KR Hex Socket Track Roller

Product Details

A KR bearing occupies only one mounting hole. The stud passes through that hole, the shoulder locates against the front face, and a nut secures the assembly from behind. The hexagonal recess visible in the product images is used to stop the stud from turning during tightening.

This arrangement is commonly found on mechanisms whose movement is determined by a physical profile rather than a straight guide rail. As the mechanism cycles, the outside surface of the bearing follows the changing height or direction of the profile.

The internal needle rollers are held in a cage. This creates a different operating arrangement from KRV models, which use a greater number of uncaged rollers. A KR bearing should therefore be replaced with the same series unless the machine load and speed have been checked again.

Inspection and Replacement

The contact mark on a used roller can reveal more than its outside diameter. A narrow mark close to one edge usually means the roller is not meeting the guide evenly. A mark spread across the working face indicates more uniform contact.

When replacing an unidentified bearing, measure the roller diameter, roller width, stud diameter, thread and distance from the roller face to the end of the stud. Plate thickness must also leave enough usable thread for the locking nut.

Check the mounting hole before fitting the replacement. An enlarged or damaged hole can allow the stud to lean even when the nut feels tight. The guide surface should also be inspected for steps, dents and accumulated material that could strike the roller during every cycle.

Product Information

FAQ

Why is there a hexagonal socket in the stud end?

It provides a tool position for holding the stud while the rear locknut is tightened.

Is a separate mounting bolt required?

No. The threaded stud forms part of the bearing and passes directly through the machine mounting hole.

How does KR differ from KRV?

KR uses caged needle rollers. KRV normally uses a full-complement arrangement without a cage, so the two series should not be treated as interchangeable.

Can the roller run on untreated sheet metal?

Only when the track material, thickness and surface condition can withstand the repeated contact stress. A soft or uneven track may wear before the bearing itself.

What must be supplied for replacement selection?

Provide the complete bearing designation whenever possible. Otherwise, measure the outer-ring diameter and width, stud diameter, thread, stud length and shoulder position.

Can one standard bearing be ordered?

We accept orders as small as a single piece for standard sizes. Please contact us for delivery lead time based on order quantity.

About Us

Lishui Guangyuan Industry & Trade Co Ltd supplies cam followers, track rollers and related motion components for industrial machinery. Replacement selection can be checked from an existing KR designation or from the mounting dimensions of the original bearing.

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