1/4-20 x 2-1/2" 內六角螺絲 | 六角孔驅動 | 尼龍防鬆膠 | 部分螺紋 | 合金鋼熱處理黑氧化 (100顆/包)

The black oxide finish on these screws handled the moisture in my workshop without any rust, and the hex socket drive made them easy to torque down with my Allen wrench. They held securely in my jig build, and the partial threading provided plenty of grip.

The nylon patch is a game changer for my precision assemblies—these screws hold their torque even under vibration, and the black oxide finish looks sharp on my jigs. Thread engagement is smooth right out of the bag, and the partial threading gives just the right grip length for thicker plates.

I was replacing some worn jig hardware and these black oxide cap screws threaded in smooth and held tight. The nylon patch is a nice bonus too—no loosening after a full day of vibration.