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Thread: Source needed for Allen head carburetor top retaining screw

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  1. #1
    Join Date
    Aug 2010
    Scottsdale, AZ

    Source needed for Allen head carburetor top retaining screw

    I installed these stainless, Allen head carb top retaining screws on my R90/6 decades ago, and forget where I bought them.

    I need to replace one, and do not want to revert to the stock Philips head ones.

    Does anyone have a source for these, please? It's circled in red:

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    San Antonio, TX
    Bing seems to have them...but looks like they sell kits w/ 8 screws for both carbs:

    Call them and see if they have any ideas for one or two.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Join Date
    Aug 2010
    Scottsdale, AZ
    Thank you, Kurt. That is greatly appreciated.

    I contacted Bing and they do sell individual screws #40-573 @ $4.61 each.

    At that price I'm glad I'm not building the Space Shuttle, but it beats wasting money on four or eight.

  4. #4
    Registered User kioolt's Avatar
    Join Date
    Apr 2003
    I look at McMaster Carr ( for a lot of stuff. When you go to the web page don't just look at the picture for the main category. Look at the name of the main category. You can drill down from there to find a lot of variations in the category. I don't know what size screw it is but for instance McMaster has M3 by 10 for $5.91 for 100.
    2004 R1150RT 186,800 miles , 1991 K100LT 128,700 miles, 1982 R100RT 106,900 miles
    Total 422,400 BMW miles
    The cheapest thing on a BMW is the nut that connects the handlebars to the seat.

  5. #5
    Registered User
    Join Date
    Jun 2018
    go to Look under Allen Head Fasteners. They have countersunk flat head in stainless in many sizes for less than 20c each.
    The head is flat instead of domed. Remember when you measure these type of screws the nominal size is the total length.

  6. #6
    Registered User
    Join Date
    Apr 2013
    Southern California USA
    What about your favorite hardware store? My local Ace hardware has a great selection of metric fasteners, in different head configurations, oval, flat, allen type, philips, button head, etc. Just my 2.

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