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 19-347-395A
107.32 mm
1.7 mm
347
0.0027 kg
STR 19-430-395A
129.54 mm
2.0 mm
430
0.0068 kg
STR 19-329-395A
50.17 mm
1.7 mm
329
0.0014 kg
STR 19-335-395A
69.22 mm
1.7 mm
335
0.0018 kg
STR 19-336-395A
72.39 mm
1.7 mm
336
0.002 kg
STR 19-427-395A
120.02 mm
2.0 mm
427
0.0059 kg
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 19-113-395A
13.94 mm
1.3 mm
113
0.0015 kg
STR 19-149-395A
71.12 mm
1.3 mm
149
0.0005 kg
STR 19-258-395A
151.99 mm
1.5 mm
258
0.0019 kg
STR 19-220-395A
34.52 mm
1.5 mm
220
0.0004 kg
STR 19-339-395A
81.92 mm
1.7 mm
339
0.0021 kg
STR 19-239-395A
91.67 mm
1.5 mm
239
0.0012 kg
STR 19-343-395A
94.62 mm
1.7 mm
343
0.0026 kg
STR 19-316-395A
21.59 mm
1.7 mm
316
0.0006 kg
STR 57X62X1.3-Y95A
56.0 mm
1.3 mm
0.0005 kg
STR 19-148-395A
69.52 mm
1.3 mm
148
0.0007 kg
STR 19-215-395A
26.57 mm
1.5 mm
215
0.0004 kg
STR 19-222-395A
37.69 mm
1.5 mm
222
0.0005 kg