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 19-154-395A
94.92 mm
1.3 mm
154
0.0007 kg
STR 19-320-395A
27.94 mm
1.7 mm
320
0.0009 kg
STR 170X180X1.7-Y95A
169.3 mm
1.7 mm
0.0056 kg
STR 17X21X1.3-Y95A
18.3 mm
1.3 mm
0.0001 kg
STR 19-021-395A
23.52 mm
1.1 mm
021
0.0001 kg
STR 19-022-395A
25.12 mm
1.1 mm
022
0.0001 kg
STR 19-025-395A
29.87 mm
1.1 mm
025
0.0002 kg
STR 19-037-395A
63.22 mm
1.1 mm
037
0.0003 kg
STR 19-040-395A
72.75 mm
1.1 mm
040
0.0004 kg
STR 19-117-395A
20.29 mm
1.3 mm
117
0.0002 kg
STR 100X105X1.3-Y95A
99.5 mm
1.3 mm
0.0013 kg
STR 19-120-395A
25.07 mm
1.3 mm
120
0.0002 kg
STR 110X120X1.7-Y95A
109.1 mm
1.7 mm
0.0037 kg
STR 19-123-395A
29.82 mm
1.3 mm
123
0.0002 kg
STR 11X15X1.3-Y95A
10.3 mm
1.3 mm
0.0001 kg
STR 19-127-395A
36.17 mm
1.3 mm
127
0.0003 kg
STR 120X125X1.3-Y95A
119.5 mm
1.3 mm
0.0014 kg
STR 19-128-395A
37.77 mm
1.3 mm
128
0.0003 kg
STR 150X160X1.7-Y95A
149.3 mm
1.7 mm
0.0049 kg
STR 155X165X1.7-Y95A
154.3 mm
1.7 mm
0.0048 kg