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. Heavy duty designs include spherical bearings (21306, 21307, 21308, 21310)
Only high-quality tube specially manufactured for conveyor idlers is used and conforms to SABS 657/3 (1980).
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.
Moulded rubber rings are manufactured from high-quality abrasive-resistant rubber as standard. Various rubber grades such as fire retardent and acid resistant are available as options (data sheets available on request). Where required, rubber rings utilise internally moulded steel rings in order to positively fix them onto the roller body.
Stepped lightweight hollow steel shafts, equivalent in strength and rigidity to solid shafts, are available on request.
Manufactured from deep drawing steel to EN 10111(DD14). Housings are pressed and MIG welded to the inside of the tube. Heavy-duty designs use solid computer numerical controlled (CNC) machined housing.
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.