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
PTB-36X52X11-J1S
36.0 mm
52.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0119 kg
PTB-37X47X5.5-J1S
37.0 mm
47.0 mm
5.5 mm
Polyurethane (TPU U-1003)
0.0075 kg
PTB-50X70X11-J1S
50.0 mm
70.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0167 kg
PTB-75X83X6.6-J1S
75.0 mm
83.0 mm
6.6 mm
Polyurethane (TPU U-1003)
0.0068 kg
PTB-82X92X11-J1S
82.0 mm
92.0 mm
11.0 mm
Polyurethane (TPU U-1003)
0.0138 kg
DZ250-375-375-E2F
9.53 mm
22.23 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.004 kg
DZ250-5500-375-E2F
139.7 mm
152.4 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.04 kg
DZ250-6375-500-E2F
161.93 mm
174.63 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0391 kg
DZ250-6500-375-E2F
165.1 mm
177.8 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0417 kg
DZ250-6500-562-E2F
165.1 mm
177.8 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0534 kg
DZ250-7000-375-E2F
177.8 mm
190.5 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0448 kg
DZ312-3750-375-E2F
95.25 mm
111.1 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0331 kg
DZ312-8875-500-E2F
225.43 mm
241.27 mm
13.97 mm
Nitrile Rubber (NBR A-8504)
0.0921 kg
DZ375-10000-625-E2F
254.0 mm
273.05 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.144 kg
DZ375-1250-625-E2F
31.75 mm
50.8 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.022 kg
DZ375-1750-375-E2F
44.45 mm
63.5 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.016 kg
DZ375-3625-875-E2F
92.08 mm
111.13 mm
24.45 mm
Nitrile Rubber (NBR A-8504)
0.0755 kg
DZ375-4500-750-E2F
114.3 mm
133.35 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.0789 kg
DZ375-9000-625-E2F
228.6 mm
247.65 mm
17.46 mm
Nitrile Rubber (NBR A-8504)
0.129 kg
DZ375-9250-562-E2F
234.95 mm
254.0 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.13 kg
DZ500-4000-750-E2F
101.6 mm
127.0 mm
20.96 mm
Nitrile Rubber (NBR A-8504)
0.11 kg
DZR187-3000-375-E2D
76.2 mm
85.7 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0137 kg
DZR250-2750-375-E2E
69.85 mm
82.55 mm
10.48 mm
Nitrile Rubber (NBR A-8504)
0.0185 kg
DZR312-4000-562-E2E
101.6 mm
117.45 mm
15.7 mm
Nitrile Rubber (NBR A-8504)
0.0413 kg