HOLO-KROME 64066 3/8-16 X 5/8" 圓頭內六角螺絲 | 內六角驅動 | 合金鋼 熱處理黑色氧化 (50 顆/包)

The hex socket drive seated perfectly on my Allen key with zero wobble, and the black oxide finish has a consistent, professional look across all 50 pieces. I used them to secure a jig plate and they torqued down cleanly without stripping.

I needed a batch of 3/8-16 button heads for a jig I'm building and these fit perfectly. The hex socket drive makes them easy to tighten evenly, and the black oxide finish looks clean.

The black oxide finish on these screws makes them blend seamlessly with my tooling fixtures, and the hex socket drive held up perfectly under torque. They seated flush in my jig without any wobble—exactly what I needed for precision assembly work.