I’ve seen a number of different sources claiming that you should use a stainless steel screwdriver or bit insert to drive stainless steel screws, but Wera does the best job of explaining why:
Stainless steel does not rust. However, if conventional steel tools are used on stainless steel elements or stainless steel screws the wear debris of these tools can adhere to the surface an begin to rust. This effect, known as extraneous rust, can impair the visual impact and even cause structural damage, resulting in high costs for the necessary repair work.
This sounds all well and good, but stainless steel screwdrivers aren’t as hard as screwdrivers made from other materials, so Wera solves this with their new vacuum ice hardening process. If I understand the process correctly, they allow the steel to cool in a cryogenic vacuum chamber.
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