Fastener tightening of several bolts or nuts on a large part generally follows a:

Fastener tightening, particularly on large parts, typically follows a crisscross pattern to ensure even distribution of pressure. This method helps prevent warping or distortion of the part being assembled. When tightening multiple fasteners, applying torque in this way gradually allows for uniform tension across the assembly, which is crucial in maintaining structural integrity and performance. By working in a crisscross fashion, you are essentially balancing the tension across the surface, allowing for a more secure and stable fit.

In situations where fasteners are tightened in a clockwise or counterclockwise manner, it may not achieve the same level of even load distribution, potentially leading to issues such as uneven wear, stress points, or failure of the assembly over time. Therefore, using a crisscross pattern is a best practice in mechanical assembly, especially for components that experience significant stress or require precise alignment.