براغي مقبس ذات نقطة كوب مع رقعة نايلون 1/4-20 × 1-1/4" | فولاذ سبائكي (100/عبوة)

Finally, a set screw that stays put without constant retightening. The hex drive makes it easy to snug these into my workbench jig, and the nylon patch does exactly what it's supposed to.

Needed these for a jig I’m building, and the nylon patch actually holds them in place under vibration—no thread locker needed. The cup point bites nicely into the metal without slipping, even after repeated adjustments.

These screws came in a heavy-duty plastic case of 100, and the nylon patch is already holding tight even before I torque them down. The hex socket made it easy to adjust in a cramped spot on my mill, and the cup point bites solid.