M5 X 18mm 杯頭內六角止付螺絲 | 合金鋼 鍍鋅 (500個/包)

The cup point bites into the shaft way better than I expected, no slipping even under heavy torque. Hex socket drive made tightening in a cramped spot a breeze, and all 500 arrived clean and rust-free.

Bought these for a machine build and the cup point bites into the shaft way better than the flat-tip screws I had before. The zinc coating looks uniform across all 500, so no rust worries so far. Torqued one down hard in a tight spot and the hex socket held up without stripping.

The hex socket drive made installing these into my metal brackets a breeze, even in tight corners. They held firm under a lot of torque without stripping, and the cup point tip seated perfectly flush.