The NTN Bower 3877HD is a tapered roller bearing cone with a 41.275 mm ID and a 30.162 mm cone width. This listing is for the cone only. The bearing designation is catalog series 3800, made to tolerance class ABMA Class 4 (Inch). Sold by Pro Gear and Transmission. Call us if you need help confirming the right size for your application.Interchanges:Timken 3877$57.78FeaturesTapered roller bearing cone, catalog series 380041.275 mm IDCone width 30.162 mmTolerance class ABMA Class 4 (Inch)Tech SpecsBearing designation: 3800ID: 41.275 mmCone width: 30.162 mmTolerance class: ABMA Class 4 (Inch)