M12 X 12mm 滾花杯端內六角止付螺絲 | 合金鋼 (250 個/包)

The hex socket drive made tightening these in a tight spot on my machine frame way easier than I expected. All 250 screws came in the pack and the alloy steel feels solid, no stripped threads so far.

The knurled cup point really bites into the shaft without slipping, which made tightening these in a cramped gearbox a breeze. All 250 pieces arrived clean and uniform, and the hex socket drive let me get good torque even at an awkward angle.

I needed a high-torque fastener for a cramped gearbox adjustment port, and these set screws fit the bill with their hex socket drive. The alloy steel feels sturdy enough to handle repeated tightening without stripping. A solid choice for industrial applications.