Awl --
Sorta like a round coupling nut, tapped 1 3/4" through, axially. Will be drilled, rigid tapped on a fadal.
Had cut tapped these before, just wondering if form tapping would be better, what others would do. I know form tapping will require more clamping power, which is a minor minus. Coolant will be a MW-150 soluble oil. About 800 pcs.