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-112X125X7.7-J1S
112.0 mm
125.0 mm
7.7 mm
Polyurethane (TPU U-1003)
0.0147 kg
DZ375-8000-625-E2F
203.2 mm
222.25 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.115 kg
PTB-12X20X5.5-J1S
12.0 mm
20.0 mm
5.5 mm
Polyurethane (TPU U-1003)
0.0011 kg
DZ500-11000-750-E2F
279.4 mm
304.8 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.28 kg
PTB-12X22X8.8-J1S
12.0 mm
22.0 mm
8.8 mm
Polyurethane (TPU U-1003)
0.0024 kg
DZ500-8500-750-E2F
215.9 mm
241.3 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.219 kg
DZR-40X50X8-E2E
40.0 mm
50.0 mm
8.0 mm
Polyurethane (TPU U-1003)
0.0076 kg
DZR-56X71X11.7-E2E
56.0 mm
71.0 mm
11.7 mm
Polyurethane (TPU U-1003)
0.024 kg
DZR250-3875-375-E2D
98.43 mm
111.13 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0226 kg
DZR375-4250-625-E2E
107.95 mm
127.0 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0687 kg
DZR375-5000-625-E2E
127.0 mm
146.05 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.079 kg
DZR375-6000-625-E2E
152.4 mm
171.45 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.101 kg
DZR375-7500-625-E2D
190.5 mm
209.55 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.112 kg
ZBR312-3750-500-E6W
95.25 mm
111.1 mm
13.97 mm
Polyurethane (TPU U-1029)
0.036 kg
DZ312-7250-500-E2F
184.15 mm
200.0 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.109 kg
ZBR375-5500-625-E6W
139.7 mm
158.75 mm
17.46 mm
Polyurethane (TPU U-1029)
0.0796 kg
DZ375-11000-625-E2F
279.4 mm
298.45 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.157 kg
DZ-105X120X13.2-E2F
105.0 mm
120.0 mm
13.2 mm
Polyurethane (TPU U-1003)
0.0387 kg
DZ375-2500-625-E2F
63.5 mm
82.55 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0396 kg
DZ-25X33X7.2-E2F
25.0 mm
33.0 mm
7.2 mm
Polyurethane (TPU U-1003)
0.0033 kg
DZ375-3000-875-E2F
76.2 mm
95.25 mm
24.45 mm
Nitrile Rubber (NBR A-8504)
0.0637 kg
DZ-40X50X8-E2F
40.0 mm
50.0 mm
8.0 mm
Polyurethane (TPU U-1003)
0.0071 kg
DZ-60X70X9.9-E2F
60.0 mm
70.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.0112 kg
DZ-80X90X9.9-E2F
80.0 mm
90.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.0146 kg