SNR : SNC Pillow Block Housings

Sealing systemsThere are a wide variety of sealing options for the housing due to the large number of applications.The correct choice of sealing system depends on several factors. Below, you will find important informationabout all of the sealing options that are included in the standard range of SNC bearing housings.The sealing selection table on Page 17 provides a quick overview of the technical properties andpossible applications of SNC seals.Double lip seals SC..DSFelt strip seal SC..FSSNR's double lip seals have two parts, whichmakes them particularly easy to fit.They are made of the material NBR (butadieneacrylonitrile rubber). The durability and elasticity ofthe material ensure an excellent sealing effect. Thecircumferential speeds can be up to 8 m/s.For shaft diameters greater than 100mm, max. misalignmentof 0.5°, for bearing units with shaftssmaller than 100 mm max. 1°. The shaft diametershould lie within the tolerance field h9.We recommend ground shafts with a roughness ofless than R a 3.2 µm.The permissible temperature range for this seal isbetween -40 °C and +100 °C. Higher temperaturesare possible using appropriate materials.Our application engineers will be happy toadvise you on the options.Note that one seal must be ordered for eachside of the housing. The delivery includes twohalf seals.The felt strip seals are a reliable standard seal forSNC bearing housings. They are easy to fit and aftera running-in phase can be used for circumferentialspeeds of up to 15 m/s (running-in phase up toapprox. 5 m/s). Felt strip seals are suitable forgrease lubrication and temperatures of between-40 °C and +100 °C. We can also offer you a choiceof special materials for the use of higher temperatures.Misalignment may not be greater thanapprox. 0.5°. A roughness of Ra 3.2 µm must not beexceeded in the contact area.Note that one seal must be ordered for eachside of the housing. The delivery includes thetwo felt strips, the two-part aluminium retainerand 2 round cords.The felt strips are soaked in oil and fitted in theretainers at the factory and can be used immediately.No retainers are required for some bearing housings.Here, the felt strip is inserted directly into the housinggroove.12