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    The rollers in the NN type bearing are guided by the ribs of the inner ring.
Double Row Cylindrical Roller Bearings
Double Row Cylindrical Roller Bearings - Dimensions
Unit of Measure
Items Double-Row-Cylindrical-Roller-Bearing-Cylindrical-Bore-Type-NN
NN3005
Double Row Cylindrical Roller Bearing w/ Cylindrical Bore - Type NN
Double-Row-Cylindrical-Roller-Bearing-Cylindrical-Bore-Type-NN
NN3005C1NAP4
Double Row Cylindrical Roller Bearing w/ Cylindrical Bore - Type NN
Double-Row-Cylindrical-Roller-Bearing-Cylindrical-Bore-Type-NN
NN3005C1NAP5
Double Row Cylindrical Roller Bearing w/ Cylindrical Bore - Type NN
Double-Row-CRB-Tapered-Bore-NN-Type
NN3005K
Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NN
Double-Row-CRB-Tapered-Bore-NN-Type
NN3005KC1NAP4
Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NN
Type N/A Cylindrical Roller Bearing
Bore Type N/A Cylindrical N/A Cylindrical N/A Cylindrical N/A Tapered N/A Tapered
Material N/A Hardened Alloy Steel
Cage Type N/A
Cage Material N/A High Strength, 2 piece, Machined Brass
Limiting Speed - Oil N/A 17000 RPM
Limiting Speed - Grease N/A 14000 RPM
Taper N/A N/A N/A N/A 1:12 N/A 1:12
d N/A 0.9843 in25.000 mm
D N/A 1.8504 in47.000 mm
B N/A 0.6299 in16.000 mm
C N/A 0.6299 in16.000 mm
Ew N/A 1.6260 in41.300 mm
Fw N/A
D1 N/A
D2 N/A
f N/A
p N/A
J N/A
K N/A
Cf N/A
Cf1 N/A
S N/A
E1 N/A
t N/A
Angle of Chamfer N/A
r N/A 0.0236 in0.600 mm
e (Allowable Axial Move) N/A
da min N/A 1.1417 in29.000 mm
db min N/A 1.1811 in30.000 mm
Db min N/A 1.6535 in42.000 mm
Db max N/A 1.6929 in43.000 mm
ras max N/A 0.0236 in0.600 mm
Precision N/A ISO Class 0 N/A ISO Class 4 N/A ISO Class 5 N/A ISO Class 0 N/A ISO Class 4
Configuration N/A Two
Tolerance N/A
Oil Hole N/A w/o Oil Hole
Radial Internal Clearance N/A CN N/A C1NA N/A C1NA N/A CN N/A C1NA
Static Load Rating N/A 6750 lbf30000 N30.00 kN
Dynamic Load Rating N/A 5800 lbf25800 N25.80 kN
Enclosure N/A Open
Weight N/A N/A 0.271 lb0.123 kg N/A 0.271 lb0.123 kg N/A N/A 0.265 lb0.120 kg
Operating Temperature Range N/A -40 to 250 ºF-40 to 120 ºC