براغي رأس مقبس 5/16-18 × 3 بوصة | محرك سداسي مسطح الرأس | ملولبة جزئيًا | فولاذ سبائكي أكسيد أسود حراري (100/عبوة)

I was a bit worried about the partially threaded design, but these screws held perfectly in a heavy jig I built last weekend. The black oxide finish looks clean and seems tough.

The hex socket drive seated perfectly on my torque wrench, and the black oxide finish looks great against the steel frame of my repair fixture. Used a dozen of them for a press tool assembly, and the partial threading held firm under load. Exactly the quality I needed for shop fixtures.

Bought these for a jig I'm building and the partial threading is perfect for clamping without bottoming out. The hex socket seated cleanly in my driver, no wobble, and the thermal black oxide looks sharp. Solid pack for the price.