Radial shaft seals

Seals Product Introduction

**Introduction to SKF Radial Shaft Seals: Engineered for Performance and Reliability**

In demanding industrial environments, effective sealing solutions are critical to protecting rotating shafts from contamination, retaining lubricants, and ensuring long-term equipment reliability. SKF radial shaft seals are precision-engineered components designed to meet these challenges, offering superior performance across a wide range of applications—from heavy-duty industrial machinery to high-speed automotive systems and precision equipment.

### **Technical Features & Design Excellence**
SKF radial shaft seals combine advanced materials, innovative design, and rigorous manufacturing standards to deliver exceptional sealing efficiency. Key features include:

– **Robust Material Options**: SKF seals utilize high-quality elastomers (such as NBR, FKM, and ACM) and reinforced polymers, ensuring compatibility with diverse operating conditions, including extreme temperatures, aggressive chemicals, and high-pressure environments.
– **Optimized Lip Geometry**: The sealing lip is precision-designed to maintain consistent contact with the shaft, minimizing friction while effectively excluding contaminants like dust, water, and abrasive particles.
– **Enhanced Sealing Technologies**: Many SKF seals incorporate auxiliary lips, spring-loaded designs, or hydrodynamic wave patterns to improve sealing performance under dynamic conditions, reducing wear and extending service life.
– **Integrated Metal Casings**: For added durability, SKF seals often feature robust metal casings that provide structural stability and secure fitment in housings, even under vibration or misalignment.

### **Performance Advantages**
SKF radial shaft seals are trusted in critical applications due to their ability to:

– **Extend Bearing & Component Life**: By preventing lubricant leakage and blocking contaminants, SKF seals reduce wear on shafts and bearings, lowering maintenance costs and downtime.
– **Operate in Harsh Conditions**: Whether in high-speed motors, off-road vehicles, or food processing equipment, SKF seals maintain integrity under thermal cycling, chemical exposure, and mechanical stress.
– **Improve Energy Efficiency**: Low-friction designs minimize power loss, contributing to energy savings in pumps, compressors, and electric motors.

### **Typical Applications**
SKF radial shaft seals are widely used in industries where reliability is non-negotiable:

– **Industrial Machinery**: Pumps, gearboxes, conveyors, and electric motors benefit from SKF seals’ ability to handle heavy loads and harsh environments.
– **Automotive Systems**: From wheel hubs to transmission shafts, SKF seals ensure leak-free performance in passenger vehicles, commercial trucks, and off-highway equipment.
– **Precision Equipment**: Medical devices, robotics, and aerospace applications rely on SKF’s high-precision seals for smooth, contamination-free operation.

By integrating cutting-edge materials, intelligent design, and rigorous testing, SKF radial shaft seals set the benchmark for sealing solutions—delivering unmatched durability, efficiency, and protection across industries. Whether for OEMs or maintenance applications, SKF seals help engineers and operators achieve peak performance while reducing total cost of ownership.

For more details on selecting the right seal for your application, explore SKF’s comprehensive portfolio of radial shaft sealing solutions.

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Designation Shaft diameter Housing bore diameter Housing groove width Seal width Limiting speed Sealing lip material Mass
21101
53.975 mm
73.03 mm
6.35 mm
2884.0 r/min
Nitrile rubber (NBR)
0.0181 kg
21108
53.975 mm
73.03 mm
11.13 mm
2880.0 r/min
Nitrile rubber (NBR)
0.0431 kg
21164
53.975 mm
76.2 mm
9.53 mm
2880.0 r/min
Nitrile rubber (NBR)
0.0249 kg
21172
53.975 mm
76.2 mm
11.13 mm
2880.0 r/min
Nitrile rubber (NBR)
0.0476 kg
21215
53.975 mm
77.749 mm
10.62 mm
11.13 mm
9218.0 r/min
Fluoro rubber (FKM)
0.059 kg
2125520
539.75 mm
590.55 mm
15.88 mm
531.0 r/min
Nitrile rubber (NBR)
4.07 kg
21269
53.98 mm
81.0 mm
9.53 mm
9240.0 r/min
Fluoro rubber (FKM)
0.0317 kg
21302
53.975 mm
82.575 mm
11.13 mm
2880.0 r/min
Nitrile rubber (NBR)
0.0612 kg
21336
53.975 mm
85.09 mm
11.13 mm
2880.0 r/min
Nitrile rubber (NBR)
0.0658 kg
21352
53.975 mm
85.623 mm
9.53 mm
2880.0 r/min
Nitrile rubber (NBR)
0.034 kg
2144360
544.53 mm
588.98 mm
15.88 mm
526.0 r/min
Nitrile rubber (NBR)
4.06 kg
2150542
546.1 mm
596.9 mm
19.05 mm
525.0 r/min
Nitrile rubber (NBR)
4.11 kg
2150580
546.1 mm
596.9 mm
25.4 mm
525.0 r/min
Nitrile rubber (NBR)
4.11 kg
215X270X23 HDS2 R
215.0 mm
270.0 mm
23.0 mm
1332.0 r/min
Nitrile rubber (NBR)
1.15 kg
21749
55.575 mm
76.124 mm
11.13 mm
2820.0 r/min
Nitrile rubber (NBR)
0.0458 kg
2175542
552.45 mm
603.25 mm
19.05 mm
519.0 r/min
Nitrile rubber (NBR)
2.1 kg
21759
55.575 mm
76.2 mm
9.53 mm
2820.0 r/min
Nitrile rubber (NBR)
0.0244 kg
20X36X7 HMSA10 RG
20.0 mm
36.0 mm
7.0 mm
3960.0 r/min
Nitrile rubber (NBR)
0.0084 kg
20X37X7 HMSA10 RG
20.0 mm
37.0 mm
7.0 mm
3960.0 r/min
Nitrile rubber (NBR)
0.0086 kg
20X38X7 HMSA10 RG
20.0 mm
38.0 mm
7.0 mm
3960.0 r/min
Nitrile rubber (NBR)
0.0092 kg
20X38X7 HMSA10 V
20.0 mm
38.0 mm
7.0 mm
14220.0 r/min
Fluoro rubber (FKM)
0.0102 kg
20X40X7 HMS5 V
20.0 mm
40.0 mm
7.0 mm
14220.0 r/min
Fluoro rubber (FKM)
0.0117 kg
20X40X7 HMSA10 RG
20.0 mm
40.0 mm
7.0 mm
3960.0 r/min
Nitrile rubber (NBR)
0.0106 kg
20X42X7 HMSA10 RG
20.0 mm
42.0 mm
7.0 mm
3934.0 r/min
Nitrile rubber (NBR)
0.0122 kg