M8-1 x 40mm 소켓 머리 볼트 | 육각 소켓 드라이브 | 부분 나사 | 12.9급 합금강 아연 도금 (100개/팩)

The threads cut cleanly into my steel fixture plate with no binding, and the zinc plating looks uniform across all 100 pieces. I needed strong, precise fasteners for a jig rebuild, and these 12.9 grade screws delivered the torque without any worry.

The hex socket drive seated perfectly on my Allen key, and every one of the 100 screws in the bag had a smooth, even zinc plating. They’ve held up great in my jig fixtures, and the 12.9 alloy steel feels plenty sturdy for the torque I’m putting on them.

Threads are clean and the zinc coating looks uniform across all 100 pieces, no rust spots or burrs right out of the bag. I used them for a jig build and the partial threading gave just the right grip depth without bottoming out.