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 19-338-395A
78.74 mm
1.7 mm
338
0.002 kg
STR 70X75X1.3-Y95A
69.5 mm
1.3 mm
0.0008 kg
STR 19-209-395A
17.04 mm
1.5 mm
209
0.0003 kg
STR 19-217-395A
29.74 mm
1.5 mm
217
0.0004 kg
STR 19-218-395A
31.34 mm
1.5 mm
218
0.0004 kg
STR 19-229-395A
59.92 mm
1.5 mm
229
0.0007 kg
STR 19-233-395A
72.62 mm
1.5 mm
233
0.008 kg
STR 19-243-395A
104.37 mm
1.5 mm
243
0.0011 kg
STR 19-244-395A
107.54 mm
1.5 mm
244
0.0012 kg
STR 19-268-395A
215.49 mm
1.5 mm
268
0.0025 kg
STR 19-269-395A
221.84 mm
1.5 mm
269
0.0025 kg
STR 19-130-395A
40.94 mm
1.3 mm
130
0.0003 kg
STR 19-272-395A
240.89 mm
1.5 mm
272
0.0028 kg
STR 19-151-395A
75.87 mm
1.3 mm
151
0.0005 kg
STR 19-315-395A
19.99 mm
1.7 mm
315
0.0006 kg
STR 19-152-395A
82.22 mm
1.3 mm
152
0.0007 kg
STR 19-317-395A
23.16 mm
1.7 mm
317
0.0007 kg
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 19-160-395A
133.02 mm
1.3 mm
160
0.0007 kg