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

Cylindrical

Material

Hardened Alloy Steel

Cage Material

High Strength, 2 piece, Machined Brass

Limiting Speed - Oil

2000 rpm

Limiting Speed - Grease

1700 rpm

Precision

ISO Class 0

Configuration

Two

Tolerance

ISO Class 0 (RBEC 1)

Oil Hole

w/o Oil Hole

Radial Internal Clearance

CN

Static Load Rating

315000 lbf1410000 N1410.00 kN

Dynamic Load Rating

137000 lbf610000 N610.00 kN

Enclosure

Open

Weight

39.022 lb17.700 kg

Operating Temperature Range

-40 to 250 ºF-40 to 120 ºC

Dimensional Specifications


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

d

9.4488 in240.000 mm

D

12.5984 in320.000 mm

B

3.1496 in80 mm

C

3.1496 in80 mm

Fw

10.4331 in265.000 mm

r

0.0827 in2.100 mm

da min

9.8819 in251.000 mm

db min

10.1575 in258.000 mm

Da max

12.1654 in309.000 mm

Db min

11.9685 in304.000 mm

Db max

12.1654 in309.000 mm

ras max

0.0787 in2 mm