General product naming conventions are as follows:

GMBW = Guaranteed Minimum Bandwidth

Occasionally there will be an additional ending to the part number after the diameter/dimensions are called out.  The addition of a "-D" indicates that a part is unmounted.  In this case, the diameter of 25 means that diameter of the glass substrate is 25mm.  The addition of a "-N" calls for a part to be unmarked and will not include the Semrock logo, part number, or arrow to indicate the proper orientation.

In the case of a multiband or multi-notch filter, the multiple bands will be called out in an xxx/yyy format, as in this multiband dichroic:

For those parts who have multiple grades available for purchase, the grade is specified in this way:

The following is a guide to help you correlate part numbers and product families.  It is not intended for users to create part numbers.