①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. ②,Sizes 9/16, 5/8, and, 3/4 are for machine screws only. ③,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. ④,Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than those for slotted round heads. |