If fitting to the 024, 026, MS260, MS280, etc… you will need the .325 pitch chain, so please let me know afterwards which type of chain you need, thanks.
The bar is a hard nose tip type bar and can run .325 or 3/8 pitch 063 gauge chain, if .325 will be 74 drive links long (chain at the top of the bar), if 3/8 will be 66 drive links (chain at the bottom of the bar).