1. If the air pressure is not enough, the striker will not come back. First, check whether the air pressure at the air inlet joint of the nail gun is between 5 and 5-6.5 kgf/cm2.

2. The firing pin will be bent or damaged after being used for a long time and needs to be replaced.

3. The nail pusher is deformed or damaged and needs to be replaced.

4. There is no tension in the nail pushing spring. Replace the nail pushing spring. All of the above may cause the nail gun to fail to nail. If you want to repair and test yourself, you need to cut off the air supply. The nails used in the steel nail gun are called pneumatic steel nails. Pneumatic steel nail row is made of carbon steel, which is made of 45 # steel or 55 # steel. After drawing, annealing, nail making and quenching, the texture is relatively hard. As for strength and hardness, steel row nails are basically 45 medium carbon steel. Basically similar to cement steel nails and round cement loose nails. The more demanding steel row nails will use 55 medium and high carbon steel, which has higher strength and hardness.