M20-1.5 x 50mm 육각 머리 캡 나사 | 10.9급 강철 아연 도금 | 풀 나사산 (25개/팩)

The hex head took a socket perfectly without slipping—no rounding off the corners. Threads are clean and continuous, which made assembly a breeze. These will hold up in heavy machinery, just what I needed.

Used these to secure a conveyor belt support frame, and the class 10.9 steel held torque beautifully without stripping. The zinc plating seems durable enough for my shop environment, and the fully threaded design made alignment much easier.

Put these on a press brake rebuild yesterday and the 10.9 steel held torque perfectly without any deformation. The hex head fit my socket wrench snugly, which made assembly in tight spaces much easier. Exactly what I needed for industrial fastening.