براغي رأس أسطوانية 1/2-13 × 1-3/4" | محرك سداسي | بليت نايلون | ملولبة بالكامل | فولاذ سبائكي مؤكسد أسود حراري (50 / عبوة)

Used these to build a custom jig for a production run, and the nylon pellet locking feature really held the screws tight under heavy vibration. The hex socket drive made install quick even in tight spots. Exactly what I needed for my tooling setup.

I needed a solid lock for a jig I'm building, and these screws fit the bill perfectly. The black oxide finish looks good and should resist corrosion during daily shop use.

The nylon pellet locking feature is a nice touch—these hold their torque far better than plain black oxide screws I've used before. The 1/2-13 threading was clean all the way down, seated perfectly through my jig plates without any binding.