براغي رأس أسطواني M12-1.25 × 25 مم | محرك سداسي | خيط كامل | فولاذ سبائكي فئة 12.9 معالجة حرارية بأكسيد أسود (100 / عبوة)

Put these on a heavy-duty jig I'm building, and the black oxide finish gave them a clean, uniform look right out of the bag. The hex socket drive seated perfectly with my Allen key, and the full threading made them easy to cinch down tight.

I was worried about finding Class 12.9 bolts for my jig project, but these socket cap screws have the exact hardness I needed for clamping force. The black oxide finish is consistent across all 100 pieces, which saved me from sorting through rejects.

Thread engagement is perfect on these bolts—the 25mm length fits flush in my jig plate without protruding. The black oxide finish seems durable and should resist minor rust during storage.