براغي رأس أسطوانية M2.5-0.45 × 12 مم | رأس زر محرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 10.9 معالجة بأكسيد أسود حراري (900 / عبوة)

The black oxide finish on these 10.9 alloy steel screws looks properly done, no flaking or uneven patches after I torqued a few into a jig. The hex socket drive engaged cleanly with my driver, and all 900 threaded in without a single dud. Exactly what I needed for precision assembly work, and the pr

These little fasteners fit perfectly into the precision jig I’m building, and the black oxide coating gives them a clean, professional look. I was pleasantly surprised by how consistent the threading is across all 900 pieces.

I had to replace some worn-out fasteners on a 3D printer bed and these button head screws fit perfectly. The black oxide finish feels durable and the threads cut cleanly into the aluminum without any binding.