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HFB · SN
SN split plummer block housings
The same design as SNI but to DIN 736 through 739, with a tighter seat — H7 instead of H8.
The difference from SNI comes down to two things: a wider standard range and an H7 seat tolerance. A tighter seat means a more precise fit of the bearing outer ring.
That matters where the shaft has to be guided, not merely supported. For typical conveyor and fan duty SNI is enough — SN is a deliberate choice.
For fan assemblies where high speeds call for continuous lubrication, the manufacturer offers SN..VS and SN..R versions with grease regulators.
Source
HFB catalogue 2011/03, page 6.
From the manufacturer's catalogue
- Dimensional standard
- DIN 736 to 739
- Seat tolerance
- H7
- Material
- grey cast iron GG 20; GGG 40 and GS 45 on request
- Seal
- felt as standard
- Bearing
- spherical roller and self-aligning ball
- Lubrication
- grease
- items in the catalogue
- 201
Other series
- SNIA split plummer block to DIN 736 and 737 — the most bought HFB series and the usual replacement for SNL housings.
- SDA split housing for heavy loads, with a labyrinth seal as standard and stronger GG 25 iron.
- GOS / GOFHousings for high speeds and temperatures, oil-lubricated through a splash ring. Mostly in fan assemblies.
- BTLSolid GS 45 cast steel housings for conveyor drums, with a double labyrinth at both ends.
- STLSplit take-up housings for conveyor drums, in GS 45 cast steel with a double labyrinth.
- TVNUnsplit housings for self-aligning ball bearings with a cylindrical bore, supplied as floating bearings.