Trailer Hub Wheel Bearing 44643 for 2,000lb Trailer Axles, 1" ID

This Trailer Roller Bearing is the Standard Bearing Number 44643, which means it's designed to fit on a 1" Spindle, and into the Bearing Race # 44610.  This is a Tapered Roller-Style Bearing, which is the most common bearing type among Trailer Hubs.  This particular bearing is typically used on Trailers with a Capacity of 2,000 - 2,200lbs.  This Size Bearing is usually seen in 4 Lug or 5 Lug Trailer Hubs, but it is not the only bearing size found in hubs of that capacity.  For this reason, it's always best to check your Trailer Hubs and Axle to make sure you get a proper Bearing replacement for your Boat or Utility Trailer. For example, this bearing is typically used in pairs on a 1 inch straight spindle in the 2,000lb capacity range, but there is also a 1 1/16" spindle and bearing combination in the same 2,000lb weight rating as well.  This small 1/16" diameter difference is important, so it's necessary to double-check your Trailers Bearing Numbers or to measure the Spindle size using digital calipers to make sure you get the correct bearings for your Trailer.