I am pretty sure they use .250 thk stock and if the other knives were thicker it was because of the coating, also keep in mind the other blades that you are referring to have a saber grind on them and the grind doesnt start at the top of the spine, these are full flat grind and the grind goes all the way to the spine. Material thicknesses also carry a tolerance to them and not all are exactly .250 thick