M16-1.5 X 35mm 內六角圓頭螺絲 | 六角插座驅動 | 全螺紋 | 12.9級合金鋼熱處理黑色氧化 (40 / 包)

I was a bit worried about the thread quality on these, but they threaded smoothly into the jig with no binding at all. The hex socket drive made installation straightforward, and the 12.9 alloy steel gives me confidence they'll hold up under heavy use.

The black oxide finish is a nice touch—these M16s slide into my tooling block with zero binding, and the 12.9 alloy steel feels properly rigid for the torque I’m applying. This batch came spotless, threads are clean, and the hex socket drive engages firmly every time. Exactly what my precision assem

Used these for a jig I was building, and the black oxide finish held up perfectly under clamping pressure without any galling. The hex socket drive made installation quick with an Allen key since the heads are recessed. Threads engaged smoothly the whole way, which I appreciated for 40 pieces.