براغي رأس كوب 5/16-18 × 3 بوصة | محرك سداسي | رقعة نايلون | ملولبة جزئيًا | فولاد سبائكي معالجة حرارية بأكسيد أسود (100 / عبوة)

I needed some heavy-duty screws for building a jig, and these 3-inch black oxide ones threaded perfectly into the 5/16-18 die. The hex socket drive made torquing them down easy without stripping the head. Really solid feel for precision work.

The nylon patch on these screws is a nice touch—they held firm on my milling fixture without any loosening. The black oxide finish looks clean and professional, too.

I needed some sturdy fasteners for a jig I'm building, and the nylon patch on these is a huge time saver—no more worrying about them backing out during use. The partially threaded design also gives me the right grip depth without wasting shank length.