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
STD187-3000-187-J1S
76.2 mm
85.7 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0214 kg
STD187-3125-187-J1S
79.38 mm
88.87 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0229 kg
STD187-4750-187-J1S
120.65 mm
130.15 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0105 kg
STD187-687-187-J1S
17.45 mm
26.95 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0019 kg
STD218-2812-218-J1S
71.42 mm
82.5 mm
6.09 mm
Polyurethane (TPU U-1003)
0.0085 kg
STD250-1000-250-J1S
25.4 mm
38.1 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0047 kg
STD250-1187-250-J1S
30.15 mm
42.85 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0054 kg
STD250-1250-250-J1S
31.75 mm
44.45 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0056 kg
SIL 35X50X11
35.0 mm
50.0 mm
11.0 mm
B93
0.0094 kg
SIL 36X44X7
36.0 mm
44.0 mm
7.0 mm
B93
0.003 kg
SIL 45X55X8
45.0 mm
55.0 mm
8.0 mm
B93
0.006 kg
SIL 50X60X11
50.0 mm
60.0 mm
11.0 mm
B93
0.0095 kg
SIL 56X71X12.5
56.0 mm
71.0 mm
12.5 mm
B93
0.017 kg
SIL 63X73X13
63.0 mm
73.0 mm
13.0 mm
B93
0.0124 kg
SIL 63X73X7
63.0 mm
73.0 mm
7.0 mm
B93
0.007 kg
SIL 63X78X11
63.0 mm
78.0 mm
11.0 mm
B93
0.018 kg
SIL 70X80X12.5
70.0 mm
80.0 mm
12.5 mm
B93
0.0145 kg
SIL 70X85X11
70.0 mm
85.0 mm
11.0 mm
B93
0.019 kg
SIL 80X100X13
80.0 mm
100.0 mm
13.0 mm
B93
0.0334 kg
SIL 80X100X16
80.0 mm
100.0 mm
16.0 mm
B93
0.043 kg
SIL 80X88X12.5
80.0 mm
88.0 mm
12.5 mm
B93
0.0119 kg
SIL 80X90X11
80.0 mm
90.0 mm
11.0 mm
B93
0.014 kg
SIL 80X95X12.5
80.0 mm
95.0 mm
12.5 mm
B93
0.0221 kg
SIL 90X110X13
90.0 mm
110.0 mm
13.0 mm
B93
0.0348 kg