HOLO-KROME 61030 براغي رأس مقبس 5/16-24 × 1/2 بوصة | محرك سداسي مسطح الرأس | أكسيد أسود حراري من سبائك الصلب (100 / عبوة)

Threads are clean and the black oxide finish looks even across all a hundred pieces. The flat head sits flush in my tooling plates without any wobble. These are going to be my go-to for precision work from now on.

Used these for a jig I'm building and the flat head seating is perfect—countersinks flush every time. The thermal black oxide has a nice even coating that hasn't chipped even after some wrenching.

The black oxide finish gave these screws a clean, uniform look right out of the package, and the hex socket drive seated perfectly with my Allen wrench on the first try. Used a dozen on a jig fixture and they threaded in smooth without any binding or galling. Solid batch of 100 for the price.