Kinetic ACB518H8 | Headset Bearing

From Kinetic:

Inner x Outer x Depth (mm): 40 x 51.8 x 8
Inch Dia: 1-1/2”
Angle / Chamfer (Deg): 45 / 45
Bearing ID: 40.00mm
Bearing OD: 51.8mm
Bearing Thickness: 8.0mm
Internal Angle: 45 Degrees
External Angle: 45 Degrees
Material: Bearing Steel
Grease: Mobil XHP-222 or SINOPEC HTHS Bearing Grease
Seal: Single-seal
Material: Chrome Steel 100Cr6 (Race & Balls)
Cage Material: Nylon PA66
Equivalent Part Ref: PT-R425