USAF housing attributes including solid cast feet to increase strength, large capacity oil sump with two oversized drain holes adaptable to circulating oil systems, cast in oil return slots to keep lubricants in, oil-equalization passage allowing pillow block to be drained completely from either side, offset dowels with matched numbers on cape and base to simplify correct assembly, cast-in dimples to locate drill holes for lube fittings, vents, sensors and mounting modifications, housing base threaded to accept grade 5 cap bolts for added strength and pry slots between the cap and base to allow easy separation. Utilizes E design spherical roller bearing insert for higher load carrying capacity. USAF and USDAF match industry standard SAF and SDAF mounting dimensions. Dodge Pillow Block Roller Bearing Unit, Type USAF, 4-15/16 in Bore Dia, 15.63 to 17.38 in Bolt Center-to-Center Length, 6 in Base to Bore Centerline, 19.69 in Overall Length, 8.77 in Overall Width, 11.81 in Overall Height, 4-Bolt Base Mount, Tapered Bore, 5.88 in Base Width, Adapter Mount Locking Device, Metal Labyrinth Seal, Expansion Type: Non-Expansion, 196000 lb Dynamic/236000 lb Static, 1700 rpm Grease/2200 rpm Oil Maximum, Cast Iron, Uncoated Closed end housings offer greater protection in high pressure wash-down environmentsSolid cast iron feet increase strength in both 2 and 4-bolt stylesStandard modifications for wet and harsh environments include nylon coating, epoxy paints and nickel plating and stainless steel hardwareNew drop in Triple-Tect seal makes seal installation easierLarge capacity oil sump lowers operating temperatures, undercut bearing seat allows full lateral travel of expansion bearing, prevents stabilizer ring from binding and makes installation easyOil equalization passage simplifies maintenance and pillow block can be drained completely from either sideOil return slots are cast into the interior seal grooves to keep lubricantsAllows oil in the seal grooves to return to the oil sump instead of leakingOffset dowels with matched numbers on cap and base joint simplify correct assemblyBoth ends open