HS series slewing ring bearings provide exceptional load and thrust capacity in a surprisingly small envelope. They are similar in size to Kaydon® popular RK series, but have a rectangular cross-section and less internal diametral clearance. This lets them handle about twice the moment load(up to 139900 ft-lb). Kaydon® Bearings Slewing Ring Bearing, Four-Point Contact High-Capacity, Series: HS Series, 20.4 in External Dia, 12-7/8 in Internal Dia, 2.2 in Height, Internal Gear, Single Rows, 50500 ft-lb, Rubber Seal, 13-1/4 in Pitch Circle Dia, 3/4 in ID/0.688 in OD Bolt Hole Dia, 500 fpm Maximum, -40 to 140 °F