HOLO-KROME 09052 16mm X 80mm 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 合金鋼熱處理黑氧化物 (25個/包)

Used one as a pivot pin for a jig I welded up, and the precision ground shoulder kept everything dead true through a full day of heavy use. The black oxide finish held up nice against shop grime and didn't gum up the hex socket. Honestly, these are the kind of screws you install and forget about.

I needed a shoulder screw for a custom jig and these 16x80mm ones fit perfectly as an axle in my assembly. The hex socket drive made installation straightforward with an Allen wrench.

The precision ground shoulder on these screws made aligning my jig so much easier than with standard bolts. They fit snugly into the bearing I needed them for, and the black oxide finish looks clean. Definitely worth the price for the pack of 25.