Engineering Reference

Precision Ball & Roller Bearings
(Medium to Large Diameter)

Roller Bearing Features

NHBB manufactures cylindrical roller bearings in a wide range of sizes, designs, and configurations. We also can design and build sophisticated roller bearings with custom features, such as puller grooves, mounting flanges, and anti-rotation devices. The tables and diagrams on this page illustrate some typical specifications for rings and rollers, including ring configurations, tolerances, ring standards, and roller retention methods.

Roller Bearing Configurations

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TPU Inner

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TPU Outer

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TPUU Inner
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TPUU Outer

Roller Tolerances

Diameter & LengthExamplesCorner
Crown DropFlat Length
5mmMin: .0001"
Max: .0003"
Min: .050"
Max: .130"
22mmMin: .00070"
Max: .00096"
Min: .300"
Max: .540"
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Flat length and crown drop.

Roller Ring Standards

Guide Flanges

-Surface finish
-Layback angle tolerance
-Runout to ring face
-Roller end clearance tolerance

10 Ra
0.0003 in.
0.0010 in.

Roller Paths


-Surface finish
-Wall Thickness Variation to I.D./O.D.

6 Ra
.000050 in.
.000300 in.

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Guide flange and roller path.

Cage/Roller Retention Comparison

Cage StyleMethod of
Control of
Roller Drop
Reuse After
NDT InspectionManufacturing
Rolled FormedPrior to assembly, cage is "roll formed" to create retention. Yields a relatively
high roller drop as a function of roller diameter. 
YesAll methodsLow
Line StakedAfter rollers are in place, line stake tool forms retention. Tab is formed after assembly for close control of roller drop. No
not possible.)
Visual onlyModerate
Fully MachinedRoller retention is
formed during
Yields a relatively
high roller drop as a function of roller diameter. 
YesAll methodsHigh

Cage/Roller Retention Diagrams

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Roll formed.

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Line staked.

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Fully machined.