براغي ذات رأس أسطواني مجوف HOLO-KROME 72298 5/8-11 × 7 بوصة | محرك سداسي مجوف | فولاد سبائكي مع أكسيد أسود حراري (10 / عبوة)

The black oxide finish on these screws looks sharp and seems to resist rust well, which I appreciate for tooling projects. The 5/8-11 thread seated cleanly and the hex socket drive gripped firmly without stripping, even at good torque.

I used these for a heavy-duty jig in my shop and the hex socket drive made installation straightforward. The 5/8-11 threads grabbed cleanly and the 7-inch length was just right for the assembly.

The black oxide finish on these screws handled my test clamp-downs without any galling, a nice surprise. Driving them into hardened steel jig plate with a hex key was smooth all the way. I've already ordered a second pack for my next fixture build.