Square drive socket - loosening prevention

[Wuzhee]

Hi there!

I'm wondering how they are manufacturing the groove inside the square socket of hand tools?
I'm familiar with the through hole versions and their dimensions (https://www.engineersedge.com/hardware/square-drive-tools.htm), but I haven't found anything on the groove sizes and methods.

Which one would you prefer manufacturing wise? Ease and cost are the important factors.

 

[lucky-guesser]

Which groove exactly are you referring to? That little dimple or the one that runs down the length of it?

Either way, it's just live tooling on the C-axis of the lathe. Goes in on the Z axis and moves laterally on the X to make the cut.