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SKF Radial Shaft Seal (CR Seal) CRW1 R - NBR
Radial shaft seals for general industrial applications, radial shaft seals sit between rotating and stationary components, or two components in relative motion.
They have two main parts, one is a cylindrical outer covering with an interference fit that seals statically against the housing bore.
The second, a sealing lip, seals dynamically and statically against the shaft.
Its sealing edge presses against the counterface surface of the shaft with a defined radial load.
With Auxiliary Lip, Nitrile Rubber.
Auxiliary Lip: Non-Contacting.
About Applications and Operating Conditions (HMS5 and HMSA10)
HMS5 and HMSA10 seals are designed for oil or grease lubricated applications with operating temperatures ranging from –40 to +100 °C (–40 to +210°F), short-term up to 120°C (250°F).
These seals are also appropriate for sealing lubricants within a wide range of viscosities.
Circumferential Speed: up to 14 m/s (2 755 ft/min).
Operating Pressure Max: 0.03 MPa (5psi).
These values are the maximum value for each service condition and should not occur together.
Consideration should be given as to how the operating conditions affect each other.
About Design SKF Radial Shaft Seal (HMS5 and HMSA10 Seals)
The rubbers outside diameter provide the optimized sealing ability in the housing, also at considerable surface roughness or in split housings.
The beads on the outside diameter provide improved sealing ability and retention in the bore.
They also prevent spring-back during installation.
The spring-loaded sealing lip contributes to a quick response in handling dynamic runout and maintaining the sealing performance, even when sealing lip wear is excessive.
The sealing lip and flex section are optimally balanced to withstand both high dynamic runout and shaft-to-bore misalignment.
The auxiliary lip on HMSA10 seals is non-contacting, which means that the seals normally can operate at the same speeds as the single-lip HMS5 seals.
About Nitrile Rubber
The term nitrile rubber is used in this publication for acrylonitrile-butadiene rubber (NBR).
This material has very good engineering properties and is a general-purpose sealing lip material.
It is a copolymer manufactured from acrylonitrile and butadiene that provides good resistance to the following media:
Most mineral oils and greases with a mineral oil base.
Normal fuels like gasoline, diesel, and light heating oils.
Animal and vegetable oils, fats, and hot water.
Nitrile rubber also tolerates short-term dry running of the sealing lip.
The permissible operating temperature range of nitrile rubber is -40 to +100 °C (-40 to +210°F) For brief periods, temperatures of up to 120°C (250°F) can be tolerated.
SKF also offers a special nitrile rubber compound with a temperature range between -55 and +110°C (-65 and +230°F).
