bearing engineering data recommended shaft and housing fits roper mounting fits of ball bearings to shafts and in housings are critical to their performance excessively tight or excessively loose fits can result in premature bearing failures recommended fit values have been established which will facilitate optimum bearing performance the shaft and housing fits listed below apply to the 1600 seriestm and 7500 seriestm bearings they may also be used for the housing fits only on the 3000 seriestm 7600 seriestm and 6900 seriestm bearings p housing fits housing rotating bearing outside diameter max ...