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
DZ250-1500-562-E2F
38.1 mm
50.8 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0139 kg
DZ250-2375-375-E2F
60.33 mm
73.03 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0162 kg
DZ250-2875-375-E2F
73.03 mm
85.73 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0193 kg
DZ250-6750-562-E2F
171.45 mm
184.15 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0561 kg
DZ250-7250-375-E2F
184.15 mm
196.85 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0459 kg
DZ312-7250-500-E2F
184.15 mm
200.0 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.109 kg
DZ375-11000-625-E2F
279.4 mm
298.45 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.157 kg
DZ375-2500-625-E2F
63.5 mm
82.55 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.0396 kg
DZ375-3000-875-E2F
76.2 mm
95.25 mm
24.45 mm
Nitrile Rubber (NBR A-8504)
0.0637 kg
STD750-36000-750-J1S
914.4 mm
952.5 mm
20.96 mm
Polyurethane (TPU U-1003)
1.25 kg
STD750-5000-750-J1S
127.0 mm
165.1 mm
20.96 mm
Polyurethane (TPU U-1003)
0.196 kg
STD750-7000-750-J1S
177.8 mm
215.9 mm
20.96 mm
Polyurethane (TPU U-1003)
0.265 kg
ZBR-105X125X13-E6W
105.0 mm
125.0 mm
13.0 mm
Polyurethane (TPU U-1029)
0.0684 kg
ZBR-110X130X11-E6W
110.0 mm
130.0 mm
11.0 mm
Polyurethane (TPU U-1029)
0.0709 kg
ZBR-130X145X11-E6W
130.0 mm
145.0 mm
11.0 mm
Polyurethane (TPU U-1029)
0.005 kg
ZBR-130X145X12-E6W
130.0 mm
145.0 mm
12.0 mm
Polyurethane (TPU U-1029)
0.0438 kg
ZBR-130X150X13-E6W
130.0 mm
150.0 mm
13.0 mm
Polyurethane (TPU U-1029)
0.005 kg
ZBR-210X230X16.5-E6W
210.0 mm
230.0 mm
16.5 mm
Polyurethane (TPU U-1029)
0.075 kg
ZBR-55X70X10-E6W
55.0 mm
70.0 mm
10.0 mm
Polyurethane (TPU U-1029)
0.0148 kg
ZBR-63X78X13.5-E6W
63.0 mm
78.0 mm
13.5 mm
Polyurethane (TPU U-1029)
0.0285 kg
ZBR-70X83X11-E6W
70.0 mm
83.0 mm
11.0 mm
Polyurethane (TPU U-1029)
0.0173 kg
ZBR125-1125-187-E6W
28.58 mm
34.93 mm
5.22 mm
Polyurethane (TPU U-1029)
0.0016 kg
ZBR125-1500-250-E6W
38.1 mm
44.45 mm
6.99 mm
Polyurethane (TPU U-1029)
0.0028 kg
ZBR187-1500-295-E6W
38.1 mm
47.6 mm
8.24 mm
Polyurethane (TPU U-1029)
0.005 kg