براغي تثبيت برأس كوبية مدببة M4 × 8 مم | فولاذ سبائكي مطلي بالزنك (1000 / عبوة)

Bought these for a precision jig and the hex socket drive grabs perfectly with my Allen key. The cup point bites into the shaft without slipping, and the zinc coating looks solid for the price.

Finally found a cup point set screw that actually bites into the shaft without stripping. The hex socket drive makes them easy to install in tight spots, and the zinc plating on this batch looks clean and uniform. Exactly what I needed for securing pulleys on a small custom gearbox.

Used these for mounting a motor bracket and the cup point really digs in, no slipping at all. The hex socket drive made it easy to tighten in a cramped spot. Exactly what I needed for the price.