How to install and use nuts correctly?

Preparation before installation:
1. Choose the right nut: Choose the matching nut according to the specifications (diameter, pitch, length, etc.), material, working environment and tightening requirements of the bolt or screw.
2. Check the thread: Make sure that the threads of the nut and bolt are free of damage, deformation and debris, and the threads should be clean and smooth.
3. Prepare tools: Prepare the right wrench, socket or screwdriver and other tools according to the type and size of the nut.
Installation process:
1. Align the threads: Gently screw the nut onto the bolt or screw to ensure that the threads are aligned and avoid forced screwing to cause thread damage.
2. Tighten evenly: Use the tool to gradually tighten the nut, using a cross-symmetrical tightening sequence to ensure that the tightening force is evenly distributed. For connections with multiple nuts, tighten them one by one gradually.
3. Control the tightening force: Avoid over-tightening or under-tightening. Refer to relevant standards or technical requirements to determine the appropriate tightening torque. For critical connection parts, if conditions permit, a torque wrench can be used to accurately control the torque.
4. Check the tightening effect: After tightening, check whether the connected parts are firm and there is no looseness or gap.