I had a 1/4" deep socket fall off an extension into the engine bay the other day, which led me to try to find out why. So I spent a little while plugging the extension into different sockets, and the socket into different extensions, looking for where the slop was. And I found something strange about my 1/4" sockets. Take a look at this picture:

The two deep wells in the back row are from metric (HF) and SAE (USA Cman) sets respectively. Note the HF socket has a detent notch, and the Craftsman does not. None of my Craftsman 1/4" SAE deep wells have the detent, and all of the Pittsburgh do. I've had the Craftsman for probably 25 years and never noticed this.
The row in the front are USA Craftsman metric, bought as a set (I'm pretty sure) at the same time as the others, and they vary. 10mm, 9mm, and 5.5mm have a detent; the others do not. The ones that have a detent don't match the rest of the set; they have light knurling around the base. The 10mm also has what looks like a stamping defect, although it has never affected function.
Why do you suppose Craftsman would make sockets without ball detents? Or a mixed set where some have them and some don't?

The two deep wells in the back row are from metric (HF) and SAE (USA Cman) sets respectively. Note the HF socket has a detent notch, and the Craftsman does not. None of my Craftsman 1/4" SAE deep wells have the detent, and all of the Pittsburgh do. I've had the Craftsman for probably 25 years and never noticed this.
The row in the front are USA Craftsman metric, bought as a set (I'm pretty sure) at the same time as the others, and they vary. 10mm, 9mm, and 5.5mm have a detent; the others do not. The ones that have a detent don't match the rest of the set; they have light knurling around the base. The 10mm also has what looks like a stamping defect, although it has never affected function.
Why do you suppose Craftsman would make sockets without ball detents? Or a mixed set where some have them and some don't?

