M5-0.8 X 14mm 內六角螺絲 | 平頭六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑色氧化 (600個/包)

The flat heads sit flush on my precision assembly jigs, and the hex sockets haven't stripped once. The black oxide finish looks solid and hasn't rusted in my damp workshop.

I've been using these for jig builds and the hex socket drive makes installation much easier than Phillips heads. The black oxide finish has held up well in a tooling fixture I left in a damp garage overnight.

Took a chance on a 600-pack for my precision assemblies and the black oxide finish is consistently smooth across every single screw. The hex socket drive seats perfectly with no stripping even at 12.9-grade torque. Solid value for a shop that burns through fasteners daily.