UC, HC, SA, SB and UK insert bearings
Ball bearings with a spherical outer ring — they differ only in how they are fixed to the shaft and in the sealing.
All these bearings have a spherically ground outer ring, so they align themselves in the spherical housing bore and compensate for misalignment. They allow no axial movement, which rules them out as floating bearings.
Choosing the series means choosing the fixing. An eccentric collar (HC with the inner ring extended on both sides, SA on one) is intended for a constant direction of rotation. Grub screws (UC on both sides, SB on one) take an alternating direction. An adapter sleeve (UK) suits higher speeds and changing directions.
Every version is sealed on both sides and filled with lithium soap grease No 2. The permissible temperature range for seals and lubricant is −30 °C to +100 °C; under normal conditions they run maintenance-free. The HC-R3 series carries a triple seal for extreme conditions, and UC adds outer sliding discs.
Source
HFB catalogue 2011/03, pages 119–127.
- Shaft fixing
- HC and SA — eccentric collar; UC and SB — grub screws; UK — adapter sleeve
- Seal
- sealed both sides as standard; HC-R3 triple
- Lubrication
- lithium soap grease No 2, filled at the works
- Temperature range
- −30 °C to +100 °C
- items in the catalogue
- 112
Other series
- SNIA split plummer block to DIN 736 and 737 — the most bought HFB series and the usual replacement for SNL housings.
- SNThe same design as SNI but to DIN 736 through 739, with a tighter seat — H7 instead of H8.
- 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.
- PDNIOne body with two bearing seats on a single shaft — the catalogue names fan assemblies as the main application.