Dimensions

NBC stock code

Dimensions

Grease points

Ball f

Mass

Thrust

load

(mm)

(kg)

(ton)

U01L030

298

293

220

200

0.5

U01L040

400

320

300

0.75

U01L050

500

420

400

U01N060

600

516

490

1.7

U01N065

650

568

543

1.7

U01N070

700

620

594

2.2

U01N075

750

668

640

2.2

U01N080

800

718

690

2.5

U01N085

850

767

742

U01N090

900

820

793

3.5

U01N095

950

870

843

3.5

U01N100

1000

920

895

U01N105

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Technical

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U Series Trailer rings

o Supplied undrilled. (We regret that to supply bearings with a customer-specific drilling pattern is possible only for volume orders).

Applications

o Coated with a protective black rust-proofing paint

Agricultural steering applications
Irrigation systems
Airport luggage trolleys
Automated packing equipment
Snow blowers

Assembly of ball turntable bearings

Turntable bearings are supplied undrilled, but must be fixed to the structure by bolts, never by welding. Thrust plates can be welded to the structure to limit radial movement before the trailer ring is finally fitted.

For smooth operation, it is important that the supporting surfaces be as flat and rigid as possible. Ensure that the turntable bearing is supported by the connecting structure over at least 50% of its surface and that the supporting areas are distributed symmetrically in regard to the direction of movement.

Holes should not be drilled in line with the ball loading plug which may be identified by the welding on the raceway of the external ring. The plug should be placed at an angle between 45° and 90° with regard to the direction of movement.

The size of the bolts and the recommended tightening torque values are indicated in the table.

Series U	Min no of bolts	Bolt size Grade 8.8	Bolt torque (Nm)
L Section	4	M12	78
N Section <750mm	6	M12 – M14	78 – 126
N Section >800mm	6	M14 – M16	126 – 193
P Section	8	M14 – M16	126 – 193
T Section	8	M16	193

Maintenance of ball turntable bearings

Turntable bearings have grease nipples on the outer surfaces. They leave the factory only lightly greased and it is imperative that customers check that they are adequately lubricated before entering service.

It is good practice to carry out periodic lubrication of the bearing. The frequency of greasing must be adjusted according to working conditions, but on average once a month should be sufficient. As trailer rings are generally unsealed, grease is used as a barrier to contaminant entry.

Grease should be pumped into the bearing until it extrudes or leaks out of the fissure between the two rings. During the greasing operation, allow the turntable bearing to rotate which will purge contaminants and emulsified grease from the bearing.

Any general purpose lithium or lithium-calcium EP2 grease is suitable.

Bolt torques should be checked as part of a routine maintenance schedule, or at least once a month, depending on use.

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Enquire Now About Series U

For any enquiries regarding Series U, please complete our enquiry form, and a member of our technical team will respond promptly. Alternatively, you can reach out directly to one of our offices using the contact details here. Our specialists are ready to provide guidance and support tailored to your machinery and engineering needs.