Attributes . 4 Bolt Pillow Block; 5-5/16" Bore; 7-1/2" Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing; 20-7/8" Minimum Bolt Spacing; 23-5/8" Bolt Spacing Maximum; Relubricatable; Cast Iron; Triple Ring Labyrinth; Non-expansion . Names