براغي رأس مقبس HOLO-KROME 72388 1-8 X 5-1/2 بوصة | محرك مقبس سداسي | فولاد سبائكي مع أكسيد أسود حراري (10 / عبوة)

Had to swap out some worn bolts on a milling jig, and these fit the 1-8 thread perfectly with no wobble. The alloy steel feels dense and machined precisely, and the black oxide coating held up fine under the wrench torque.

The black oxide finish on these screws looks great and feels durable. I used them to secure a precision assembly fixture, and the hex socket drive seated perfectly without stripping.

Used these for a jig I was building, and the black oxide finish held up perfectly without any galling during tightening. The 5-1/2" length was exactly what I needed for a thick fixture plate.