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  1. Zonker

    316 SS machine screws - Passivated or not

    The black crawls up your arm faster!
  2. Zonker

    316 SS machine screws - Passivated or not

    Yeah, I like polysulphide for longevity. I think it actually has a longer life than most polyurethanes like Sika 291 / 5200 etc. Polysulphide is very "stringy" so it pulls away in long strands as you use it; the trick is keep the caulking gun on the work; release the trigger and pause, then...
  3. Zonker

    316 SS machine screws - Passivated or not

    I've seen the odd Robertson head s.s. machine screws but they are extremely rare. I'd go with the hex head too. I doubt the originals were "passivated". (Machining s.s. to form threads can make the surface more active. If you're really worried you can...
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