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
STD187-1312-187-J1S
33.32 mm
42.82 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0032 kg
STD187-5500-187-J1S
139.7 mm
149.2 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0121 kg
STD218-2500-218-J1S
63.5 mm
74.57 mm
6.09 mm
Polyurethane (TPU U-1003)
0.0077 kg
STD250-10750-250-J1S
273.05 mm
285.75 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0414 kg
STD250-1094-250-J1S
27.79 mm
40.49 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0051 kg
STD250-14250-250-J1S
361.95 mm
374.65 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0545 kg
STD250-2437-250-J1S
61.9 mm
74.6 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0101 kg
STD250-8125-250-J1S
206.38 mm
219.08 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0315 kg
STD312-1437-312-J1S
36.5 mm
52.35 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0101 kg
STD312-2125-312-J1S
53.98 mm
69.82 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0141 kg
STD312-437-312-J1S
11.1 mm
26.95 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0043 kg
STD312-6125-312-J1S
155.58 mm
171.42 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0373 kg
STD312-8875-312-J1S
225.43 mm
241.27 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0532 kg
RSB4-6000-AD2
152.4 mm
173.48 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.261 kg
S9B-150X165.1X6.3-AD1
150.0 mm
165.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0397 kg
S9B-167X182.5X6.3-AD1
167.0 mm
182.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.01 kg
S9B-177X192.5X6.3-AD1
177.0 mm
192.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0886 kg
S9B-180X195.5X6.3-AD1
180.0 mm
195.5 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0483 kg
S9B-18X25.5X3.2-AD1
18.0 mm
25.5 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0014 kg
S9B-200X215.1X6.3-AD1
200.0 mm
215.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0338 kg
S9B-20X30.7X4.2-AD1
20.0 mm
30.7 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0033 kg
S9B-35X45.7X4.2-AD1
35.0 mm
45.7 mm
4.2 mm
Polytetrafluoroethylene (PTFE 741)
0.0051 kg
S9B-56X71.1X6.3-AD1
56.0 mm
71.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0158 kg
S9B-95X110.1X6.3-AD1
95.0 mm
110.1 mm
6.3 mm
Polytetrafluoroethylene (PTFE 741)
0.0168 kg