براغي رأس أسطوانية مقاس 1-3/8-6 × 3-1/2 بوصة | قيادة سداسية | ملولبة بالكامل | فولاذ سبائكي بأكسيد أسود حراري

The black oxide finish on these screws matches perfectly with my other tooling components, and the hex socket drive makes them easy to tighten in tight spaces on my jig. Installed four of them on a precision assembly table today, and the threads cut clean without any binding.

The black oxide finish on these screws gave them a nice, consistent look against the steel jig I’m building, and they threaded in smoothly without any binding. Exactly the heavy-duty hold I needed for a tooling fixture.

These 13/8-6 screws fit perfectly into my milling machine’s jig, and the black oxide coating really resists the shop grime. The hex socket drive made installation a breeze with no stripping.