براغي رأس أسطوانية M14-1.5 × 40 مم | محرك سداسي | ملولبة بالكامل | فئة 12.9 من سبائك الصلب أسود حراري (50 / عبوة)

These bolts torqued down smoothly into my jig setup without any hint of stripping or galling. The black oxide finish is consistent across all 50 pieces, so they look clean and professional.

The black oxide finish on these socket cap screws resisted oil and grime much better than plain steel ones I've used before, and the hex drive seated perfectly with my Allen key. The 40mm length was exactly what I needed for a heavy-duty fixture repair.

Used them to hold a jig together on the mill and the black oxide finish looks sharp while resisting rust from the coolant. Threads were clean and seated smoothly, and the 12.9 hardness gives me confidence they won’t strip under heavy torque.