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Koyo NA4920 needle roller bearing with a 100 mm bore, 140 mm OD, and 40 mm width. Machined ring design with inner ring, open type. Suitable for high radial load applications in gearboxes, pumps, and industrial machinery.
MODEL NA4920
$407.35 Each
Prices are subject to change
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Bore
3.937 in / 100 mm
Brand
KOYO
Closed End
No
Harmonized Tariff Code
8482.40.00.00
Inch - Metric
Metric
Manufacturer Item Number
NA4920
Number of Rows of Rollers
Single Row
Other Features
Plain Inner Ring / 2 Rib Outer Ring / Steel Cage / Oil Hole
Outside Diameter
5.512 Inch / 140 Millimeter
Relubricatable
Yes
Retainer
Yes
Rolling Element
Needle Roller Bearing
Self Aligning
No
Separable
Inner Ring - Both Sides
Thrust Bearing
No
Type
Needle Non Thrust Roller Bearings
UNSPSC
31171512
Width
1.575 Inch / 40 Millimeter
- Best used for high radial load applications
- Made from premium high carbon high chromium Japanese steel
- Available with no inner ring (NK NKS RNAO RNA2200 RNA48 RNA49 series)
- Available with inner ring (NA48 NA49 NA69 NAO NKJ NKJS series)
- Available as a double row with inner ring (NA69 series)
- Available as a double row without inner ring (RNA69 series)
- A steel cage is standard .TN calls out a polymer cage
- Available with two seals (.2RS) in the RNA4900
How do I choose the right type of bearing for my application?
Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.
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