The rollers in the NN type bearing are guided by the ribs of the inner ring.
Unit of Measure

Technical Specifications

Type

Cylindrical Roller Bearing

Bore Type

Tapered

Material

Hardened Alloy Steel

Cage Material

High Strength, 2 piece, Machined Brass

Limiting Speed - Oil

1000 rpm

Limiting Speed - Grease

850 rpm

Taper

1:12

Precision

ISO Class 0

Tolerance

ISO Class 0 (RBEC 1)

Oil Hole

w/o Oil Hole

Radial Internal Clearance

CN

Static Load Rating

1250000 lbf5550000 N5550.00 kN

Dynamic Load Rating

485000 lbf2150000 N2150.00 kN

Enclosure

Open

Operating Temperature Range

-40 to 250 ºF-40 to 120 ºC

Dimensional Specifications


Double Row Cylindrical Roller Bearing w/ Tapered Bore - Type NNU - Dimensions

d

17.3228 in440.000 mm

D

23.6220 in600.000 mm

B

6.2992 in160 mm

C

6.2992 in160.000 mm

Fw

19.3701 in492.000 mm

r

0.1575 in4.000 mm

da min

17.9528 in456.000 mm

db min

18.4646 in469.000 mm

Da max

22.9921 in584.000 mm

ras max

0.1181 in3 mm