7/16-14 x 2-1/4" 內六角螺絲 | 平頭 內六角驅動 | 全螺紋 | 合金鋼 熱處理黑色氧化 (50 顆/包)

Installing these in a precision assembly felt smooth and precise—the hex socket drive bit seated perfectly without any cam-out. The black oxide finish seems durable enough for heavy use. A solid choice for tooling work.

The hex socket drive on these screws grips my Allen key perfectly without any stripping, even under heavy torque. They're holding a custom jig together on my mill without a hint of loosening.

I've been using a full box of these for building custom jigs at my shop, and the hex socket drive makes them much easier to tighten in tight spots than a standard hex head. They thread smoothly into pre-tapped holes without any binding.