Thus, an M2 x 0.4 screw has threads every 0.4mm. Although most metric fasteners have two or more standard pitches (fine & coarse threads), the pitch is often omitted from a thread callout; it is always helpful to carry a sample with you to the hardware store.
A tincture is a liquid extract made by soaking herbs in alcohol to extract the active ingredients from the herbs. Alcohol is considered an excellent solvent because it is food grade and can extract herbal constituents, such as resins and alkaloids, that are poorly soluble in water.
When the word first appeared in English in the 14th century, tincture referred to a coloring matter or dye, but by the 17th century the word had acquired a number of additional meanings, including a slight infusion or trace of something. Tinge and shade are two other words referring to color that can be used the same way. Tincture can also refer, among other things, to the colors used in a coat of arms or an herbal or medicinal solution. Origin and Etymology of tincture Middle English, from Latin tinctura act of dyeing, from tinctus, past participle of tingere to tinge