Attributes . 4 Bolt Pillow Block; 4-5/16" Bore; 6-11/16" Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing; 17-3/8" Minimum Bolt Spacing; 19-1/4" Bolt Spacing Maximum; Relubricatable; Cast Iron; Triple Ring Labyrinth; Non-expansion . Names