Interface DesignHoleFastener (Models.OCCT)

A hole sized by the screw it takes, by standard: iso (the default), whose size is a metric thread from "M1.6" to "M24", or ansi, whose size is a Unified inch thread from "#0" to "1", coarse or series "UNF" fine (text, or { "expr" } so a parameter can choose it). fit is close, normal (the default) or loose for a clearance hole after ISO 273 or ASME B18.2.8, or tapped for a threaded hole at the thread's nominal diameter, whose walls are also named thread; and head socket for the counterbore a socket head cap screw takes: DIN 974-1's, its head height plus half a millimetre deep, or the inch one, its head height plus 0.02 inch deep. The hole is sized in the document's unit.