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Emerson Bearing Company
201 Brighton Avenue
Boston, MA 02134
Phone: (800) 225-4587 • Fax: (800) 252-1996
Email: info@emersonbearing.com
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Needle Roller Bearings have a high load carrying capacity and can operate at high speeds. They have slim design and are suited where radial space is limited. They are available with or without an inner ring.

Needle roller bearings with inner rings are used if the shaft cannot be used as a raceway.
Needle Roller Bearings NA 4900 Single Row with Inner Ring
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Item #

(d) Bore Diameter

(D) Outside Diameter

(B) Width

(C) Dynamic Load

(Co) Static Load

Weight

NA4900 N/A 10 mm N/A 22 mm N/A 13 mm N/A 8800 N N/A 10400 N N/A 0.02 g
NA4900 2RS N/A 10 mm N/A 22 mm N/A 13 mm N/A 7370 N N/A 8150 N N/A 0.03 g
NA4901 N/A 12 mm N/A 24 mm N/A 13 mm N/A 9900 N N/A 12200 N N/A 0.03 g
NA4901 2RS N/A 12 mm N/A 24 mm N/A 13 mm N/A 8090 N N/A 9650 N N/A 0.03 g
NA4902 N/A 15 mm N/A 28 mm N/A 13 mm N/A 11200 N N/A 15300 N N/A 0.03 g
NA4902 2RS N/A 15 mm N/A 28 mm N/A 13 mm N/A 9130 N N/A 12000 N N/A 0.04 g
NA4903 N/A 17 mm N/A 30 mm N/A 13 mm N/A 11400 N N/A 16300 N N/A 0.04 g
NA4903 2RS N/A 17 mm N/A 30 mm N/A 13 mm N/A 9520 N N/A 12900 N N/A 0.04 g
NA4904 N/A 20 mm N/A 37 mm N/A 17 mm N/A 21600 N N/A 28000 N N/A 0.08 g
NA4904 2RS N/A 20 mm N/A 37 mm N/A 17 mm N/A 19400 N N/A 22400 N N/A 0.08 g
NA49/22 N/A 22.000 mm N/A 39 mm N/A 17 mm N/A 23300 N N/A 32000 N N/A 0.08 g
NA4905 N/A 25 mm N/A 42.000 mm N/A 17 mm N/A 24200 N N/A 34500 N N/A 0.09 g
NA4905 2RS N/A 25 mm N/A 42.000 mm N/A 17 mm N/A 21600 N N/A 27500 N N/A 0.09 g
NA49/28 N/A 28.000 mm N/A 45 mm N/A 17 mm N/A 25100 N N/A 36500 N N/A 0.10 g
NA4906 N/A 30 mm N/A 47 mm N/A 17 mm N/A 25500 N N/A 39000 N N/A 0.10 g
NA4906 2RS N/A 30 mm N/A 47 mm N/A 17 mm N/A 23300 N N/A 32000 N N/A 0.11 g
NA49/32 N/A 32.000 mm N/A 52.000 mm N/A 20 mm N/A 30800 N N/A 51000 N N/A 0.16 g
NA4907 N/A 35 mm N/A 55.000 mm N/A 20 mm N/A 31900 N N/A 54000 N N/A 0.17 g
NA4907 2RS N/A 35 mm N/A 55.000 mm N/A 20 mm N/A 27000 N N/A 43000 N N/A 0.18 g
NA4908 N/A 40 mm N/A 62 mm N/A 22 mm N/A 42900 N N/A 71000 N N/A 0.23 g
NA4908 2RS N/A 40 mm N/A 62 mm N/A 22 mm N/A 36900 N N/A 58500 N N/A 0.25 g
NA4909 N/A 45 mm N/A 68.000 mm N/A 22 mm N/A 45700 N N/A 78000 N N/A 0.27 g
NA4909 2RS N/A 45 mm N/A 68.000 mm N/A 22 mm N/A 39100 N N/A 64000 N N/A 0.29 g
NA4910 N/A 50 mm N/A 72 mm N/A 22 mm N/A 47300 N N/A 85000 N N/A 0.27 g
NA4910 2RS N/A 50 mm N/A 72 mm N/A 22 mm N/A 40200 N N/A 69500 N N/A 0.30 g
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