Back-up rings

Seals Product Introduction

**Introduction to SKF Static Seals and Back-Up Rings: Engineered for Reliability and Performance**

In demanding industrial environments, preventing leaks and ensuring long-term sealing integrity are critical to maintaining equipment efficiency and reducing downtime. SKF, a global leader in sealing solutions, offers a comprehensive range of **static seals and back-up rings** designed to deliver exceptional performance in high-pressure, high-temperature, and chemically aggressive applications. These precision-engineered components are trusted across industries—from heavy machinery and automotive systems to hydraulic equipment and precision instruments—where reliability and durability are non-negotiable.

### **Technical Features and Design Excellence**
SKF static seals and back-up rings are manufactured using advanced materials and cutting-edge engineering to meet the toughest operational challenges. Key features include:

– **High-Performance Materials**: SKF utilizes premium elastomers (such as FKM, NBR, and EPDM) and thermoplastics tailored for specific conditions, ensuring resistance to extreme temperatures, hydraulic fluids, and corrosive media.
– **Optimized Geometry**: Precision-molded profiles ensure uniform compression and effective sealing, even in uneven or dynamic mating surfaces.
– **Back-Up Ring Support**: Reinforcing back-up rings prevent extrusion and deformation of primary seals under high-pressure conditions, extending service life.
– **Customization Options**: Available in a variety of sizes, hardness levels, and cross-sections to fit unique application requirements.

### **Performance Advantages**
SKF’s static seals and back-up rings are designed to outperform conventional solutions by addressing common failure modes such as extrusion, blow-out, and chemical degradation. Benefits include:

– **Enhanced Pressure Resistance**: Back-up rings stabilize primary seals, enabling reliable performance in systems exceeding 5,000 psi (350 bar).
– **Extended Service Intervals**: Reduced wear and leakage minimize maintenance needs, lowering total cost of ownership.
– **Broad Compatibility**: Suitable for use with oils, greases, water, and aggressive chemicals, making them ideal for diverse industrial and automotive applications.
– **Temperature Resilience**: Operates reliably in a range from -40°C to +200°C (-40°F to +392°F), depending on material selection.

### **Typical Applications**
SKF static seals and back-up rings are widely used in:

– **Hydraulic Systems**: Cylinders, pumps, and valves in construction, mining, and agricultural machinery.
– **Automotive Components**: Transmission systems, fuel injectors, and brake assemblies where high-pressure sealing is essential.
– **Industrial Machinery**: Presses, compressors, and turbines requiring robust sealing under cyclic loads.
– **Precision Equipment**: Aerospace and semiconductor manufacturing tools demanding contamination-free operation.

By combining material expertise with precision engineering, SKF’s static seals and back-up rings provide a dependable solution to sealing challenges—ensuring leak-free operation, reducing energy losses, and enhancing the longevity of critical equipment. For industries where failure is not an option, SKF delivers sealing solutions that stand the test of time.

*For specific technical specifications or application support, consult SKF’s engineering team or product catalog.*

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Designation O-ring inside diameter Width Dash-number Mass
STR 19-428-395A
123.19 mm
2.0 mm
428
0.0063 kg
STR 19-111-395A
10.77 mm
1.3 mm
111
0.0001 kg
STR 98X103X1.3-Y95A
98.0 mm
1.3 mm
0.0011 kg
STR 19-142-395A
59.99 mm
1.3 mm
142
0.0005 kg
STR 19-145-395A
64.77 mm
1.3 mm
145
0.0006 kg
STR 19-246-395A
113.89 mm
1.5 mm
246
0.0013 kg
STR 19-247-395A
117.07 mm
1.5 mm
247
0.0014 kg
STR 19-255-395A
142.47 mm
1.5 mm
255
0.0017 kg
STR 19-351-395A
120.02 mm
1.7 mm
351
0.0029 kg
STR 19-363-395A
164.47 mm
1.7 mm
363
0.0043 kg
STR 19-437-395A
151.77 mm
2.0 mm
437
0.0075 kg
STR 19-020-395A
21.95 mm
1.1 mm
020
0.0001 kg
STR 19-141-395A
58.42 mm
1.3 mm
141
0.0005 kg
STR 19-214-395A
24.99 mm
1.5 mm
214
0.0003 kg
STR 32X37X1.3-Y95A
31.2 mm
1.3 mm
0.0004 kg
STR 19-253-395A
136.12 mm
1.5 mm
253
0.0016 kg
STR 40X50X1.7-Y95A
39.2 mm
1.7 mm
0.0014 kg
STR 19-325-395A
37.47 mm
1.7 mm
325
0.0011 kg
STR 45X50X1.3-Y95A
44.2 mm
1.3 mm
0.0006 kg
STR 19-327-395A
43.82 mm
1.7 mm
327
0.0013 kg