M16 X 35mm 杯端內六角止付螺絲 | 合金鋼 (50/包)

The cup point bites into the shaft firmly, so I don't have to worry about it backing out under vibration. Alloy steel feels tough, and the hex socket took the torque without stripping.

Installed these in a tight motor housing where a hex wrench wouldn’t fit, and the hex socket drive made high-torque adjustment easy. The alloy steel feels solid, and the cup point stayed put without slipping. Exactly what I needed for this tricky assembly.

The hex drive grabbed the bit nicely and let me torque these down in a cramped space without stripping. They held firm during the initial test fit, though I wish the package included a few extras. Very solid screws for the price.