PEEK is a very strong and durable polymer, with a high strength-to-weight ratio. It is often used as a replacement for metal components in high-performance engineering applications due to its superior properties.
However, the strength of a screw depends on several factors such as the specific type of metal and the design of the screw. In general, metal screws can be made with a variety of alloys, and the strength will vary depending on the specific alloy used. Whereas PEEK screws are made of the same polymer, so the strength will be consistent.
So, it's hard to make a direct comparison between PEEK screws and metal screws in terms of strength. However, PEEK screws can be designed to have comparable strength to metal screws, and in some cases, PEEK screws may be stronger than metal screws.