1-3/8-6 X 18" 內六角螺絲 | 六角驅動 | 部分螺紋 | 合金鋼熱處理黑色氧化

The black oxide finish on these screws gives them a clean, uniform look that made them easy to tell apart from my older hardware. The 18-inch length and partial threading worked perfectly for aligning my jig setup, and the hex socket drive gripped firmly without any stripping.

Installed these on a heavy-duty press jig and the hex socket drive made tightening them a breeze, even in tight spots. The black oxide finish seems tough and hasn't shown any wear after a few weeks of use.

I needed extra-long screws for a custom jig setup, and these 18-inch socket caps fit perfectly in my drill press table. The hex drive made tightening them into tight spots much easier than with a standard bolt.