Optionalsize: ansiThreadSizeEnumOptionalunit: unitOfLengthEnumOptionalframe: Bit.Inputs.Base.FrameOptionalsizeThe thread size, such as 1/4 or #10.
OptionalunitThe unit the fastener is made in and its lengths are read in; the size names an inch 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 ASME hex nut for
parts.mechanical.fasteners.ansi.hexNutand its twin with face roles: a machine screw nut to #12, a hex nut from 1/4, the unit and where it bears.