HOLO-KROME 09021 10mm X 30mm 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 顆/包)

The precision-ground shoulder is spot on for a pivot application I'm working on, and the black oxide finish looks and feels solid out of the box. Fit in the bore was snug without any binding, just how I wanted it.

Finally found these at the exact dimensions I needed for a heavy-duty indexing fixture—the precision-ground shoulder fits the bearing bore perfectly. They’re pricey for a pack of 25, but the black oxide finish looks clean and they’ve held up through a week of 8-hour shifts without a hitch.

The precision ground shoulder makes these work beautifully as a pivot pin—no wobble or slop once torqued down. The black oxide finish looks sharp and hasn't chipped during assembly. I've already ordered another pack for the next project.