USAF housing features 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, 60 mm Bore, 24.75 to 27.88 in Bolt Center-to-Center Length, 9-1/2 in Base to Bore Centerline, 32-3/4 in Overall Length, 12.3 in Overall Width, 18.88 in Overall Height, Four-Bolt Base Mounting, Tapered Bore, 8.88 in Base Width, Adapter Mounted Locking Device, Triple-Tect™ Seal, Non-Expansion (Fixed) Expansion, 69500 lb Load, 2800 RPM Maximum, Cast Iron