براغي رأس أسطواني M4-0.7 × 20 مم | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي درجة 12.9 أسود حراري (600 / عبوة)

Used a full box assembling a custom jig frame and every single one threaded smoothly with zero binding. The hex socket holds the driver tight, which I appreciate when working in tight spots. For the price per piece at this size and strength, it's hard to beat.

The black oxide finish on these screws holds up well, and the hex socket drive made installing them in my jig a breeze. Exactly the right thread engagement for precision assemblies.

Was pleasantly surprised by the consistent thread quality across all 600 screws—every one seated smoothly into my jig without any binding. The black oxide finish feels durable and gives them a nice, uniform look. Exactly what I needed for reliable, repeatable precision assemblies.