M4-0.7 X 30mm براغي ذات رأس أسطواني | محرك سداسي | جزئي الخيط | فئة 12.9 سبيكة فولاذ مؤكسد أسود حراري (600 / عبوة)

The hex socket drive bites perfectly with my Allen key, no stripping even at high torque on the fixture I built. Six hundred pieces for this price is a solid deal, and the black oxide finish looks clean on the jig frame.

The partially threaded design made these screws much easier to align in my jig setup than I expected. Each one feels solid in the hand, and the black oxide finish gives them a clean, professional look.

The black oxide finish on these is perfectly even, and the hex socket drive seated my Allen key without any wobble. I used them to bolt down a steel mounting plate and the 12.9 alloy steel feels rock solid.