M3-0.5 X 16mm 소켓 캡 나사 | 접시 머리 육각 소켓 드라이브 | 전체 나사산 | 12.9급 합금강 아연 도금 (600 / 팩)

The hex socket drive is really solid, no stripping like with cheaper screws. These 16mm lengths fit perfectly in my tooling fixture, and the zinc plating looks clean and consistent throughout the box.

Bought these for a jig I’m building and the 12.9 alloy steel feels seriously sturdy—no flex at all when torquing them down. The zinc plating is even and smooth, so they thread into blind holes without any binding. For 600 pieces at this price, hard to beat.

For a precision fixture I'm machining, the hex socket drive on these seated perfectly every time, no stripped corners. The zinc plating has a uniform, clean finish that should hold up fine in the shop. A full box of 600 at this class 12.9 strength is a solid deal.