Machine parts; components for operating and tightening machines; handwheels, spoked handwheels, disc handwheels, disc handwheels with a fixed or flip-over handle, indicator handwheels, lobed handwheels, operating handwheels with one or more arms, position indicator handwheels with a dial, blocking handwheels; analogue, digital, mechanical and electronic position indicators; cranks with an arm or lever; handles; fixed, rotating or flip-over grips; fixed, folding and tightening handles; levers and lever arms; industrial handles, balanced handles, return handles, flip-over handles, lifting handles; operating and blocking cranks, handles, levers and hand-grips; hand-grips, lobed hand-grips, knurled hand-grips, knurled hand-grips with a graduated ring, hand-grips with a graduated ring, tightening hand-grips, regulating hand-grips; components for oleodynamic and lubrication systems; level indicators; stoppers and lids, screw stoppers, level indicator stoppers, warning light stoppers, stoppers with a dipstick, stoppers with an air vent, valved stoppers, filling and discharge stoppers; column type level indicators.;