SD - = - maximum outside diameter/spindle diameter
ID - = - ±1 mm inside diameter of the spiral spring ± 1 mm
AD - = - diameter of the spiral spring
Lh - = - maximum extension length in case of horizontal installation
Lv - = - maximum extension length in case of vertical installation
BB - = - width of band, corresponds to Lmrn
AF - = - inside diamter of the centring flange AD + 4 mm
IF - = - outside diameter of the centring flange ID - 2 mm