M4 X 35mm 杯端內六角止付螺絲 | 合金鋼 (250顆/包)

Installed an entire 3D printer bed leveling set with these and not a single stripped head. The hex socket drive grabs the driver perfectly even in the tightest corners.

The cup point bit into the shaft firmly when I torqued it down, and the M4 fit perfectly in the blind hole I was working on. I’ve used a lot of set screws that strip, but the alloy steel held up without any issues across all 250.

The hex socket drive made installing these in a tight pulley assembly way easier than I anticipated, no stripping even at high torque. Cup point bites into the shaft firmly, and all 250 pieces came threaded cleanly with no burrs to clean up before use.