5/16-24 X 1/2" 杯端內六角止付螺絲 | 合金鋼鍍鋅 (250 顆/包)

I needed a hex socket drive for tight spaces and these worked perfectly, turning smoothly with my Allen wrench. The cup point held strong on a steel shaft with no slipping even under vibration. Fast shipping and exactly the thread I ordered.

The cup point bites into the shaft much better than the flat-tip screws I’ve used before, so nothing’s worked loose on my fixture even with some vibration. For a 250-count box at this price, the zinc plating looks consistent across all of them and the hex sockets are cut clean, which makes a differe

Installing a new jig on my mill drill, the hex drive grabbed perfectly without stripping. These cup points seat flush and hold firm even under heavy vibration.