SKF
Two-Bearing Housings (PD Series)
The PD series two-bearing housings from SKF integrate a locating and a non-locating bearing within a single, compact cast iron housing. They typically combine an angular contact ball bearing or deep groove ball bearing as the locating element with a cylindrical roller or deep groove ball bearing as the non-locating element. PD housings are for applications requiring accurate shaft guidance, moderate speeds, and space efficiency — such as electric motor driven fans, pump impeller shafts, and small gearbox input shafts. The sealed, lubricated-for-life units simplify design, reducing the number of separate housings and alignment steps. SKF offers PD housings with various sealing options and standardised flange or foot mountings. Their integrated, pre-adjusted clearance ensures reliable operation without on-site bearing setup, accelerating assembly and improving consistency.
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Pre-Engineered Bearing Arrangement
Fixed and floating bearing in one housing.
Compact Shaft Support
Eliminates need for two separate housings and couplings.
Pre-Set Internal Clearance
No field adjustment needed; ready to install.
Lubricated and Sealed
Factory-filled grease, protected from contamination.
Multiple Mounting Options
Foot or flange for integration into machine frames.
Reduced Assembly Cost
One component instead of multiple for a complete bearing support.
PD Series in Small Pump and Fan Modules
OEMs of centrifugal fans and close-coupled pumps benefit from the PD unit’s single housing with integral bearings. The unit is bolted to the fan panel and the shaft slides through; no alignment of separate plummer blocks is required, simplifying production and field service.
Locating/Non-Locating Principle in the PD Housing
The locating bearing (often a deep groove ball bearing clamped in the housing) resists axial loads. The non-locating bearing (cylindrical roller or deep groove with loose fit) allows thermal shaft expansion. This arrangement prevents internal preload buildup that would cause overheating.