M2 Screw - What Hex wrench size?

Charles LensCharles Lens Club Members Posts: 1
edited July 2018 in Tools, Bags and Storage

Hi guys - I fly an Emax Babyhawk R with 1106 motors on it and I stripped some of the screws that mount the motor to the frame. They need a 1.5mm hex wrench. I have been searching high and low for replacements, and what I thought I found to be correct was an M2x5mm screw which I ordered from Hobbyking (see link below), but I have just received these and find that the 1.5mm hex wrench is too big (i.e. the hole in the screw for the wrench is <1.5mm) for them. I don't have a 1mm hex wrench so I can't test that, but I can't seem to find anywhere online what the relationship is between M1, M2, M3, etc screws (with the number indicating the diameter of the screw in mm) and the size of the hex key required.

I have seen other websites indicating that the standard size for an M2 should be 1.56mm, but it is obviously less than this on the screws I have just received. (https://www.engineersedge.com/iso_socket_head_screw.htm)

Please can someone help me with this?? Thanks so much



  • WTWUKWTWUK CornwallClub Members Posts: 13,613 ✭✭✭

    From memory these need a 1or 1.25mm allen key. I have button head screws that take those sizes, but not sure which ones were the HK sourced ones.

  • Aviatoy_ruAviatoy_ru Club Members Posts: 10

    Мы обычно берем напильник и подпиливаем шестигранник под нужный размер.

  • RBTRBT Club Members Posts: 9

    1.5 or 2.0 depending on what type head the screw is, button or cap.

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