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Product information

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Recommendations

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Product dataSealed bearings Page ............. 18Page ............. 32 Contamination resistance
Fig 1 Due to the efficiency of the integral seals, additional external seals are normally not required. Generally com- pact bearing arrangements can be produced in most cases. However, if the environmental conditions are harsh, external seals should be employed Warning for fluoro rubber (FPM)seals FPM is very stable and harmless in normal operating conditions – up to 200 °C (392 °F). However, ifexposed to extreme temperatures above 300 °C (572 °F), e.g. fire orthe flame of a cutting torch, fluoro rubber emits dangerous toxic vapours. Once overheated the fluororubber will remain danger-ous to handle even when cooled. Please contact SKF for complete safety instructions. See also SKF catalog 4006 “CR seals” for further information.

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1 A sealed spherical roller bearing in anSNL plummer block housing page 28 . Rule of thumb Sealed bearings do not need relubricationwhen the temperat-ures do not exceed 70 °C (158 °F) and speed are not more than 50 % of the speed rating listed in the product tables. More precise in- formation is given in the section “Lubrication and maintenance” on
Solid contamin-ants excluded Eliminate dirt in thebearing, which cre-ates indentations in both raceways androllers and causesearly failure due toflaking. The best and simplest methodtodo this is to use SKFsealed spherical roller bearings. The seals offer protec-tion for the bearinginterior during hand-ling and mounting. Moisture cannotenter Adequate sealskeep water out of the bearing, whichotherwise wouldcause corrosion and considerabledamage to theraceways, leadingto noise and early failure. The im-proved seals areendorsed by the rust inhibiting properties of the lubricant. Well lubricated Well protected Always reliable The bearings are filled with a high-quality grease,which is particularly suitable for SKF spherical rollerbearings. Integralseals contribute to the efficient lubrica-tion by keeping thelubricant in position inside the bearing. Bearings for normaloperating temperat-ures and speeds arelubricated with the SKF lithium basegrease LGEP 2 withexcellent rust inhibit- ing properties. The bearings have asheet steel reinforc-ed double-lip sealat each side. Seals can be made ofnitrile rubber (NBR),hydrogenated nitrile rubber (HNBR) or fluoro rubber (FPM). 11