5/16-24 x 1-1/2" 低頭六角螺絲 | 低頭六角驅動 | 合金鋼 熱處理黑氧化物 (100顆/包)

The black oxide finish on these screws really holds up well in my jig setup—no rust after weeks in a damp shop. They drive cleanly with a hex key, and the low head clears tight spaces perfectly. Exactly what I needed for precision tooling work.

Exactly the low-profile head I needed to clear a tight clearance on my tooling fixture. The black oxide finish looks consistent and clean.

The black oxide finish on these screws gives them a nice consistent look, and the low head profile made them fit perfectly in my jig where standard cap screws were too tall. They seated cleanly with a hex key and held firm in the assembly.