You will find here the washers most used for Japanese motorcycles. There are three types:

  • The flat washer with standard head that may be found in most shops anywhere.
  • The flat washer with a smaller head to accommodate small head bolts.
  • The spring washer used with a flat washer to lock a bolt in place.

 

Naturally Japanese bikes use JIS washers, not the ISO sizes sold at your local hardware store!

JIS Washers

Size
Type
Material
  • Size

    JIS

    JIS Small     

    Spring

    M3

    3.3x8x0.5

    3.3x6x0.5

    3.1x5.9x0.7

    M4

    4.5x10x0.8

    4.5x8x0.5

    4.1x7.6x1.0

    M5

    5.5x12x0.8

    5.5x10x0.8

    5.1x9.2x1.3

    M6

    6.5x13x1.0

    6.5x11.5x0.8

    6.1x12.2x1.5

    M8

    8.5x18x1.6

    8.5x16x1.0

    8.2x15.4x2

    M10

    10.5x22x1.6

    10.5x18x1.6

    10.2x18.4x2.5

    M12

    12.5x26x2.3

    12.5x22x2.3

    12.2x21.5x3

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