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Its a characteristic of the metal itself more than physical properties (hardness, toughness, yield, etc). Some stainless alloys will be better than others. SS are generally stainless because the oxide outer layer is protective and sticks to the surface. If it gets knocked off by scraping or high pressure on make up, the metal can self weld.
Never had a huge problem with it on fasteners personally. At least those bolts are easy to cut off if needed. I think plain steel would work just as well there though.
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84 930
18 Cayman GTS
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