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NA4840 - NTN

NA4840

Needle roller bearing, machined-rings, with inner ring, double-side ribs

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Technical datasheet

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PRODUCT DEFINITION
BrandNTN
d - Internal diameter200 mm
D - External diameter250 mm
C - Width of bearing, drawn cup or outer ring50 mm
F - Under roller diameter220 mm
rs - Min fillet radius1,5 mm
s - Max axial offset1,5 mm
Lubrication hole on outer ringYes
k - Hole diameter3,5 mm
Lubrication hole on inner ringNo
Radial clearance classCN
Precision classP0
Mass5,84 kg
Product classification image
PRODUCT PERFORMANCE
Cr - Dynamic load rating231 kN
C0r - Static load rating705 kN
Nlim - Grease lubrication limit speed1200 tr/min
Nlim - Oil lubrication limit speed1800 tr/min
Tmin - Min operating temperature-20 °C
Tmax - Max operating temperature120 °C
BEARING FREQUENCIES
BPFO - Characteristic outer ring frequency (60 rpm)28,044 Hz
BPFI - Characteristic inner ring frequency (60 rpm)29,956 Hz
FTF - Characteristic cage frequency (60 rpm)0,484 Hz
BSF - Characteristic rolling element frequency (60 rpm)30,3 Hz
ABUTMENT
da min - Min shoulder diameter IR208 mm
Da max - Max shoulder diameter OR242 mm
ras max - Max shaft & housing fillet radius1,5 mm