M3-0.5 X 16mm ソケットキャップスクリュー | 六角ソケットドライブ | 全ねじ | クラス12.9合金鋼 サーマルブラックオキサイド (600本/パッケージ)

I've been using these screws for mounting brackets on a custom jig and the hex socket drive makes them much easier to install in tight spots than a standard Phillips head. The 12.9 alloy steel feels noticeably tougher than the 10.9 grade I used before.

The black oxide finish on these M3 screws really resists wear during repeated adjustments on my machining fixtures. Each one threaded smoothly into tapped aluminum without any binding, and the hex socket drove perfectly with a standard driver. Exactly what I needed for precision builds.

Pulled these out for a precision jig setup and the hex socket drive engages perfectly without stripping. They fit tightly into tapped holes—the 12.9 grade really feels stronger than the standard ones I've used before.