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
TPLL
TPLU
| TPSU |
TPUS
TPU Inner
TPU Outer
TPUL
| TPUU Inner |
| TPUU Outer |
Roller Tolerances
| Diameter & Length | Examples | Corner | |
|---|---|---|---|
| Crown Drop | Flat Length | ||
| 5mm | Min: .0001" Max: .0003" | Min: .050" Max: .130" | .012-.018" |
| 22mm | Min: .00070" Max: .00096" | Min: .300" Max: .540" | .030-.040" |
Flat length and crown drop.
Roller Ring Standards
Guide Flanges
| Features | Standard |
|---|---|
| -Surface finish -Layback angle tolerance -Runout to ring face -Roller end clearance tolerance | 10 Ra |
Roller Paths
| Features | Standard |
|---|---|
-Surface finish | 6 Ra |
Guide flange and roller path.
Cage/Roller Retention Comparison
| Cage Style | Method of Manufacture | Control of Roller Drop | Reuse After Disassembly | NDT Inspection | Manufacturing Complexity |
|---|---|---|---|---|---|
| Rolled Formed | Prior to assembly, cage is "roll formed" to create retention. | Yields a relatively high roller drop as a function of roller diameter. | Yes | All methods | Low |
| Line Staked | After rollers are in place, line stake tool forms retention. | Tab is formed after assembly for close control of roller drop. | No (Disassembly not possible.) | Visual only | Moderate |
| Fully Machined | Roller retention is formed during broaching. | Yields a relatively high roller drop as a function of roller diameter. | Yes | All methods | High |
Cage/Roller Retention Diagrams
Roll formed.
Line staked.
Fully machined.
