Cap Screw, M4x40, Socket Head

The 40 mm length gave me just enough reach for the bracket I was mounting, and the hex socket drive seated perfectly on my Allen key without any wobble. Threads were clean and consistent from the first turn.

The M4 threading cut smoothly into the pre-tapped hole with zero resistance. I used three of these to secure a mounting bracket, and the socket head gave my allen wrench a perfect, non-slip grip. Solid holding power for a small fastener.

The 40mm length was exactly what I needed to secure a bracket through a thick spacer, and the M4 threads threaded smoothly into the pre-tapped hole without any binding. Feels solid and well-machined, no burs or rough edges.