براغي ذات رأس أسطواني ومقبس سداسي M1.6-0.35 X 12mm | محرك سداسي | ملولبة بالكامل | فئة 12.9 فولاذ سبائكي مؤكسد أسود حراري (600/عبوة)

I was pleasantly surprised by how uniform the black oxide finish is across all 600 screws, making them ideal for my jig build. The threading is clean and consistent, fitting perfectly into my precision assemblies without any binding. Definitely a solid purchase for this size fastener.

I was worried the 12.9 alloy steel would be brittle at this tiny size, but they threaded cleanly into aluminum without snapping. The black oxide finish seems to hold up well against the light oil on my fingers during assembly.

Finally found small cap screws that actually have clean threads for M1.6—these cut cleanly into tight spaces without stripping. The black oxide finish looks good and seems to resist wear during assembly work.