An induction bearing heater is the safest, fastest way to mount a bearing with an interference fit. It heats the bearing evenly so the inner ring expands and slides onto the shaft, with no hammering, no open flame and no hot oil. This guide explains how induction bearing heaters work, what temperature to heat to, how to pick the right size, and the mistakes that shorten bearing life. Why Heat a Bearing Before Mounting? Most bearings are mounted with an interference fit, so the inner ring is slig …