HOLO-KROME 08020 5/16" x 5/8" 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 合金鋼熱處理黑色氧化 (25個/包)

The precision ground shoulder is dead-on for a pivot application I'm working on, and the black oxide finish has held up well against minor handling. Needed a hex key to seat them properly, but once torqued down they feel rock solid.

I needed a precise shoulder for a custom jig's pivot point, and these screws fit that role perfectly. The hex socket drive made installation simple with no stripping, and the black oxide finish looks clean and professional.

The hex drive seated perfectly on my wrench, and the black oxide finish gave them a clean, uniform look right out of the pack. Used a few as pivot pins on a jig, and the precision ground shoulder turned smoothly without any wobble.