TRU-TRAC® STEEL ROLLERS

Suitable for all applications and environments, Tru-Trac manufactures one of the largest selections of steel conveyor rollers used extensively in overland applications around the world.

Incredibly robust, each roller consists of thick metal pressings which are MIG welded into conveyor-grade Electric Resistance Welded (ERW) tube, resulting in an extremely strong construction with low TIR (total indicator runout).

Key Aspects

Diameters – 89—219mm
Roll Lengths – 150—3000mm face length
TIR – Typically less than 0.5mm at roll ends
Bearing Sizes – Standard range 6204 to 6312
Noise – typically less then 75 dBA
Centrifugal labyrinth sealing arrangement
Material Specifications – SANS 657 III conveyor-grade steel tube

Steel Rollers Range
Our product range is not limited to these sizes. Please contact Tru-Trac for more information on our full product range.

 

SPECS

Bearings
Deep groove double sealed or shielded bearings, of tolerance class C3 and C4, are used. This allows for a larger amount of angular misalignment at the bearing when compared with other bearing designs and classes.

Steel Tube
Only high-quality tube specially manufactured for conveyor idlers is used and conforms to SABS 657/3 (1980). Shell ends are machined to prevent belt wear.

Steel Shaft
Manufactured from steel which complies with the requirements for grade 070 M20 of BS 970-1. Shaft diameter tolerance adheres to bearing manufacturer standards and ensures a js6 fit. Shaft end slots are machined to customer standards.

Hollow Shaft
Stepped lightweight hollow steel shafts, equivalent in strength and rigidity to solid shafts, are available on request.

Bearing Housing
Manufactured from deep drawing steel to EN 10111(DD14). Housings are pressed and MIG welded to the inside of the tube.

Corrosion Protection
An external coat of self-etching primer is applied unless otherwise specified.

Circular Movement Tolerance (TIR)
TIR does not exceed 0,5mm measured at a distance of 25mm from the roller end face. Actual TIR values are less and can be verified by referencing historical data.

SEAL DESIGN

To ensure the smoothest most energy-efficient ride possible, each Lorbrand steel roller employs a three-seal design that eliminates dirt through self-cleaning.

Primary Seal
Any dirt that enters the primary seal is collected and then allowed to escape by being flung radially outward through centrifugal force.

Secondary Seal
Most secondary seals on the market utilise a labyrinth design which prevents dirt from escaping the sealing area—with centrifugal force actually keeping dirt in—before working its way back to the bearing.

Lorbrand’s secondary seals avoid this problem because all sealing surfaces are free from contact, they do not require packing with grease and the seal arrangement allows water to drain freely when the roller is stationary. The result: dirt is unrestricted when being propelled outwards by centrifugal force.

Bearing Seal
As the final barrier against dirt ingress, especially rust particles that form due to condensation inside the shell tube, each Lorbrand bearing features seals on both sides and is lubricated for life.