Material：38CrMoAIA

Quenched and tempered hardness：HB260-280

Diameter：φ15mm-φ300mm

Length-to-diameter ratio：4-35

Nitriding hardness：HV900-1000

Depth of the nitrided layer：0.5mm-0.7mm

Nitriding brittleness：≤ Level 2

Surface roughness：Ra0.4um

Straightness：0.015mm/m

Inner and outer diameter tolerances：≤0.02mm

Circle jumping：≤0.04mm

Total length tolerance of the screw：≤0.03mm

Keyway spline tolerance grade：Level 7