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
STD375-13750-375-J1S
349.25 mm
368.3 mm
10.48 mm
Polyurethane (TPU U-1003)
0.121 kg
STD375-1500-375-J1S
38.1 mm
57.15 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0161 kg
STD375-1562-375-J1S
39.67 mm
58.72 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0546 kg
STD375-2250-375-J1S
57.15 mm
76.2 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0754 kg
STD375-2500-375-J1S
63.5 mm
82.55 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0825 kg
STD375-3375-375-J1S
85.73 mm
104.78 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0322 kg
STD375-4000-375-J1S
101.6 mm
120.65 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0375 kg
STD375-4375-375-J1S
111.13 mm
130.18 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0407 kg
STD375-5000-375-J1S
127.0 mm
146.05 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0461 kg
STD375-5375-375-J1S
136.53 mm
155.58 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0493 kg
STD375-6250-375-J1S
158.75 mm
177.8 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0568 kg
STD375-7750-375-J1S
196.85 mm
215.9 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0697 kg
STD375-9250-375-J1S
234.95 mm
254.0 mm
10.48 mm
Polyurethane (TPU U-1003)
0.06 kg
STD437-2500-437-J1S
63.5 mm
85.7 mm
12.21 mm
Polyurethane (TPU U-1003)
0.0338 kg
STD437-5250-437-J1S
133.35 mm
155.55 mm
12.21 mm
Polyurethane (TPU U-1003)
0.0655 kg
STD500-10500-500-J1S
266.7 mm
292.1 mm
13.97 mm
Polyurethane (TPU U-1003)
0.165 kg
STD250-13500-250-J1S
342.9 mm
355.6 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0517 kg
STD250-1625-250-J1S
41.28 mm
53.98 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0071 kg
STD250-1875-250-J1S
47.63 mm
60.33 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0079 kg
STD250-2125-250-J1S
53.98 mm
66.68 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0089 kg
STD250-2375-250-J1S
60.33 mm
73.03 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0098 kg
STD250-2562-250-J1S
65.07 mm
77.77 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0105 kg
STD250-3625-250-J1S
92.08 mm
104.78 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0144 kg
STD250-4125-250-J1S
104.78 mm
117.48 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0163 kg