براغي رأس مقبس 1/4-28 × 2 بوصة | محرك سداسي | حبة نايلون | ملولبة جزئيًا | فولاذ سبائكي مؤكسد حراري أسود (100 / عبوة)

I needed some reliable fasteners for a jig I was building, and these 2" socket cap screws threaded in smooth and held tight. The black oxide finish looks clean and professional.

The nylon pellet lock is the real standout here—once I torqued them down on a fixture plate, they held position through a full day of vibration-heavy machining without a hint of backing off. The black oxide finish also gave them a nice, uniform grip right out of the bag, no galling on the threads.

Used a dozen of these to secure a jig fixture on my mill, and the hex socket drive made installation straightforward with a ball-end Allen key. The thermal black oxide finish seems durable and hasn't chipped during repeated adjustments.