Ball bearings
Four-Point Contact Ball Bearings
One ring, two contact points per ball. A single bearing locates the shaft axially in either direction inside a section height that a pair of angular contact bearings would not fit.
- Series
- QJ · QJF
- Bore
- 35 – 400 mm
- Class
- P5
Design
Two directions, one ring.
Every batch is measured on the finished part, and the measurement file travels with the goods. Send a designation, a drawing or a photo of the failed part and an engineer will answer with a lead time and a price, usually inside 48 hours.
- Two contact points per ballThe split inner ring lets one ball touch four raceway points, so either direction takes thrust.
- 35° contact angleA steep angle for axial capacity while keeping some radial capability.
- QJF split inner ringThe split design allows two-piece mounting where the shaft shoulder is in the way.
- Narrow sectionLocates the shaft in a space that a matched pair cannot use.
Technical data
QJ · QJF| Designs | QJ · QJF (split inner ring) |
|---|---|
| Bore range | 35 – 400 mm |
| Outer diameter | 72 – 620 mm |
| Rows | 1 (four-point contact) |
| Accuracy | P5 standard, P4 on request |
| Contact angle | 35° |
| Cage | Machined brass |
| Lubrication | Oil or grease |
Where it is used
Common applicationsGearbox locating positions
Axial location in both directions in one bearing position.
Machine-tool tables
Rotary table location where section height is limited.
Crane wheels
Axial guidance with radial load shared with a cylindrical roller bearing.
Pump shafts
Locating the rotor where a pair would be too wide.
Send the part number.
We will send the answer.
A designation, a drawing, or a photo of the failed part is enough to start. Technical questions reach an engineer, not a mailbox.
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