براغي ذات رأس أسطواني مجوف 1/2-20 × 2-1/4" | محرك سداسي داخلي | حبيبات نايلون | ملولبة جزئيًا | فولاذ سبائكي مؤكسد أسود حراريًا (50 قطعة/عبوة)

These are going to be my go-to for jig work now, the partially threaded design gives me just the grip I need on the fixture plate. The hex socket drive seated perfectly on my driver and the thermal black oxide finish is already holding up well under shop oil.

The black oxide finish looks proper and hasn't flaked off during assembly. These 1/2-20 screws seated cleanly into my jig’s tapped holes, and the hex socket drive held the allen key without stripping.

I needed some strong screws for a custom jig I’m building, and these 1/2-20 x 2-1/4" socket cap screws with the hex drive were exactly what I was looking for. The nylon pellet locking feature really impressed me, keeping everything tight during assembly.