Main surfaces roughness

- shaft portions for installing bearings – 0.8;

- shaft portions for installing gears, half-couplings, sprockets, pulleys:

if d < 55 mm – 0.8, if 55 < d < 120 – 1.6;

- shoulder face end for bearings fixation – 1.6;

- shoulder face end for fixation of gears, sprockets, pulleys, half-couplings – 3.2;

- shoulder potion for installing seals – 0.2;

- working surfaces of a keyseat made in the shaft – 1.6;

- holes of gears that are installed on the shaft

if d < 55 mm – 0.8;

if 55mm < d < 120mm – 1.6;

- gear face end that is fixed by the shaft shoulder or the face end of other element – 3.2;

- free gear face end – 6.3;

- tooth profile

for 6^th degree of accuracy – 0.4;

for 7^th degree of accuracy – 0.8;

for 8^th degree of accuracy – 1.6;

for 9^th degree of accuracy – 3.2;

- working surfaces of a keyseat made in the hub– 3.2.