براغي ذات رأس أسطواني 1-3/8-6 × 4-1/4 بوصة | محرك سداسي | ملولبة جزئيًا | فولاذ سبائكي مع أكسيد أسود حراري

Used a full box of these mounting jig brackets on a steel frame and not one stripped or snapped during torquing. The black oxide finish held up nicely against shop grime, and the partially threaded length gave just the right grip for thick flanges. Solid choice if you need screws that behave under r

The partially threaded design made it easy to get a firm grip during installation, and the black oxide finish adds a nice layer of corrosion resistance. These screws feel solid and are working perfectly in my jig setup.

I needed a longer cap screw for a fixture I was building, and the partially threaded section on these made alignment much easier than dealing with a fully threaded bolt. The black oxide finish also gives them a clean, professional look on the tooling.