براغي رأس مقبس | 5/16-18 X 1-5/8" | رأس مسطح محرك سداسي | كامل الخيط | فولاذ سبائكي أكسيد أسود حراري (100/عبوة)

I was pleasantly surprised by the finish on these—the black oxide coating is even and seems durable, giving them a nice grip when torquing down. They seated perfectly flush in my drill jig without any binding issues.

Picked up a pack for a custom tooling project, and the flat head sits flush perfectly in counterbored holes. The black oxide finish feels durable and hasn't chipped during installation. Exactly the quality I needed for precision assemblies.

The hex socket drive seated perfectly with my Allen wrench, and the thermal black oxide finish looks clean and professional on the jig I built. All 100 screws came threaded smoothly with no burs, which made assembly a lot faster than I expected.