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  1. #1
    Senior Member bamacrazy's Avatar
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    Sorry for the Lame Question, but....

    Exactly what are the screw in grommets on bike frames called? I'm referring to the screws that mount water bottle cages and luggage racks. Also, can you order these in stainless?

  2. #2
    Senior Member curbtender's Avatar
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    I'd call them mounting bolts.

  3. #3
    Senior member Dan Burkhart's Avatar
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    Quote Originally Posted by bamacrazy View Post
    Exactly what are the screw in grommets on bike frames called? I'm referring to the screws that mount water bottle cages and luggage racks. Also, can you order these in stainless?
    The generic name is tubular threaded rivet. A couple of brand names are riv-nuts and nut-serts. They don't screw in, but rather are inserted and then compressed from behind like a blind rivet.
    Riv-nuts are avilable in stainless or aluminum.

  4. #4
    AEO
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    Senior Member AEO's Avatar
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    grommets are pieces that either reinforce a hole or protect something from sharp edges, kind of like a washer, but one piece will usually cover both sides.

    the big difference is that they're never threaded. so calling the riv-nuts and brazeons 'grommets' is a misnomer.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
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  5. #5
    Your mom
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    It depends on whether your frame is aluminum or steel. In an aluminum frame, the nuts are riveted in, in a steel frame, they're brazed-on.

  6. #6
    A little North of Hell
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    Quote Originally Posted by tellyho View Post
    in a steel frame, they're brazed-on.
    not always.
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  7. #7
    Bikaholic blamp28's Avatar
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    For the OP:

    Since we are trying to help here.

    If you are referring to the threaded mounting points in your frame, they are called braze -ons by many as others have stated. If you are referring to the threaded fastener used to attach cages, racks etc. They are usually aluminum Socket Head Cap Screws or Button Head Cap Screws and are available also on stainless at any local bike shop or your local hardware store for less than a dollar.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  8. #8
    Senior Member bamacrazy's Avatar
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    Thanks for the help. I am talking about the threaded screws. This is for a steel frame Bianchi circa 1988. The caps have started to rust and I was hoping to replace them with stainless.

  9. #9
    headtube. zzyzx_xyzzy's Avatar
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    The actual screws are called screws

    They're socket-head or button head cap screws, almost always 5x0.8mm threading, about 15mm length. Try your nearest fastener store.

  10. #10
    Senior Member bamacrazy's Avatar
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    The ones I needed were M5 Socket head screws. After 3 stops I was able to find them in stainless for 37 cents each. Thanks for all the help!

  11. #11
    Bikaholic blamp28's Avatar
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    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

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