The housing base is reinforced with ribs and extra material surrounding the holes for the attachment bolts in order to improve seating on the base plate.
The attachment bolts can be preloaded to give better location and cannot deform the housing base or housing bore.
Housings have two attachment bolt holes in the base as standard. Housings of size 511-609 and larger are also available with four cast attachment bolt holes as standard, designated FSNL.
These larger housings are also available without attachment bolt holes , but only made of ductile cast iron. Also the smaller housings below size 511-609 can be used for four bolt mounting. Cast indications show where to drill the additional holes.
Good heat conduction
The extra ribs the housing base provide additional surface area between the base and base plate to improve heat flow away from the bearing.
Housings are supplied with a grease nipple. Two tapped holes for the nipple in the cap are standard. Cast indications mark other grease nipple locations for relubrication of the bearing or the seals.
Caps and bases individually marked
The housing base and cap are matched during manufacture and are not interchangeable. To prevent mixing, the same consecutive number is marked on the cap and base of each individual housing.
To simplify mounting and make alignment more accurate, cast indications in the end faces of the housing base indicate the housing bore axis and the vertical axis.
Mounting instructions are also supplied with each housing.
Indications for holes to accommodate other components
Cast indications mark the positions where holes can be drilled for dowel pins, sensors for condition monitoring and additional grease nipples.