M12-1.75 X 16mm ソケットキャップスクリュー | 六角ドライブ | 全ねじ | クラス12.9 合金鋼 サーマルブラックオキサイド (100/パッケージ)

Needed a few strong socket head bolts for a jig I was building, and these 12.9-grade screws fit the bill perfectly. The hex socket drive engaged without any stripping, and the threads were clean right out of the package.

The black oxide finish is even and uniform across all 100 pieces, so they look sharp in my precision fixture. Threads are clean and the hex socket seated a standard Allen key without any slop. These are exactly what I needed for a tight tooling assembly.

Installed these on a jig for a production run and the 12.9 alloy steel held up perfectly under heavy torque without any stripping. The 16mm length was just right for my application, and the black oxide finish still looks clean after a few weeks of use.