Back-up Roll Bearings from BBC Bearings are manufactured with very high accuracy- essential for thinner gauge uniform thickness strip rolling. Our bearings have excellent working accuracies with run-out of less than 5 microns.
The outer races are manufactured from either full hardened medium carbon chrome steel or nickel chrome molybdenum steel. The outside diameter is provided with chamfers at the corners and reliefs towards the edges to relieve the loading stresses. Inner Rings and Rollers are generally manufactured from high carbon chrome bearings steel and are fully hardened. Rollers also have properly finished corners and are cambered to avoid stress concentration at the ends.
Back-up Roll Bearings are normally supplied in sets with 'T' dimension within 5 microns.