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: 515, 2-Bolt Base Mount, 3-1/4 in Base to Bore Centerline, 11.13 in Overall Length, 5.2 in Overall Width, 6.44 in Overall Height, Compatible Bore Diameter: 2-7/16 to 2-1/2 in, Compatible Bearing Type: 22200K Series Adapter Mounted Bearing, 8.63 to 9.63 in Bolt Center-to-Center Length, 3.13 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