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
STD375-5750-375-J1S
146.05 mm
165.1 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0525 kg
STD375-8000-375-J1S
203.2 mm
222.25 mm
10.48 mm
Polyurethane (TPU U-1003)
0.0718 kg
STD437-4500-437-J1S
114.3 mm
136.5 mm
12.21 mm
Polyurethane (TPU U-1003)
0.154 kg
STD437-5125-437-J1S
130.18 mm
152.37 mm
12.21 mm
Polyurethane (TPU U-1003)
0.0641 kg
STD500-11000-500-J1S
279.4 mm
304.8 mm
13.97 mm
Polyurethane (TPU U-1003)
0.173 kg
STD500-13000-500-J1S
330.2 mm
355.6 mm
13.97 mm
Polyurethane (TPU U-1003)
0.202 kg
STD500-18000-500-J1S
457.2 mm
482.6 mm
13.97 mm
Polyurethane (TPU U-1003)
0.277 kg
STD500-20000-500-J1S
508.0 mm
533.4 mm
13.97 mm
Polyurethane (TPU U-1003)
0.307 kg
STD187-1062-187-J1S
26.97 mm
36.47 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0087 kg
STD187-1187-187-J1S
30.15 mm
39.65 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0096 kg
STD187-1375-187-J1S
34.93 mm
44.42 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0109 kg
STD187-1687-187-J1S
42.85 mm
52.35 mm
5.22 mm
Polyurethane (TPU U-1003)
0.004 kg
STD187-3250-187-J1S
82.55 mm
92.05 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0231 kg
STD187-3875-187-J1S
98.43 mm
107.92 mm
5.22 mm
Polyurethane (TPU U-1003)
0.028 kg
STD187-4375-187-J1S
111.13 mm
120.62 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0315 kg
STD187-4625-187-J1S
117.48 mm
126.97 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0103 kg
STD187-5000-187-J1S
127.0 mm
136.5 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0111 kg
STD187-875-187-J1S
22.23 mm
31.72 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0074 kg
STD218-3000-218-J1S
76.2 mm
87.27 mm
6.09 mm
Polyurethane (TPU U-1003)
0.0091 kg
STD250-11250-250-J1S
285.75 mm
298.45 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0432 kg
STD250-1437-250-J1S
36.5 mm
49.2 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0063 kg
STD250-1500-250-J1S
38.1 mm
50.8 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0065 kg
STD250-1750-250-J1S
44.45 mm
57.15 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0075 kg
STD250-3750-250-J1S
95.25 mm
107.95 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0149 kg