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  1. #1
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    source for 410/4xx alloy stainless bolts (aka magnetic stainless steel)

    Hi -

    I need a number of magnetic bolts for bike related projects. Obviously everything is subjected to the elements.

    I've searched everywhere i know of (including mcmaster.com and Tacoma Screw) for a 400-series alloy stainless steel metric socket cap screw. Unlike the 300 series bolts these should have strong magnatism as well as (decent; worse than 300's) corrosion resistance. Corrosion resistance should be much better than zinc'd steel, though.

    Do you have any ideas where I could find this? Obviously this is typically an industrial product and on 'industrial' scale I'm very low volume.

    Thanks!

  2. #2
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    McMaster Carr has them. They call it Nickel Alloy

  3. #3
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    Quote Originally Posted by Kolchak View Post
    McMaster Carr has them. They call it Nickel Alloy
    Huh. I'll try them again. I emailed them asking for any 400 alloy; it would be odd if their customer service didn't know what that was.

  4. #4
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    Quote Originally Posted by Kolchak View Post
    McMaster Carr has them. They call it Nickel Alloy
    Quote Originally Posted by high_desert_mud View Post
    Huh. I'll try them again. I emailed them asking for any 400 alloy; it would be odd if their customer service didn't know what that was.
    Ok, i found their product page. https://www.mcmaster.com/#96146a157/=19egkek ("nickel alloy socket head screw") clicking through one size, it says "400 Nickel", and "mildly magnetic"

    I'm a little confused; my understanding was it is nickel, primarily, which changes the room-temp stable crystal structure of the alloy to one which is not magnetic; and 400 series alloys differ from 300 series by the zero or lower nickel. Also I was under the impression that had generally less corrosion resistance than 300, not more as the Mcmaster listing states.

  5. #5
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    look here
    https://www.mcmaster.com/#standard-s...crews/=19egqzi

    The Nickel alloy are actually monel which is slightly magnetic not 400ss sorry.

  6. #6
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  7. #7
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    Quote Originally Posted by Kolchak View Post
    look here
    https://www.mcmaster.com/#standard-s...crews/=19egqzi

    The Nickel alloy are actually monel which is slightly magnetic not 400ss sorry.
    We use Monel all the time here at work. Great corrosion resistance (particularly to salt water), pretty high tensile strength, but generally soft and fairly prone to gauling. Not my idea of an ideal fastener material.

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