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Ball Bearing Torque Information || Dynaroll

TECHNICAL INFORMATION

BEARING TORQUE


Small diameter (< 20 mm O.D.) deep groove ball bearings have extremely low and uniform torque characteristics. Even when preloaded as part of an assembly, average torque levels of less than 0.5 gm-cm (0.007 oz-in) are common. Typically, torque is dependent on many factors, including ball size, number of balls, retainer type and looseness, radial play, lubricant type and fill percentage, and applied load.


M15 Torque Tester Screenshot

For more information and a discussion on bearing torque and torque analysis, see Assembly Characteristics.

BEARING TORQUE FACTORS


FACTOR
 TORQUE EFFECT
Ball size
 Smaller gives lower torque
Number of balls
 Fewer gives lower torque
Retainer
 Crown gives lower torque, loose clinch for ribbon type gives lower torque
Radial play
Higher gives lower torque
Lubricant Higher viscosity gives higher torque
Lubricant fill Higher percentage gives higher torque
Applied load Higher load gives higher torque
The chart below can be used as a simple guide to expected average torque levels for individual bearings with oil lubricant, however, the user must be cautioned that real-life torque values will vary considerably according to the application.

AVERAGE BEARING TORQUE (GM-CM)


DYNAROLL
BEARING SIZE
(Inches Series)
RETAINER
TYPE
BALL SIZE
Inch (mm)
# BALLS
THRUST LOAD (gm)
MAX. AVG. TORQUE (gm-cm), OIL LUBE @ INDICATED THRUST
RADIAL PLAY Inches (mm)
MC2
.0001-.0003
.002-.008
MC3
.0002-.0004
.005-.010
MC5
.0005-.0008
.013-.020
09,0,1,1-4, 1-5 144, 155, 156, 168
Crown (W)
<1/16
<13
75
.18
.15
.14
2-5
Ribbon (J)
1/16
6
75
.18
.15
.14
2-6, 2, 166
Ribbon (J)
1/16
<8
75
.2
.16
.15
188
Ribbon (J)
2
8
400
.63
.54
.49
3
Ribbon (J)
3/32
7
400
.65
.55
.5
4
Ribbon (J)
3/32
8
400
.7
.6
.55