①,Nuts shall be furnished without a hole, unless specially ordered by the purchaser. In some applications it may be desirable to assure that the threaded parts joined by a coupling nut are each engaged to approximately one-half nut thickness. As a visual inspection aid, a hole drilled through one side of the nut is recommended. The hole should be located at mid-nut thickness, and have a diameter of 0.2 to 0.4 times nominal nut size for sizes 2½ in and smaller, and 1 in for sizes 2¾ in and larger.
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![Hexagon Nut, C, [Table 18-19]](https://imgcc.164580.com/upload/48/pic/2021/04/26/1619414682026026175.jpg)
