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 19-167-395A
177.47 mm
1.3 mm
167
0.0015 kg
STR 19-206-395A
12.29 mm
1.5 mm
206
0.0002 kg
STR 175X180X1.3-Y95A
174.0 mm
1.3 mm
0.0233 kg
STR 18X22X1.3-Y95A
17.3 mm
1.3 mm
0.0001 kg
STR 19-027-395A
33.05 mm
1.1 mm
027
0.0002 kg
STR 19-034-395A
53.7 mm
1.1 mm
034
0.0004 kg
STR 19-050-395A
133.07 mm
1.1 mm
050
0.0008 kg
STR 19-118-395A
21.89 mm
1.3 mm
118
0.0002 kg
STR 70X80X1.7-Y95A
69.2 mm
1.7 mm
0.002 kg
STR 19-126-395A
34.59 mm
1.3 mm
126
0.0003 kg
STR 105X115X1.7-Y95A
104.1 mm
1.7 mm
0.0035 kg
STR 19-132-395A
44.12 mm
1.3 mm
132
0.0004 kg
STR 110X115X1.3-Y95A
109.5 mm
1.3 mm
0.001 kg
STR 19-136-395A
50.47 mm
1.3 mm
136
0.0005 kg
STR 125X135X1.7-Y95A
124.3 mm
1.7 mm
0.0038 kg
STR 19-139-395A
55.25 mm
1.3 mm
139
0.0005 kg
STR 130X140X1.7-Y95A
129.3 mm
1.7 mm
0.004 kg
STR 135X145X1.7-Y95A
134.3 mm
1.7 mm
0.0044 kg
STR 140X150X1.7-Y95A
139.3 mm
1.7 mm
0.0041 kg
STR 145X150X1.3-Y95A
144.5 mm
1.3 mm
0.0015 kg