HOLO-KROME 72258 براغي ذات رأس مقبس 1/2-13 × 6-1/2 بوصة | محرك مقبس سداسي | فولاذ سبائكي مع أكسيد أسود حراري (10 / عبوة)

I needed screws that could handle the torque on my milling jig without stripping, and these alloy steel ones with the hex socket drive gripped the driver perfectly during assembly.

Installing these in a jig for a precision assembly and the hex drive handled the torque without stripping. The 6-1/2" length was exactly what I needed to reach through multiple layers.

The thermal black oxide finish has held up great on my machine fixture after a week of daily use, no rust spots where I gripped them with oily hands. Socket drive bites cleanly with a hex key, and all ten threads ran smooth into my tapped holes.