Ball Bearing
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National Ball Bearing

Part No. 203-FF Warranty Details  

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Designed to provide enhanced endurance and maximum contamination exclusion while ensuring proper fit, form and function.
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Bearing Type:Radial Ball Bearings
Inner Diameter:0.6693 in
Outer Diameter:1.5748 in
Width:0.4724 in


by PowerReviews
NationalBall Bearing

(based on 2 reviews)

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Reviewed by 2 customers

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Common Idler/Tensioner Pulley Bearing


from Tampa, FL

About Me Auto Enthusiast, Casual Driver, Competitive Driver

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Level 6


  • Durable
  • Smooth


    Best Uses

    • Everyday Driving

    Comments about National Ball Bearing:

    This bearing is often the bearing in idler and tensioner pulleys, but they will not show up in lookups because many pulleys are the plastic kind that are molded to the bearing, meaning that you can't pull it out without destroying the pulley.

    However, if you have a metal pulley, and you want to keep it because all the available replacements are plastic, you can usually get this, pop the old one out, and put this one in.

    This is also a fantastic bearing for various home projects since it is sealed up, small, and inexpensive.

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    (6 of 14 customers found this review helpful)


    Not correct pilot bearing for Gen 1 SBC

    Comments about National Ball Bearing:

    This was in the list of pilot bearings/bushings that would fit my Gen1 SBC (2 pc RMS) in my 86 Z28- all parts selected were made on an 85 Z28 Vin G on Advance's website. It did not fit- close, but loose. Went with the bushing included in the clutch kit instead so I can take this back. It seems to be a nice bearing otherwise, too bad it was a wrong match.

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    Do you have questions about this product?(earn points for answers!)


    Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

    3 Questions | 3 Answers
    Displaying questions 1-3
    • Q:

      will this bearing fit a the ac clutch??
      Asked on 11/16/2014 by sergeo

      1 answer



        Hi Sergeo, To further assist with the part number 203-FF, please provide us the year, make, model and engine size of your vehicle.

        Answered on 11/17/2014 by Steve from AAP
    • Q:

      Is this the bearing for the power steering pully?
      Asked on 10/15/2010 by Stang Jeep from Bradenton, FL

      1 answer



        No. This is the bearing for the alternator.

        Answered on 10/15/2010 by Kevin the King of Auto Parts. from AAP
    • Q:

      Is this the pilot bearing?
      Asked on 6/19/2010 by Anonymous

      1 answer



        No this is not a pilot bearing.

        Answered on 6/21/2010 by Kevin from AAP
    Displaying questions 1-3

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    Disclaimer We strive to keep all information accurate and up-to-date; however, product availability, pricing, promotions and store hours are subject to change without notice. Please contact Customer Care if you have any questions or corrections.