d 200-380mm
Product Parameter
Designation X-life Mass
m
≈kg
Principal dimensions
mm
Basic load ratings
KN
Fatigue limit load
Cur/N
Limiting Speed
nG
min–1
Reference Speed
nB
min–1
d F D B r
min
s2) Dyc
Cr
Stc
Cor
NA4840 XL 5840 200 220 250 50 1.5 1.5 260000 720000 102000 2150 1250
NA4844 XL 6380 220 240 270 50 1.5 1.5 275000 790000 110000 1980 1110
NA4848 XL 10000 240 265 300 60 2 2 400000 1080000 150000 1780 960
NA4852 XL 10600 260 285 320 60 2 2 415000 1160000 158000 1660 870
NA4856 XL 15300 280 305 350 69 2 2.5 510000 1300000 175000 1540 840
NA4860 XL 21800 300 330 380 80 2.1 2 700000 1770000 235000 1420 720
NA4864 XL 23000 320 350 400 80 2.1 2 710000 1850000 242000 1340 670
NA4868 XL 24200 340 370 420 80 2.1 2 730000 1940000 249000 1270 620
NA4872 XL 25600 360 390 440 80 2.1 2 740000 2020000 255000 1210 590
NA4876 XL 42600 380 415 480 100 2.1 2 1130000 2900000 370000 1130 510
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Introduction
& nbsp; features single or double row needle roller bearing with flange consists of machined outer ring, needle roller and cage components with flange and separable inner ring. X-life needle roller bearing with flange is X-life bearing. these bearings have optimized raceway surfaces. Therefore, it has higher bearing capacity and longer rated life. needle roller bearing without inner ring needle roller bearings without inner ring have extremely compact radial dimensions. However, they require that the raceway of the shaft be hardened and ground. '> 40mm . needle roller bearing with inner ring if the shaft cannot be used as the raceway of rolling bearing, the bearing with inner ring shall be used. this kind of bearing has a single row design, but also a double row design na69 , its d & Ge; 32mm . inner circle displacement the standard inner ring is allowed to have displacement in the axial direction not exceeding the value listed in the dimension table. When large displacement occurs, the standard ferrule can be replaced by wide inner ring IR . inner circle: see page 776 . seal And. On both sides are contact seals. lubrication bearings are lubricated with composite lithium grease ga08 . arcanol load150 suitable for relubrication. For this purpose, the outer ring has a lubricating groove and a lubricating hole. 'EN-US ' > d & le; The 7mm series of NKI have no lubrication holes and grooves. sealing ring and wide inner ring in order to prevent the influence of the outside world, the combination of seal ring series ( G , GR and SD ) and wide inner ring IR can be used for bearing sealing. The sealing ring and inner ring should match the needle bearing. The outer surface of the inner ring can be used as the sliding surface of the sealing lip. sealing ring: see page 804 and tpi128 , single lip and double lip sealing rings. working temperature the operating temperature range of open bearing is & ndash; 20 ℃ to + 120 ℃. limited by grease and sealing materials, the operating temperature range of needle bearing with seal is & ndash; 20 ℃ to + 100 ℃. cage there are two kinds of cages: steel cage and nylon cage. The suffix of the bearing with nylon cage is TV . before using nylon cage bearing, check the compatibility of lubricant and cage material (PA66 GF / h) . suffix see the following table for suffixes of existing designs. suffix of existing design
suffix