Interleaved 2 of 5 is a numeric-only barcode that is widely used in warehouse and industrial applications. It is also called ITF-14/SCC-14.

The symbol can be as long as necessary to store the encoded data. The code is a high-density code.

The symbol is called "Interleaved" because a digit is encoded in the bars and the next digit is encoded in the spaces. There are five bars, two of which are wide; and five spaces, two of which are wide. Since the characters are interleaved in pairs, the barcode has to contain an even number of digits. If the barcode value contains an odd number of digits, Barcode Xpress adds a leading "0" to the value.

Interleaved 2 of 5 requires a quiet zone, which should be at least the width of 10 narrow bars. This means that if you set the MakeBarcodeBarSize property to 3 pixels (narrow bar size), you should set the MakeBarcodeBWidth property to 30 pixels.

Since Interleaved 2 of 5 is a self-checking barcode, it normally does not require a checksum. However, when necessary, an optional modulo 10 checksum may be used. By default, Barcode Xpress will not write optional checksums. If a checksum is desired for Interleaved 2 of 5, set the BarcodeAppendCheckSum property to True and Barcode Xpress calculates and writes the checksum.