Buying from an OEM certainly doesn’t come with any guarantees. It’s a price/quality contract in almost all cases though. The OEM defines an acceptable defectivi

Buying from an OEM certainly doesn’t come with any guarantees. It’s a price/quality contract in almost all cases though. The OEM defines an acceptable defectivity rate in their contract (even if allowed DPM if high). This effectively establishes a requirement at the supplier to ensure they will meet it. For consumer products, you can assume that this added requirement doesn’t exist. Edit: as another example, it’s well known among hardware suppliers that being a supplier to Apple can be a double edged sword for this reason. They have very high quality expectations and they squeeze extremely hard on price. But for that, they bring high volumes. If your company doesn’t have their stuff together, they can easily get raked over the coals in Apple contracts.