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
STD625-8500-625-J1S
215.9 mm
247.65 mm
17.46 mm
Polyurethane (TPU U-1003)
0.21 kg
S9B1-1750-AD1
44.45 mm
52.02 mm
3.2 mm
Polytetrafluoroethylene (PTFE 741)
0.003 kg
S9B3-4250-AD1
107.95 mm
123.6 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0286 kg
S9B3-6000-AD1
152.4 mm
168.05 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.04 kg
S9B3-7250-AD1
184.15 mm
199.8 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.048 kg
S9B3-7500-AD1
190.5 mm
206.15 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0497 kg
S9B4-6750-AD1
171.45 mm
192.53 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.0802 kg
S9B4-7250-AD1
184.15 mm
205.23 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.0851 kg
S9B4-7750-AD1
196.85 mm
217.93 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.0908 kg
S9B4-8500-AD1
215.9 mm
236.98 mm
8.13 mm
Polytetrafluoroethylene (PTFE 741)
0.0984 kg
STD125-2875-125-J1S
73.03 mm
79.38 mm
3.49 mm
Polyurethane (TPU U-1003)
0.0025 kg
STD125-3125-125-J1S
79.38 mm
85.73 mm
3.49 mm
Polyurethane (TPU U-1003)
0.003 kg
STD187-250-187-J1S
6.35 mm
15.85 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0031 kg
STD187-312-187-J1S
7.92 mm
17.42 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0036 kg
STD187-812-187-J1S
20.62 mm
30.12 mm
5.22 mm
Polyurethane (TPU U-1003)
0.007 kg
STD187-937-187-J1S
23.8 mm
33.3 mm
5.22 mm
Polyurethane (TPU U-1003)
0.0079 kg
STD250-687-250-J1S
17.45 mm
30.15 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0035 kg
STD250-9250-250-J1S
234.95 mm
247.65 mm
6.99 mm
Polyurethane (TPU U-1003)
0.0357 kg
STD312-1125-312-J1S
28.58 mm
44.42 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0083 kg
STD312-1687-312-J1S
42.85 mm
58.7 mm
8.72 mm
Polyurethane (TPU U-1003)
0.0115 kg
STD312-375-312-J1S
9.53 mm
25.37 mm
8.72 mm
Polyurethane (TPU U-1003)
0.004 kg
RSB2-1750-AD2
44.45 mm
55.22 mm
4.22 mm
Polytetrafluoroethylene (PTFE 741)
0.0229 kg
RSB3-2750-AD2
69.85 mm
85.5 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.0577 kg
RSB3-7000-AD2
177.8 mm
193.45 mm
6.27 mm
Polytetrafluoroethylene (PTFE 741)
0.173 kg