5/8-18 X 2-1/4" 杯點內六角止付螺絲 | 合金鋼 (25個/包)

For a heavy-duty indexing fixture I’m building, the hex socket drive made tightening these set screws in tight spots a breeze—even with oil on my hands. The cup point tip really digs in and holds firm, which gives me confidence the assembly won’t shift under load.

Installed these on a custom jig where I needed to adjust clamping pressure in a tight spot, and the cup point design really helps the screw seat flush. Alloy steel feels solid, no stripping after a dozen adjustments.

The hex socket drive grabbed perfectly even in a cramped spot where a regular wrench wouldn't have fit. Alloy steel feels solid and the cup point bit into the shaft without slipping once. These are exactly what I needed for a stubborn gear setup.