براغي رأس سداسية مقبس 3/8-16 × 2-3/4 بوصة | رأس مسطح محرك مقبس سداسي | جزئية الخيوط | فولاذ سبائكي معالجة حرارية بأكسيد أسود (50/عبوة)

The black oxide finish on these screws looks sharp and held up fine during assembly, no chips or uneven coating. The partial threading seated cleanly into my jig fixture, and the hex socket drive gripped firmly without stripping. Exactly what I needed for a solid 50-piece lot.

I used these on a custom jig I’m building, and the partial threading made aligning them in tight spots much easier than I expected. The black oxide finish looks clean and seems durable.

The hex socket drive seated perfectly with my Allen key, and the thermal black oxide finish looks sharp on the jig I built. Partially threaded design held my fixture tight without any wobble, and all 50 came clean and burr-free.