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The needle roller bearing NA,NKI series, also known as the solid ferrule needle roller bearing with inner ring, consists of one or two ferrules and a needle roller set with a cage. Depending on the application, it can be divided into bearings with or without inner ring. Therefore, the physical ferrule needle roller bearing can meet the requirements of light weight, small space occupation and large transmission power. Solid ferrule needle bearings have a small volume and high load carrying capacity.
NA series suffix symbol
Seal type | ZZ | metal shields on both sides |
| 2RS | rubber seals on both sides | |
| Z | metal shield on one side | |
| RS | rubber seal on one side |
Bearings with an inner ring are used for applications where the shaft cannot be hardened and ground and have limited permissible axial displacement of the shaft relative to the housing.
FAQS:
Q: What is the grade of needle roller?
A: General speaking -2/-4,or according to clients' requirments.
| select | Inquiry | Bearing type | Mass(g) | Boundary dimensions (mm) | ||
|---|---|---|---|---|---|---|
| d | F | D | ||||
| NKI8 | 46 | 8 | 14 | 25 | ||
| NKI9/12 | 14.6 | 9 | 12 | 19 | ||
| NA4900 | 21 | 10 | 14 | 22 | ||
| NKI10/16 | 27.3 | 10 | 14 | 22 | ||
| NA4901 | 25.1 | 12 | 16 | 24 | ||
| NA6901 | 44.5 | 12 | 16 | 24 | ||
| NKI12/20 | 39 | 12 | 16 | 24 | ||
| NA4902 | 32 | 15 | 20 | 28 | ||
| NA4903 | 32.8 | 17 | 22 | 30 | ||
| NA6902 | 61.6 | 15 | 20 | 28 | ||
| NKI15/16 | 38 | 15 | 19 | 27 | ||
| NKI15/20 | 45.7 | 15 | 19 | 27 | ||
| NA6903 | 68.2 | 17 | 22 | 30 | ||
| NA4904 | 70.2 | 20 | 25 | 37 | ||
| NA4905 | 76 | 25 | 30 | 42 | ||
| NA6904 | 20 | 25 | 37 | |||
| NA6905 | 138 | 25 | 30 | 42 | ||
| NKI17/16 | 41.4 | 17 | 21 | 29 | ||
| NKI20/16 | 48.5 | 20 | 24 | 32 | ||
| NKI22/16 | 50 | 22 | 25 | 34 | ||
| NKI25/20 | 25 | 29 | 38 | |||
| NKI25/30 | 115 | 25 | 29 | 38 | ||
| NA49/28 | 90.7 | 28 | 32 | 45 | ||
| NA69/28 | 170 | 28 | 32 | 45 | ||
| NA4906 | 101 | 30 | 35 | 47 | ||
| NA4907 | 151 | 35 | 42 | 55 | ||
| NA4908 | 230 | 40 | 48 | 62 | ||
| NA6906 | 192 | 30 | 35 | 47 | ||
| NA6907 | 301 | 35 | 42 | 55 | ||
| NA6908 | 401 | 40 | 48 | 62 | ||
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