003)
0.0767 kg
PTB-20X30X6.6-J1S
20.0 mm
30.0 mm
6.6 mm
Polyurethane (TPU U-1003)
0.0026 kg
ZBR250-5250-562-E6W
133.35 mm
146.05 mm
15.7 mm
Polyurethane (TPU U-1029)
0.0468 kg
DZ-75X85X9.9-E2F
75.0 mm
85.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.0138 kg
DZ156-1500-312-E2F
38.1 mm
46.02 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0049 kg
DZ187-1000-312-E2F
25.4 mm
34.9 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0041 kg
DZ187-1125-312-E2F
28.58 mm
38.07 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0046 kg
DZ187-1187-312-E2F
30.15 mm
39.65 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0048 kg
DZ187-1500-312-E2F
38.1 mm
47.6 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0059 kg
DZ187-1500-375-E2F
38.1 mm
47.6 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0073 kg