Wheel hub bearing unit adapted for cold forming connection to the brake member

A vehicle wheel hub bearing unit, wherein an outer race (10) of the bearing has a radial bearing flange (11) providing a first axially protruding edge (12) adapted for being folded by rolling in a radially outer direction to secure for rotation a flange (21) of a brake member (20) by clamping the brake flange (21) between said first rolled edge (12') and a second peripheral undeformed radial edge (13) of the same bearing flange (11), wherein:

• the hardness of the material forming said first edge (12) to be deformed by rolling is between about 200 HV and about 300 HV;
• said first edge (12) protrudes axially from the brake flange (21) by a length (d) shorter than 5 mm;
• the thickness (e) of said first edge (12) is within about 1 and about 3.5 mm;
• and
• the axial thickness (a) of said first edge (12') deformed by rolling against the brake flange (21) is less than 3.5 mm and the axial thickness (c) of said second undeformed radial peripheral edge (13) exceeds said axial thickness (a) by a length x=0.4.div.1 mm.