Attributes . 4 Bolt Pillow Block; 2-7/8" Bore; 4-1/2" Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing; 11-5/8" Minimum Bolt Spacing; 13-1/8" Bolt Spacing Maximum; Relubricatable; Cast Iron; Triple Ring Labyrinth; Non-expansion . Names