5/8-18 X 1" 內六角螺絲 | 平頭六角驅動 | 全螺紋 | 合金鋼熱處理黑氧化物 (50入)

These fit perfectly in my milling machine's T-slots, and the black oxide finish looks like it'll resist rust well. The flat heads sit flush without any wobble, which is exactly what I needed for my jig setup.

The hex socket drive grabbed my Allen wrench cleanly on every single one of these, no stripped heads or wobble. I’ve used about 30 of them for a jig build and the black oxide finish looks great and held up fine so far. These are solid, well-made screws for the price.

I needed screws that wouldn't rust in my shop jig, and the black oxide finish on these seems really durable so far. The hex socket drive made installation a breeze with no stripping.