HOLO-KROME 08014 1/4 X 1-1/2 英吋內六角肩螺絲 | 內六角頭 | 內六角驅動 | 合金鋼熱處理黑氧化 (25 顆/包)

I needed a precision shoulder for a small indexing fixture, and these screws slid into the bearing bore with almost zero play. The thermal black oxide finish seems durable so far, and the 25-pack gives plenty of spares for future projects.

The hex drive fits snug and the black oxide finish looks great. These shoulder screws will work perfectly for a precision pivot application.

Had to swap out a seized bearing on a piece of shop equipment, and the precision ground shoulder on these screws made for a perfect pivot point. The hex socket drive grabbed tight with no stripping, and the black oxide finish hasn't shown a speck of rust yet.