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-      20 M a r M o t i o n . H i g h - p re c i s i o n ro t a r y s t ro k e b e a r i n g s

 Mahr

Closed Guide Bush with Sealing Rings

N 553

       Suitability

       Design as for N 550, with sealing and stop rings fixed on both sides.
       • When used in combination with shaft diameter dw ISO-h3, preloading of the

        rotary stroke bearing is guaranteed.
       • Guide bush N 553 is designed for use in dirty environments.
       • The sealing rings prevent any dirt particles from penetrating.

        (The rubbing action of the sealing rings on the shaft affects the smooth running
        of the rotary stroke bearing slightly.)
       • Secure path limitation for the ball cage is ensured.

       Features

       • Sealing and stop rings fixed on both sides.
       • The closed guide bush and integrated ball cage form a separate component.
       • Guide bore diameter d1 is finely honed to ISO tolerance IT 3, Rz 0.5 – 1.5 m

        depending on diameter.
       • Roundness within 1/3 ISO-IT 3.
       • Cylindricity within IT 1.
       • Radial run-out of a shaft inserted under preloading is within 0.0005 mm.
       • Outside diameter dB n4 with radial run-out error within IT 4, ground to guide bore

        diameter d1, lead-in taper on one side.
       • The maximum stroke path Hmax of the rotary stroke bearing is determined from the length

        of guide bush l3 and the length of the ball cage l2: Hmax = 2 (l3-l2).
       • See page 37-41 for instructions on installation and servicing.

       Material

       • Special roller bearing steel 100 Cr 6 (1.2067 or 1.3505)
       • Carefully heat-treated, hardness rating HRC 60–64/HV 720–815
       • Steel stop rings
       • Sealing rings NBR rubber in steel shell
       • Maximum constant working temperature 100°C

       Special designs

       Other dimensions or designs based on workpiece drawings are available.
       These can also be produced using stainless steel (1.4112).

       Order Information

       Rotary stroke bearing consisting of:

       Guide bush N 553/dw/d1/L                                                                 Order No. 5009 . . .
       Ball cage N 501/dw/d1/l2                                                                 Order No. 50010 . .
       or

       Ball cage N 500/dw/d1/l2                                                                 Order No. 50000 . .

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