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A pillow block bearing (also known as a plummer block) is a pre-assembled, mounted bearing unit consisting of a rolling-element bearing (typically ball or roller) housed within a robust, bolt-on casing. Designed for easy installation and alignment, it supports rotating shafts in industrial machinery while handling radial loads and moderate axial loads.
1. Housing
Material: Cast iron, stamped steel, or stainless steel.
Design: Split or solid body with a flat base for horizontal mounting.
Sealing: Integrated seals/labyrinths to exclude contaminants (dust, moisture).
2. Bearing
Types: Self-aligning ball bearings (common), spherical roller bearings (heavy-duty).
Lubrication: Pre-greased or provision for relubrication (zerk fitting).
3.Locking Mechanism
Options: Set-screw, eccentric lock, or adapter sleeve for secure shaft attachment.
3. Self-Alignment Capability
Compensates for shaft misalignment (±3°–5°) due to mounting/operational deflections.
