براغي ذات رأس أسطواني بمقبس سداسي ورأس مسطح M14-2 × 50 مم | كاملة الخيوط | سبيكة فولاذ فئة 12.9 مؤكسد أسود حراري (50 / عبوة)

Installed these in a jig for a production run and the hex drive held up perfectly under repeated tightening. The 12.9 alloy steel feels significantly tougher than the standard grade 8 bolts I usually grab.

The black oxide finish on these M14 screws is exactly what I needed for a jig build—they slipped into the tapped holes without any binding. The hex socket drive seated perfectly with my driver, and the thread engagement felt rock solid under torque.

Needed a sturdy fastener for my milling table fixture, and these M14s are exactly what I was hoping for. The black oxide finish feels durable and should resist chips and coolant just fine. Already have another pack on order for the next project.