براغي رأس أسطوانية M5-0.8 × 20 مم | محرك سداسي منخفض الرأس | ملولبة بالكامل | فولاذ سبائكي كلاس 10.9 أسود حراري (400/عبوة)

The black oxide finish on these screws looks professional and seems durable—no nicks after installing a batch into a steel fixture. Threads ran smooth with a hex key, and the low head profile was perfect for a tight clearance spot on my assembly.

Bought these for a jig I’m building, and the black oxide coating gives them a nice uniform finish that doesn’t glare under work lights. The low head profile is handy in tight spots, though I wish the hex socket was a touch deeper for easier engagement on the last few turns.

Thread engagement feels solid and consistent across all 400 pieces, which is exactly what I needed for jig assembly. The black oxide coating seems durable so far, though I wish the hex socket was a hair deeper for better bit grip.