Optionalsize: isoThreadSizeEnumOptionalunit: unitOfLengthEnumOptionalframe: Bit.Inputs.Base.FrameOptionalsizeThe thread size, such as M8.
OptionalunitThe unit the fastener is made in and its lengths are read in; the size names a metric thread whatever it is.
OptionalframeWhere it sits: the origin where it bears, as under a head, the normal along its axis away from the part. Left out, the ground, facing +Y.
An ISO 4032 hexagon nut for
parts.mechanical.fasteners.iso.hexNutand its twin with face roles: its size, the unit and where it bears.