Punching holes with a needle punch can solve the problem that tapping threads on thin iron sheets are not easy to slide.

When punching, the size of the needle bar should be exactly the size of the thread bottom hole, such as the standard coarse thread of M4x0 x0,7; The punching size is 3,24 24mm, and the punching size of M3x0 is 2,46 mm. ..

In this way, after the needle tip pierces the thin plate, the plate skin will bend downward at a 90-degree angle, so that the tapping distance will be lengthened, and it will naturally be difficult to slide the hole with more lines.

I hope it helps you.