M16-2 x 150mm 內六角螺絲 | 平頭內六角驅動 | 半螺紋 | 10.9級合金鋼 熱處理黑色氧化 (10顆/包)

The hex socket drive grips my Allen key perfectly, no stripping or wobble even when I torqued them down on a fixture plate. The black oxide finish has a nice, even sheen and they threaded cleanly into tapped holes on the first pass. These are exactly what I needed for the precision jig assembly.

I used these on a heavy jig build and the hex socket drive seated perfectly with no stripping. The black oxide finish seems durable so far and the 10.9 alloy steel should handle the load just fine.

The partially threaded shaft on these M16 screws made aligning my jig fixture much easier than with fully threaded bolts. The black oxide finish looks clean and professional on the machine tooling.