The designation follows ISO 5608 and is the same for every maker. After the insert size a maker may add letters of its own, for instance for internal coolant or special shanks: read those in its catalogue.
Inserts it takes
It takes DNMG inserts, size 15: the pages below explain each one. Grade and chipbreaker are chosen from the catalogue, by material.
The left-hand version is DDJNL 2525M15: same insert and size, mirrored. Right or left depends on the feed direction and on how the tool sits on the turret.
What it is for
Style J has a 93° cutting edge angle (side cutting): it is used for copying and profiles.
Designation to ISO 5608 (toolholders) and ISO 6261 (boring bars); cutting edge angles as in the ISO 5610 standards. No maker has approved this page: the catalogue is what counts.
What problem it solved, how much time it saves you, what is missing. We read everything. We only publish with your permission, and only the way you choose.
Thank you. We have it: if you allowed publishing, we will write to you to confirm before it goes online.