The 3 numbers used to describe a tip size, example 517, refers to the fan size and the orifice size.
The fan size of a 517 is 10 inches wide, one foot from the surface being sprayed. The first number is always ½ the actual fan width. The last 2 numbers refer to the actual size of the orifice. These numbers represent thousandths of an inch, example 517 is .017 inches.
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