439 Series: Rotary Seal – Fabric Reinforced
The 439 series rotary seal is a popular seal used in moderate- to high-speed applications that require maximum reliability and long service life.
439 Series
The 439 series rotary seal is a popular seal used in moderate to high speed applications that require maximum reliability and long service life. The unique encapsulated spring ensures that the spring remains in place during a blind installation. The main body is strong yet flexible for ease of installation and stability within the groove. The lip force is optimized for the full range of sizes by varying designs of the internal spring, allowing low friction and minimal wear.
Installation Drawing
Material Ranges
The 439 series rotary seal features high-grade NBR reinforced with elastomer and fabric heel. To suit a variety of applications, the series is also available in higher temperature HNBR and FPM compounds.
| NBR fabric / garter spring | MN139 |
| HNBR fabric / garter spring | MN145 |
| FKM or FPM / fabric / garter spring | MF24 |
Temperature Ranges
MN139
°C
°F
hydraulic oil
-30…+100
hydraulic oil
-22…+212
water oil emulsions (HFA
+5…+60
water oil emulsions (HFA
+41…+140
water-glycol fluids (HFC)
-30…+60
water-glycol fluids (HFC)
-22…+140
polyol esters (HFD)
-30…+80
polyol esters (HFD)
-22…+176
water
+5…+100
water
+41…+212
Speed
15 m/s (50 ft/sec)
Speed
15 m/s (50 ft/sec)
Pressure
7.25 bar(105 psi)
Pressure
7.25 bar(105 psi)
Designed for flexibility across materials, sizes, and performance requirements. Standard and custom diameters ensure optimal integration into your system.
Engineered Performance
Built to Perform
The 439 Series Rotary Seal is used in industrial rotary applications that require minimum wear and long service life.
Benefits
- Lip force is optimized for a range of sizes by varying designs of the internal spring
- Works in a wide range of temperatures
- Excellent fluid compatibility
- Exceptional abrasion resistance
- Available in diameters up to 2100mm
Applications
- Steel and Aluminum Processing
- Pulp and Paper
- Pumps and Gear Boxes
- Marine
- Wind Energy
- Bearing Manufacturers
