This zinc-plated idler hub features a 5x4.5 bolt pattern with 1/2 inch wheel studs, fits standard 1 3/8" x 1 1/16" tapered spindles for 3,500 lb axles, uses L68149 inner and L44649 outer bearings with seal 168255 (sold separately), and has a hub capacity of 1,850 lbs for a total axle rating of 3,700 lbs.