In addition to standard design SNL and SE plummer (pillow) block housings, a number of variants are also available. Variants include housings made of different materials, alternative attachment bolt hole configurations, different bearing seat tolerance classes, and modifications for special applications.
For applications where extra strength is needed, SNL and SE housings are also available in spheroidal graphite cast iron. Housings made of spheroidal graphite cast iron are available from size 516-613 and are supplied with a solid base (no holes for attachment bolts) as standard. From size 516-613 the housings can be supplied with four oblong holes cast in the base. All housings made of spheroidal graphite cast iron can be supplied with two drilled holes for attachment bolts (designation suffix /MS1).
Attachment bolt holes
SNL plummer block housings can be supplied with the following bolt hole configurations:
four cast holes
Dimensions are listed in the product tables for bearings on an adapter sleeve and for bearings with a cylindrical bore. These housings are designated FSNL or FSE.
four drilled holes
These variants are available for housings with two cast bolt holes, designation SNL or SE, and for housings made of spheroidal graphite cast iron with a solid base, designation SSNLD or SSED.
Dimensions are listed in table 1. These housings have the designation suffix /MS2.
All two-bolt housings have dimples, which mark the bolt hole positions for four-bolt mounting.
two drilled holes
This variant is available for housings made of spheroidal graphite cast iron with a solid base, designation SSNLD or SSED.
Dimensions are listed in table 1. The housings have the designation suffix /MS1.
Bearing seat tolerance
SNL and SE housings can be supplied with different bearing seat tolerance classes, e.g. for applications prone to vibration, with rotating outer ring load, or for applications operating at high temperatures.
For additional information, contact the SKF application engineering service.
Housings for oil lubrication
For oil lubrication, special seals are required to prevent oil leakage. Oil seals require a modified housing and therefore these housings are supplied together with the seals as a unit. SNL housings are available for oil lubrication from size 516-613. The housing with oil seals is identified by the suffix TURU, e.g. SNL 524 TURU.
SE housings are not available for oil lubrication.
SNL plummer block housings have a small oil sump. Be careful not to overfill the sump, or leaks can result. SONL plummer block housings are specially designed for oil lubrication and may be more advantageous. For detailed information refer to Split plummer block housings SONL series.