1" X 1 3/4" 內六角肩螺絲 | 內六角頭 | 內六角驅動 | 18/8 不鏽鋼 (10/包)

These are my go-to for axles on small mechanical builds now, and the precision-ground shoulder makes the fit feel almost like a custom-machined part. The stainless finish holds up well without any of the rust I've seen on cheaper zinc options.

I needed a solid pivot for a jig I'm building, and these shoulder screws fit perfectly into the bearing surfaces—the precision-ground shoulder is noticeably smooth.

I was a little worried about finding proper pivot bolts for a small machinery project, but these turned out to be exactly what I needed. The hex socket drive made installation straightforward, and the 18/8 stainless finish looks clean and won't rust.