براغي آلية مسننة مقاس 5/16-18 × 5/8 بوصة | رأس سداسي مسنن بدون محرك | فولاذ مطلي بالزنك (100/عبوة)

These serrated hex heads lock into metal enclosures without stripping — perfect for mounting control panels. The zinc plating on mine looks clean and uniform, no burrs right out of the bag.

These little 5/16-18 screws are solid for the price, the zinc plating gives them a clean, uniform finish that matches up nicely. I grabbed a pack for attaching some metal brackets and the indented hex head held a wrench perfectly without slipping, which is exactly what I needed.

The unslotted drive took me a second to get used to with my impact driver, but once I swapped in the right bit, they seated perfectly into the enclosure panel. The zinc finish is holding up fine so far, no rust after a couple weeks in a mildly damp garage.