M30-3.5×300mm 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

The black oxide finish on these M30 socket screws gave them a nice, uniform look, and they threaded smoothly into my fixture plate without any binding. I was worried about the partially threaded length, but it turned out to be perfect for the steel brackets I was assembling. Solid feel all around fo

Used these to bolt down a heavy jig on our mill table and the 12.9 hardness held up perfectly under repeated clamping. The hex socket drove smoothly without rounding out, and the partial thread gave just the right grip depth for our application.

The black oxide finish on these screws is holding up perfectly in my tooling fixture, no rust after weeks of use. The hex socket drive made installation straightforward with a standard Allen key. Exactly what I needed for precision assembly work.