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Thread: 2002 R1150R - Steering Head Bolt Size?

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    2002 R1150R - Steering Head Bolt Size?

    Anyone have any idea what the bolt / threading size is on the relatively large steering head bolt on a '02 R1150R? I need to clean both the male and female threads up and need to know what size tap / die I need. The BMW part # is 31 422 314 1 31 but the sizing info is not listed on the fische. Thanks for your help!

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    Pepperfool GSAddict's Avatar
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    I can help you on Sunday when I get back to the shop.
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    PM Sent...thanks!

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    Pepperfool GSAddict's Avatar
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    M18 x 1.5
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  5. #5

    IS there standard or fine threads involved? I am told that there is another number ?

    Quote Originally Posted by GSAddict View Post
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    M18 x 1.5
    Is it fine thread or ?

    Paul ( similarly situated)

  6. #6
    #13338 PGlaves's Avatar
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    Quote Originally Posted by mslacool View Post
    Is it fine thread or ?

    Paul ( similarly situated)
    18mm x 1.5 means a diameter of 18mm and a thread pitch of 1.5. Course or fine thread are word descriptors but a pitch of 1.5 means the distance from one thread to the next is 1.5mm.

    I am not used to looking at 18mm diameter fasteners. I know that at 8mm 1.5 would be course and 1.0 would be fine, but have no real idea at 18mm.
    Paul Glaves - "Big Bend", Texas U.S.A
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    Fortis Fortuna Adiuvat Omega Man's Avatar
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    I find it complicated-

    This example may help-



    What does M8 1.25 mean?
    For metric fasteners, you will see a M8 x 1.25 or an M8 x 1. For thread pitch, the distance between two points is the second number meaning the higher the number the fewer threads there are. This means the M8 x 1.25 is the coarse threading and the M8 x 1 is the fine thread.

    Metrically threadrically challenged OM
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  8. #8
    Gerard jagarra's Avatar
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    When you get to large dies they can get pricy a real handy solution to your issue is a metric thread file. I googled for one Amazon lists one with 1.0, 1.25, 1.5 and 2.0 for about $15.00. These work great for cleaning threads, especially on points where you canít access a die.
    1994 R1100RS-(5/93)-,1974 R90/6 built 9/73,--1987 K75S,--1964 Triumph T100--1986 Honda XL600R

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    Registered User jnrugg's Avatar
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