Mutterstorlek

Mutterstorlek (nut size) is a term used in mechanical and fastener contexts to denote the size of a nut, typically defined by its internal thread diameter. In practice, mutterstorlek determines which bolt or stud the nut will fit. In Swedish and international catalogs, the size is most often given as a metric nominal size, such as M6, M8, or M10. The notation may include the thread pitch (for example M6 x 1.0), where the number after the x indicates how far the thread advances per turn. Coarse pitches are common for general use, while finer pitches are chosen for precision or load-control applications.

Standards and dimensions vary by nut type and standard. For metric nuts, ISO and national standards (such as DIN) define both the internal thread and the external dimensions. Hex nuts, flanged nuts, and other variants follow specific standard sizes for width across flats and thickness, ensuring compatibility with wrenches and with mating components. It is common to see the same nut size offered in different hardness grades or with additional features like locking or serrated surfaces.

Selecting and using mutterstorlek involves matching the nut to the bolt or stud. The nominal size should correspond to the bolt diameter and the thread pitch should match the bolt’s pitch. Tolerance classes (for example 6H for the nut’s internal thread) describe the fit between nut and bolt. Material and finish also influence suitability for the operating environment, load, and corrosion resistance.