براغي رأس مقبس 7/16-14 × 3 بوصات | محرك مقبس سداسي | رقعة نايلون | خيط جزئي | فولاذ سبائكي مؤكسد أسود حراريًا (50 / عبوة)

Used a full box mounting a tooling fixture and every screw seated cleanly, no galling on the hex drive. The thermal black oxide finish held up nicely against a little coolant splash, and the nylon patch kept them snug without needing thread locker.

The nylon patch on the threads is a nice touch—it held tight on my milling fixture without any need for threadlocker. The black oxide finish feels smooth and looks properly heat-treated, nothing like cheap hardware.

The nylon patch makes these hold tight without needing extra threadlocker, and the black oxide coating looks clean on my press tool. Threads meshed smoothly into the tapped hole right out of the package.