M3-0.5×10mm ソケットキャップスクリュー | フラットヘッド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個/パッケージ)

The hex socket drive seats perfectly on my Allen key without any wobble, and the black oxide coating looks uniform across all 600 pieces. I've used maybe 80 so far in a precision assembly and not a single stripped thread.

Installing these in a tight jig setup was smooth—the hex socket drive gripped perfectly without any cam-out. For precision assemblies, the fully threaded length gives excellent holding power. Solid fasteners at this price point.

The black oxide finish on these M3 screws looks professional and resists scuffs better than standard zinc ones I've used before. They fit perfectly into tapped holes on my 3D-printed tooling jigs, and the hex socket drive makes them easy to tighten without stripping.