براغي رأس مقبس M4-0.7 × 12 مم | محرك مقبس سداسي | ملولبة بالكامل | فئة 12.9 من سبائك الصلب أسود حراري (900 / عبوة)

The black oxide finish on these M4 screws is uniform and tough—scraped one accidentally during assembly and no bare metal showed. They thread smoothly into tapped holes, and the hex socket engages perfectly without stripping. Exactly what I needed for a jig build.

Torqued down a few of these into an aluminum jig today—the black oxide finish slid right in without any galling. They're grade 12.9 so I feel confident they won't strip out under load. Solid little fasteners for the price.

Installed a batch of these in a custom jig yesterday, and the black oxide finish made them easy to handle without slipping. The 12.9 grade steel gave me confidence they’ll hold up under repeated clamping force.