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-170X185X9.9-J1S
170.0 mm
185.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.037 kg
PTB-180X205X17.6-J1S
180.0 mm
205.0 mm
17.6 mm
Polyurethane (TPU U-1003)
0.0862 kg
PTB-199X224X17.6-J1S
199.0 mm
224.0 mm
17.6 mm
Polyurethane (TPU U-1003)
0.12 kg
PTB-20X32X8.8-J1S
20.0 mm
32.0 mm
8.8 mm
Polyurethane (TPU U-1003)
0.0044 kg
PTB-225X255X24.8-J1S
225.0 mm
255.0 mm
24.8 mm
Polyurethane (TPU U-1003)
0.254 kg
PTB-230X250X13.8-J1S
230.0 mm
250.0 mm
13.8 mm
Polyurethane (TPU U-1003)
0.0877 kg
PTB-280X305X17.6-J1S
280.0 mm
305.0 mm
17.6 mm
Polyurethane (TPU U-1003)
0.22 kg
PTB-32X44X6.1-J1S
32.0 mm
44.0 mm
6.1 mm
Polyurethane (TPU U-1003)
0.0047 kg
DZ250-3125-375-E2F
79.38 mm
92.08 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0209 kg
DZ250-4250-375-E2F
107.95 mm
120.65 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0278 kg
DZ250-5000-375-E2F
127.0 mm
139.7 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0325 kg
DZ250-5750-375-E2F
146.05 mm
158.75 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.038 kg
DZ250-7250-500-E2F
184.15 mm
196.85 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0422 kg
DZ250-8125-500-E2F
206.38 mm
219.08 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0694 kg
DZ312-2250-500-E2F
57.15 mm
73.0 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0241 kg
DZ312-2750-500-E2F
69.85 mm
85.7 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0297 kg
DZ312-3250-500-E2F
82.55 mm
98.4 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0356 kg
DZ312-3375-500-E2F
85.73 mm
101.57 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0481 kg
DZ312-4250-562-E2F
107.95 mm
123.8 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0502 kg
DZ375-10500-625-E2F
266.7 mm
285.75 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.15 kg
DZ375-2750-625-E2F
69.85 mm
88.9 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0423 kg
DZ375-4250-625-E2F
107.95 mm
127.0 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0613 kg
DZ375-4500-625-E2F
114.3 mm
133.35 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0625 kg
DZ375-7250-625-E2F
184.15 mm
203.2 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0965 kg