براغي ذات رأس أسطواني 9/16-18 × 5-1/2 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أكسيد أسود حراري (10 / عبوة)

Thank god, these are actually 5.5 inches of solid threads, not just over the head. The black oxide finish wiped clean with a rag, no oil mess, and they seated perfectly in my jig plate.

The hex drive fit my torque wrench perfectly, no stripping or wobbling even under heavy load on a jig fixture. These 5-1/2" screws feel solid and the black oxide finish looks clean on my assembly table.

For a 5-1/2" fastener this long, the fully threaded design is a lifesaver—no guessing how much grip you're getting. The black oxide finish felt tough and consistent across all ten pieces, and they seated cleanly in my jig without any wobble.