M20-2.5 X 110mm ソケットキャップスクリュー | 六角ソケットドライブ | 部分ねじ | クラス12.9 合金鋼 サーマルブラックオキサイド (25本/パック)

The black oxide finish is exactly what I wanted for tooling fixtures—no glare under shop lights and it holds up without any rust so far. The hex socket drive seated cleanly on my driver, and the partial threads gave me the clamping grip I needed on a precision assembly. Honestly, the 12.9 hardness m

These bolts threaded perfectly into my jig without any binding, and the hex socket drive made installation with an Allen key effortless. The 12.9 alloy steel feels incredibly sturdy for heavy-duty clamping, which is exactly what I needed.

The black oxide finish looks sharp in my tooling setup, and the partial threading gives me just the right grip length for clamping. These 12.9 alloy screws have held up through repeated torque with zero stripping on the hex socket.