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NK21/16R - NTN

NK21/16R

Needle roller bearing, machined-ring, without inner ring, double-side ribs, lubrication hole

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Technical datasheet

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PRODUCT DEFINITION
BrandNTN
Fw - Under rollers diameter21 mm
D - External diameter29 mm
C - Width of bearing, drawn cup or outer ring16 mm
rs - Min fillet radius0,3 mm
Lubrication hole on outer ringYes
k - Hole diameter2,5 mm
Radial clearance classCN
Precision classP0
Mass0,028 kg
Product classification image
PRODUCT PERFORMANCE
Cr - Dynamic load rating13,7 kN
C0r - Static load rating18,7 kN
Nlim - Grease lubrication limit speed13000 tr/min
Nlim - Oil lubrication limit speed19000 tr/min
Tmin - Min operating temperature-20 °C
Tmax - Max operating temperature120 °C
BEARING FREQUENCIES
BPFO - Characteristic outer ring frequency (60 rpm)7,596 Hz
BPFI - Characteristic inner ring frequency (60 rpm)9,404 Hz
FTF - Characteristic cage frequency (60 rpm)0,447 Hz
BSF - Characteristic rolling element frequency (60 rpm)9,294 Hz
ABUTMENT
Da max - Max shoulder diameter OR27 mm
ras max - Max shaft & housing fillet radius0,3 mm