Attributes . 4 Bolt Pillow Block; 4-1/2" Bore; 4-15/16" Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing; 12-5/8" Minimum Bolt Spacing; 14-1/2" Bolt Spacing Maximum; Relubricatable; Cast Iron; Triple Ring Labyrinth; Non-expansion . Names