Let’s see how Lego-compatible stainless steel axle deforms or breaks when high torque is applied.
The test bench is made using only plastic Lego parts. Enjoy!

The axle was bought from Brick Machine Shop on BrickLink (obsolete) https://store.bricklink.com/Eezo?itemID=106643711
it was later sold by cncgear on EBay (obsolete) https://www.ebay.com/itm/19-units-long-stainless-steel-axle-X-style-works-with-Lego-Technic-gears/262583950400
as of Jan 2026, steel axles are available from MTP https://metal-technic-parts.com/products/stainless-steel-metal-axle-compatible-with-lego-technic

Music:
Winter Embrace by Silent Partner
YouTube Audio Library