M16-2 X 190mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼 熱處理黑色氧化 (10個/包)

Tensioning the bolts on a press die set was much smoother with these—the hex socket gripped perfectly without any cam-out. The 190mm length gave me just enough thread engagement for a thick fixture plate without bottoming out.

The black oxide finish on these M16 screws gives them a nice, uniform look, and the hex socket drive seated perfectly with my Allen key without any stripping. I used them for a heavy-duty tooling fixture and the 12.9 alloy steel feels rock solid under tension. Exactly what I needed for precision ass

I needed some heavy-duty fasteners for a jig I'm building, and the 12.9 alloy steel on these feels incredibly hard and durable. The hex socket drive engaged perfectly with my allen key, giving a solid, slip-free grip. My only tiny surprise was the thermal black oxide finish is more matte than I expe