براغي رأس تجويف M5-0.8 × 55 مم | محرك تجويف سداسي | خيط جزئي | فولاذ سبيكة درجة 8.8 بأكسيد أسود حراري (300/عبوة)

Finally found some M5 socket screws with enough length for my custom jig setup—the 55mm threaded portion left plenty of grip. The black oxide finish feels nicely durable and hasn't chipped during assembly.

Fit perfectly on my milling machine's T-slot clamps, and the thermal black oxide finish seems much tougher than the plain steel screws I've used before. The hex socket drive made installation quick with an Allen key—no stripped heads this time.

Used these for a jig fixture at work, and the 55mm length was exactly what I needed for the thicker plates. The hex socket drive made tightening them into tight spots much easier than a standard bolt.