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
ZBR250-5000-375-E6W
127.0 mm
139.7 mm
10.48 mm
Polyurethane (TPU U-1029)
0.0293 kg
DZ-100X115X13.2-E2F
100.0 mm
115.0 mm
13.2 mm
Polyurethane (TPU U-1003)
0.0369 kg
DZ-30X40X9.9-E2F
30.0 mm
40.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.0065 kg
DZ-55X65X9.9-E2F
55.0 mm
65.0 mm
9.9 mm
Polyurethane (TPU U-1003)
0.0104 kg
DZ-85X100X13.8-E2F
85.0 mm
100.0 mm
13.8 mm
Polyurethane (TPU U-1003)
0.0306 kg
DZ125-1375-312-E2F
34.93 mm
41.28 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0029 kg
DZ125-500-250-E2F
12.7 mm
19.05 mm
6.99 mm
Nitrile Rubber (NBR A-8504)
0.0009 kg
DZ187-1875-312-E2F
47.63 mm
57.12 mm
8.72 mm
Nitrile Rubber (NBR A-8504)
0.0072 kg
DZ187-2125-375-E2F
53.98 mm
63.47 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0119 kg
DZ187-2250-375-E2F
57.15 mm
66.65 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.01 kg
DZ250-1250-562-E2F
31.75 mm
44.45 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0119 kg
DZ250-2000-562-E2F
50.8 mm
63.5 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0178 kg
DZ250-5250-562-E2F
133.35 mm
146.05 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0484 kg
DZ250-6000-375-E2F
152.4 mm
165.1 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0386 kg
DZ250-8125-375-E2F
206.38 mm
219.08 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0518 kg
DZ312-3000-500-E2F
76.2 mm
92.05 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0332 kg
DZ375-10750-625-E2F
273.05 mm
292.1 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.153 kg
DZ375-3625-625-E2F
92.08 mm
111.13 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0551 kg
DZ375-3750-625-E2F
95.25 mm
114.3 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0568 kg
DZ375-7750-500-E2F
196.85 mm
215.9 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.111 kg
ZBR-160X185X19.7-E6W
160.0 mm
185.0 mm
19.7 mm
Polyurethane (TPU U-1029)
0.129 kg
ZBR-18X26X5.7-E6W
18.0 mm
26.0 mm
5.7 mm
Polyurethane (TPU U-1029)
0.0016 kg
ZBR-240X260X16.5-E6W
240.0 mm
260.0 mm
16.5 mm
Polyurethane (TPU U-1029)
0.137 kg
ZBR-30X40X7-E6W
30.0 mm
40.0 mm
7.0 mm
Polyurethane (TPU U-1029)
0.0039 kg