براغي ضبط رأس مقبس نقطة كوب 1/2-13 × 4-1/2 بوصة | فولاذ سبائكي (50/عبوة)

These set screws bit into the shaft much better than I expected—the cup point really holds tight under vibration. Perfect for locking a sprocket in place where I couldn't get a hex key in easily.

I needed to secure a shaft collar in a tight motor assembly, and the cup point on these grabbed perfectly without slipping. The 4-1/2-inch length gave me plenty of reach, and all fifty screws were uniformly threaded.

The hex socket drive made torquing these down in a cramped spot surprisingly easy, and the cup point bit into the shaft exactly as intended. All fifty of them showed up clean and uniform, threads and points both perfect, which is all I really ask for from a box of set screws.