M5 x 16mm 杯頭內六角止付螺絲 | 316不鏽鋼 (250個/包)

The cup point on these set screws bites nicely into the shaft, and the 316 stainless feels solid enough to trust in a marine environment. My only minor gripe is the hex socket is a bit shallow, but it seats the driver well for tight adjustments.

These are exactly what I needed for the outdoor furniture project, and the 316 stainless steel gives me real confidence against the salt air. The cup point sits flush without any filing, which saved me a ton of time.

The hex socket drive made seating these in a tight gearbox housing a breeze, even with limited finger room. The 316 stainless finish feels substantial, not flimsy like some cheaper sets I've used.