What Head Size should I choose?
In selecting a head size, the largest head capable of accessing the cavity or bore and making the required cut is generally the best choice, in terms of durability and rigidity of the head. The larger the head, the larger the bearings, gears and tool holding capacity.
The exception might be if you anticipate the head will not be dedicated to the specific application you are considering at the moment and the nature of your work tends to be smaller. If a smaller head would be more valuable to you overall and still capable of accomplishing the task at hand then it might be a better long term choice.
Head size selection can be determined by the MBS (Minimum Bore Size) and MTC (Maximum Tool Clearance) as given in the “Sizes and Dimensions” section of the website. However, we can sometimes “shave a little off” a head so give us a call if moving up to the next largest head size is marginal.