An integral spline shaft turned and spline-milled in a single setup — journals, retaining-ring grooves and the involute spline all come off the same machine. This is the shaft pattern we quote most often for drive, hydraulic and gearbox customers.
Concentricity between the spline and both bearing seats is not recovered by re-chucking and dialing in. It is held by one setup on a fixed datum: face and OD turned first, spline milled on the same machine, then only the bearing seats ground after quenching and tempering. First article and part number one thousand run on the same machine with the same gauges — which is why their inspection sheets match.
Send the torque, speed range and mating parts — spline size or DIN 5480 designation, bearing numbers, available envelope — and we will recommend material and heat treatment (Q&T, case hardening or induction hardening), then quote with the spline inspection chart and first-article report. Reply within 48 hours.