A stainless flange hub where the central bore, the flange spigot and the face are finished in one setup, and the two lightening windows are milled on a 4-axis. This is the flange pattern we build most for coupling, wheel hub and driveline customers.
Whether a flange runs true comes down to two things: concentricity between the spigot and the bore, and perpendicularity of the flange face to the axis. Neither can be dialled back in later — they only hold if they are turned in one setup. Milling the windows releases stress in the blank, so the sequence is windows first, then finish turning the spigot; do it the other way round and the work is wasted. Bolt holes are drilled and reamed on the PCD to ±0.1 mm, and the counterbores are faced separately so the bolt heads seat flat.
Send the mating part — coupling, wheel hub or pump mount — plus torque, speed, spigot fit and bolt size. For rotating parts we quote dynamic balancing (G6.3) as an option, and ship CMM, runout and material certificates with the parts. Reply within 48 hours.