HOLO-KROME 42043 براغي ضبط تجويف سداسي بنقطة كوب محززة 5/16-18 × 1/2 بوصة | فولاذ سبائكي أكسيد أسود حراري (100 / عبوة)

The knurled cup point really digs in tight on my shaft collar, no slipping at all. These hex socket drivers fit perfectly with my Allen wrench, made installation quick and clean.

I needed these for securing a pulley on a motor shaft, and the knurled cup point really bites into the metal without slipping. The black oxide finish gives them a nice, consistent look, and all 100 pieces in the package were cleanly threaded.

The hex socket drive fits perfectly, and the black oxide finish gives them a clean, professional look that resists wear well. I used these to secure a gear on a shaft, and the knurled cup point held tight without slipping. Exactly what I needed for a solid mechanical connection.