براغي رأس مقبس 3/8-16 × 1-5/8 بوصة | محرك مقبس سداسي | ملولبة بالكامل | فولاذ سبائكي معالجة حرارية بأكسيد أسود (100 / عبوة)

These are exactly the right spec for jig work. The hex socket drive is clean and the threads cut smooth without any binding. Exactly what I needed for a precision assembly project.

I was worried the black oxide finish might rub off during assembly, but after installing a dozen of these into my press tooling, they look as good as new. The hex socket drive seated perfectly with no cam-out.

I needed some heavy-duty screws for a jig I was building, and these 3/8-16 x 1-5/8" socket cap screws fit perfectly. The hex socket drive made installation straightforward with my Allen key, and the black oxide finish adds a nice, durable look.