1/4-20 x 2-1/2" 內六角圓頭螺絲 | 平頭內六角驅動 | 全牙 | 合金鋼熱處理黑色氧化 (100/包)

The black oxide finish on these seems like it’ll hold up well in my tooling jigs without rusting. The hex socket drive made installation straightforward with just an Allen key. Exactly what I needed for a precise assembly project.

Finally got around to building a custom jig for the drill press and these flat head screws sit perfectly flush. The black oxide coating held up well against metal shavings without any scratches.

Used a full bag of these on a fixture table build and not a single one stripped or fought me during install. The black oxide finish looks sharp and the threading is clean enough to start by hand every time.