Page 1 of Features of NTN Engineering Plastics by NTN Corporation Japan

2 standard series of ntn engineering plastics sliding bearings the following six series of standard bearings are prepared for a wide variety of applications type ar sleeve bearing ar series is machined from a bar or pipe made of bearee fl 3000 material this bearing only carries radial load and the standard bore size is to 50mm 3 type arf flanged sleeve bearing type arf adds a flange to type ar and can carry radial and axial load the standard bore size is 3 to 50mm type brf flanged sleeve bearing type brf is made by injection molding and its material is bearee as 5005 this bearing is flanged to carry radial and axial load the standard bore size is 3 to 25mm lighter weight and more compact designs than with the arf type are possible type tw thrust washer the type tw thrust washer is made from bearee fl 3000 tape the thickness is 0.8mm and standard bore is 6 to 50mm type ml m liner bearing type ml is a rolled steel plate bushing with bearee fl 3060 liner bonded on its bore and the steel plate is zinc coated for rust prevention this bearing carries higher pressure than types ar or arf having a thin wall and a more compact design is possible the standard bore size is 3 to 70mm and several widths are available for each bore mlc type mlc bearing the mlc type is a three layered bearing composed of a special filler containing tetrafluoroethylene impregnated on the porous sintered layer made of bronze powder sintered on the back metal steel plate the mlc bearing for radial loads the flanged mlcf bearing that can accept radial and axial loads and thrust load mlcw bearings are standardized 1 bearee fl can be deformed or scratched by shock load etc and bearee pi can be cracked or chipped 2 surface roughness of the mating material greatly affects bearing life ntn recommends surface roughness of 0.1-0.8ra 3 the operating temperature may loose the clearance in the shaft and result in overheating burning and seizing of the mechanism completely check the relation between fittings and clearances before application 9

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