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 19-237-395A
85.32 mm
1.5 mm
237
0.001 kg
STR 19-245-395A
110.72 mm
1.5 mm
245
0.0013 kg
STR 90X95X1.3-Y95A
89.5 mm
1.3 mm
0.001 kg
STR 19-039-395A
69.57 mm
1.1 mm
039
0.0003 kg
STR 95X105X1.7-Y95A
94.1 mm
1.7 mm
0.0032 kg
STR 115X120X1.3-Y95A
114.5 mm
1.3 mm
0.0011 kg
STR 130X135X1.3-Y95A
129.5 mm
1.3 mm
0.0015 kg
STR 13X17X1.3-Y95A
12.3 mm
1.3 mm
0.0001 kg
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 180X190X1.7-Y95A
179.3 mm
1.7 mm
0.0051 kg
STR 19-014-395A
12.42 mm
1.1 mm
014
0.0001 kg
STR 19-015-395A
14.0 mm
1.1 mm
015
0.0029 kg
STR 19-017-395A
17.17 mm
1.1 mm
017
0.0001 kg
STR 19-024-395A
28.3 mm
1.1 mm
024
0.0002 kg
STR 19-026-395A
31.47 mm
1.1 mm
026
0.0002 kg
STR 80X90X1.7-Y95A
79.2 mm
1.7 mm
0.0025 kg
STR 19-032-395A
47.35 mm
1.1 mm
032
0.0002 kg
STR 85X90X1.3-Y95A
84.5 mm
1.3 mm
0.001 kg
STR 19-033-395A
50.52 mm
1.1 mm
033
0.0002 kg