The black painted idler hubs on this 3,500 lb Axle have the following features:
Inner Bearing Surface: 1 3/8" (Bearing 68149)
Outer Bearing Surface: 1 1/16" (Bearing 44649)
Grease Seal: 1.72" Inner Diameter Grease Seal Surface
Hub Bolt Pattern: 5 lug on 4 1/2" Bolt Pattern fits most 5 bolt trailer wheels
Dust Caps: 1.98" Accu-lube style zinc-plated dust caps with a removable plug to access grease zerk fitting
This Listing is For a 73" Hub Face Axle that has the Spring Perches welded at 58". This 73-inch Measurement is also referred to as the Track Measurement, or Center of Tire Measurement.
Specific Axle Specifications for this 3,500 lb Trailer Axle:
Hub Face: 73"
*Refers to the Outside Face of one Hub as it meets the wheel to the outside face of the opposing hub as it meets the wheel
Brake Flange Measurement: 67"
*Refers to the Outside of one Brake Flange to the outside of opposing brake flange
Overall Axle Length (Tip to Tip not including hubs and dust caps): 78"
*Refers to the tip of one side of axle spindle to the opposing tip
Camber: Cambered, Axle Camber is intended for use with Leaf springs mounted below the axle.
Spring Seat Location: Spring Seats are welded at 58", this would mean that your Center of Leaf Spring Measurement would be 58".