M4 X 4mm 平頭內六角止付螺絲 | 18/8 不鏽鋼 (1000 / 包)

I grabbed these for a tight mounting bracket where a standard hex key would have been impossible, and the flat point seated flush without any wobble. The 18/8 stainless feels solid and corrosion-resistant, which is exactly what I needed for outdoor gear.

Finally, a set screw that doesn't strip when I snug it down — that hex socket drive really holds its own in tight spots. The 18/8 stainless seems polished, so no rust worries on this batch. Exactly what my jig needed for high-torque adjustments.

Used a dozen of these to dial in some aluminum brackets where clearance was tight, and the hex socket made it easy to drive them flush without stripping. The 18/8 stainless gives me confidence they won't rust in the garage humidity.