HOLO-KROME 76140 براغي ذات رأس أسطواني M5-0.8 × 40 مم | محرك سداسي | سبيكة فولاذ معالجة حرارياً بأكسيد أسود (100 / عبوة)

The black oxide finish on these M5 bolts is really tough and hasn't chipped at all during repeated use in my jig assembly. They fit perfectly into the hex socket drive without any stripping, and the 40mm length was exactly what I needed for securing some aluminum parts.

Needed 40mm bolts for a custom tooling fixture and these threaded in cleanly with no binding. The black oxide finish looks tough and consistent across all 100 pieces.

For a recent jig build, the 40mm length was exactly what I needed to reach through thick brackets, and the black oxide coating feels more durable than standard zinc. The hex socket drive bit snugly, making assembly quick.