The handset has undergone a comprehensive teardown over at MyFixGuide. The entire thing (complete with dozens of images) can be found at the Source linked below, but here’s the gist of it.
The OnePlus 5 was found to feature a solid build overall, but it apparently does have some weak spots. While its “strict sealing design” and the “thickening process” employed on the back corners are reminiscent of tactics applied by such companies as Apple, Samsung, Oppo, and vivo, some connectors inside the OnePlus 5 aren’t fixed with metal plates which means they could get loose. This is especially true for the camera connector.
Hopefully you won’t be in a situation where that fails. The “systematically sealing design” of the OnePlus 5 hides a Li-polymer battery made by ATL, a 16 MP Sony IMX371 f/2.0 front camera, and a dual rear setup made up of a 16 MP f/1.7 Sony IMX398 and a 20 MP f/2.6 Sony IMX350.