T-slot nuts

I think this one is Standard independent, besides small dimension Slot dimensions are defined by a Structural Code

Standard Slot Toasters · 65 Slices Output per Hour · Push Down Eject Lever · 4 mins Mechanical Timer · W260 x D210 x H220

slot canyon tours page az You can meet all of those standards fairly easy, with the exception of slot callout The center-line

slot drill bit Bracket slot height was measured with leaf gauges The height and width of 10 stainless steel archwires with dimensions either 0·019×0·022 or 0·