براغي مقبس نقطة كوب مخددة 1/4-28 × 1-1/4 بوصة | فولاذ سبائكي (100 / عبوة)

The knurled cup point bit into the shaft perfectly, holding tight even under heavy vibration. The alloy steel feels sturdy and well-machined, and the whole package of 100 saved me a trip to the hardware store.

The hex socket drive made installing these in a tight spot under my lathe's carriage surprisingly easy. They're definitely snug and feel high-torque enough for the vibration.

The knurled cup point on these screws really locks into place, making adjustments much more stable than standard set screws. I used them for a jig build and the alloy steel feels solid and precise.