M12 X 45mm 杯頭內六角螺絲 | 合金鋼 (50 / 包)

The cup point bit into the shaft exactly where I set it, and the 45mm length gave me plenty of thread engagement for a solid hold. These alloy steel screws torqued down smoothly without any stripping, and the hex socket drive made positioning them in a tight corner a breeze.

Finally some set screws that don't strip out after one use; the hex socket drive gives me great torque in a cramped motor mount. The cup point really bites into the shaft without slipping.

The cup point bites into the shaft well, so these hold securely even under vibration. Alloy steel feels plenty tough for general fastening jobs, and the 45mm length worked perfectly for my fixture. Only minor gripe is that the hex socket could be a tiny bit deeper for easier bit engagement.