Base tap ISO M3.5x0.6mm 60 ° metric thread

Slotted pins are used for nuts (hung screw). There are three types: pointed pin, intermediate pin and base pin, each with its own shape. You start with the point tap, it cuts threads, but not to full depth. Then you take a trip with the intermediate pin that cuts deeper, but still not in full depth. And finally, you finish with the end pin that cuts in full depth.