Tool tip inserts are commonly specified using ISO references. These define things like tip radius, thickness, shape etc. One of the defined items is cutting length which is usually given the symbol L and is the length between one tip of the tool and an adjacent tip.
Now I would have thought all that eminently sensible until that is I order tips by the ISO reference and find they do not fit the tool holder. The reason is the cutting length is slightly longer which means the clamping screw hole is not centralised over its thread.
In my case the ISO reference was CCMT 060202 and the offending tip cutting length was 6.3 mm rather than 6mm. One tip I think is of American Manufacture and the other European. Of course 1/4" is 6.35mm ..... American! It's the 06 that is the offending reference that can apply to either cutting length, but the M reference does not change. (The M reference is the theoretical diameter of a circle that touches all cutting edges of the tip.)
Has any one else been caught out by this small difference and apparent inconsistent use of the ISO standard? Or have I misunderstood the application of the ISO standard?