Needle Roller Bearings, Precision - Inch and Metric

Needle roller bearings are essentially cylindrical roller bearings except that their cylindrical rollers have a length 3 to 10 times their diameter (versus less a length less than 3 times their diameter). Therefore, the ratio of the bearing outside diameter to the inscribed circle diameter is small, and they have a rather high radial load capacity.

Even though they have a low cross section, precision needle roller bearings have a high radial load capacity and are exceptionally suited for bearing applications where radial space is limited.

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Precision Needle Roller Bearings Available from AST Bearings

Many different types or series of precision needle roller bearings are available from AST. Not all of them are currently listed in our interactive online catalog. The following series are included in our catalog:

NCS Series - Needle roller bearings that have inch dimensions precision ground raceways with ribs, without Inner Rings, cage guided rollers, with/without Seals.
NK Series - Needle roller bearings that have metric dimensions, precision ground raceways with ribs, without Inner Rings, cage guided rollers, with/without Seals.
RNA 48 Series - Needle roller bearings that have metric dimensions, without Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 48 Dimensional Series.
RNA 49 Series - Needle roller bearings that have metric dimensions, without Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 49 Dimensional Series.
RNA 69 Series - Needle roller bearings that have metric dimensions, without Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 69 Dimensional Series.

Drawn Cup Needle Roller Bearings Also Available

Separate from precision needle roller bearings, AST Bearings has a full line of "drawn cup" needle roller bearings to choose from which we simply call "Needle Roller Bearings". If your application doesn't require precision needle roller bearings, then check out our Needle Roller Bearings selection.

In addition to the series included in our catalog above, the following types or series of precision needle roller bearings are available from AST.

NA 48 Series - Needle roller bearings that have metric dimensions, with Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 48 Dimensional Series.
NA 49 Series - Needle roller bearings that have metric dimensions, with Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 49 Dimensional Series.
NA 69 Series - Needle roller bearings that have metric dimensions, with Inner Rings, with/without Seals, precision ground raceways with ribs, cage guided rollers, and ISO 69 Dimensional Series.
NAO Series - Radial Needle Roller Bearings that have metric dimensions without ribs, with Inner Rings, and with/without Seals.
NKI Series - Needle roller bearings that have metric dimensions, with Inner Rings, cage guided rollers, precision ground raceways with ribs, with/without Seals.
NKIS Series - Needle roller bearings that have metric dimensions, larger outside diameter and heavier load capacity (vs. NKI Series), with Inner Rings, cage guided rollers, precision ground raceways with ribs, with/without Seals.
RNAO Series - Radial Needle Roller Bearings that have metric dimensions without ribs, without Inner Rings, and with/without Seals.

Need Assistance Selecting the Proper Precision Needle Roller Bearings?

If you need help in selecting the best products for your particular application, please remember that design engineering and application assistance are available from AST as part of our value-added services designed to make your job easier.

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