1/4-20 x 2-3/4" 內六角螺絲 | 平頭內六角 | 部分螺紋 | 合金鋼熱處理黑氧化物 (100個/包)

These screws mated perfectly with the T-nuts I use on my fixture table, and the black oxide finish looks nice and durable. The partial threading gave me just the right grip length for my 3/4" plywood assembly.

I needed some longer screws for a jig I’m building, and these partially threaded ones give me just the right amount of grip without bottoming out. The black oxide finish feels sturdy, and the hex socket lets me torque them down without stripping.

The flat head sits perfectly flush in my fixture plates, and the black oxide finish has held up through a week of shop use without a hint of rust. The hex socket drive grabbed cleanly with my Allen key, no stripping at all.