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 145X155X1.7-Y95A
144.3 mm
1.7 mm
0.0045 kg
STR 175X185X1.7-Y95A
174.3 mm
1.7 mm
0.0054 kg
STR 43X48X1.3-Y95A
42.2 mm
1.3 mm
0.0005 kg
STR 45X55X1.7-Y95A
44.2 mm
1.7 mm
0.0015 kg
STR 19-333-395A
62.87 mm
1.7 mm
333
0.0017 kg
STR 68X73X1.3-Y95A
67.0 mm
1.3 mm
0.0008 kg
STR 19-334-395A
66.04 mm
1.7 mm
334
0.0018 kg
STR 69X74X1.3-Y95A
68.0 mm
1.3 mm
0.0008 kg
STR 19-338-395A
78.74 mm
1.7 mm
338
0.002 kg
STR 70X75X1.3-Y95A
69.5 mm
1.3 mm
0.0008 kg
STR 19-355-395A
132.72 mm
1.7 mm
355
0.0033 kg
STR 75X85X1.7-Y95A
74.2 mm
1.7 mm
0.0024 kg
STR 19-359-395A
145.42 mm
1.7 mm
359
0.0037 kg
STR 19-362-395A
158.12 mm
1.7 mm
362
0.004 kg
STR 19-365-395A
177.17 mm
1.7 mm
365
0.0045 kg
STR 19-432-395A
135.89 mm
2.0 mm
432
0.0068 kg
STR 19-444-395A
196.22 mm
2.0 mm
444
0.0096 kg
STR 19-448-395A
240.67 mm
2.0 mm
448
0.0112 kg
STR 250X260X1.7-Y95A
249.3 mm
1.7 mm
0.0075 kg
STR 27X32X1.3-Y95A
26.2 mm
1.3 mm
0.0004 kg