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 Housing, Type USAF, Series: 538, 4-Bolt Base Mount, 7.88 in Base to Bore Centerline, 7-1/2 in Overall Length, 10.81 in Overall Width, 15.81 in Overall Height, Compatible Bore Diameter: 6-15/16 to 7 in, Compatible Bearing Type: 22200K Series Adapter Mounted Bearing, 21.63 to 24.38 in Bolt Center-to-Center Length, 7-1/2 in Base Width, Cast Iron Cast-in dimples locate drill holes for lube fittings, vents, sensors and mounting modificationsHousing base is threaded to accept four Grade 5 cap bolts for added strengthStandard housings have two oversized drains adaptable to circulating oil systemsPry slots allow easy separation of the pillow blockOne end closed