FRB15/250 SKF Locating Ring Sealed Distance to Thread Centre (B4):

Distance to Thread Centre (B4): 4

Pitch length: 5364mm

Inside width B: 30

DUNFLEX coupling flanges are available in either F (Taper Bush fits inside) or H (Taper Bush fits outside) or pilot bored (PB) which can be bored to the required size

with 9 being the best possible rating

FRB15/250 SKF Locating Ring Sealed Distance to Thread Centre (B4):A bearing in the locating position must be secured axially in the housing. If the bearing seat in the housing and the bearing width do not match, locating (stabilizing) rings are required. Typically, two locating rings are required per housing. One ring should be placed on each side of the bearing. If only one locating ring is required, it should be installed on the same side as the lock nut.