براغي ذات رأس أسطواني 1-1/2-12 × 4 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أكسيد أسود حراري

I needed heavy-duty fasteners for a jig I'm building, and these socket cap screws threaded in smoothly with no binding. The thermal black oxide finish looks durable and should resist corrosion well in my shop environment.

Used these to rebuild a hydraulic press jig at work, and the hex socket drive made installation in tight spots a breeze. The black oxide finish held up well against the hydraulic oil during the first few cycles.

The black oxide finish on these screws gives them a nice, professional look that really resists corrosion. I used a set to repair a jig in my shop, and they threaded perfectly without any binding. Solid purchase for anyone needing heavy-duty fasteners.