HOLO-KROME 0800994 5/8" x 3/4" 內六角肩螺絲 | 內六角頭 | 六角驅動 | 合金鋼熱處理黑氧化物 (25 個/包)

The precision ground shoulder on these screws is exactly what I needed for a smooth bearing surface on my jig. They fit perfectly into the assembly with no wobble, and the black oxide finish looks great. Great quality for the price.

The hex socket drive made installation straightforward with standard tools, and the precision ground shoulder fit perfectly as a pivot point on my jig fixture. These feel much more robust than the generic shoulder screws I've used before.

Finally found replacement shoulder screws for a custom jig build and these fit the precision ground shoulder perfectly. The black oxide finish on the alloy steel gives them a nice, durable look that should resist any shop grime.