براغي ذات رأس أسطواني HOLO-KROME 720001498 5/16-18 × 5-1/2 بوصة | محرك سداسي | سبيكة فولاذ معالجة حرارياً بأكسيد أسود (5 / عبوة)

Just used these for a jig on my milling table and the hex drive grabbed perfectly without any cam-out. The 5-1/2" length was exactly what I needed for that deep fixture.

The black oxide finish on these screws held up great during assembly, no galling or stripping on the hex socket. Threads engaged smoothly into my jig and they tightened down solid with no wobble. Exactly what I needed for a precision fixture.

The 5-1/2" length was perfect for the jig I’m building, and the hex socket drive made tightening them in tight spots a breeze. Only minor gripe is the black oxide finish smudges a bit on your fingers during install, but they hold firm once torqued down.