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Thread: Pre 1967 JIS fasteners

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    Senior Member Yakeye's Avatar
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    Pre 1967 JIS fasteners

    Can anyone shed some light on JIS fasteners for pre1967 Hondas? Particularly 305 Superhawks, Scramblers and Dreams. I am use to 1970s JIS screws with the small dot on the head of the screw. I read somewhere that the pre 1967 JIS (no dot on the head) have a different thread pitch .....9 compared to 8 pitch on the newer JIS fasteners. Is this correct ?? The reason for my inquiry is I want to replace some of the current damaged screws on a Superhawk. Thanks for any help or pointing me to any reference. Sounds like I'm becoming a fastener nerd !
    "Riding is Freedom"
    71CB350

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    Benevolent Dictator ancientdad's Avatar
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    IIRC the earlier version was ISO threads but someone far more familiar with the older models will have to confirm or refute my old-ass memory.
    (move along, nothing to see here)

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    Senior Member WintrSol's Avatar
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    If you have one out, measure 10 threads. Use a metric scale or a vernier that reads in millimeters. Divide the result into 10 to get the pitch in mm. If it is ISO threads, switch to the ISO (inch) and use the same math.
    ~1970 CB450 (junkyard dog), 1998 Valkyrie, black with lots of chrome

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    Senior Member 12ozPBR's Avatar
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    You may already be aware of this info or perhaps it will be helpful to you or others. This comes from the Superhawk factory parts manual.
    E949E7CC-1F31-44BD-9421-F78E3607EA28.jpg

    0781411F-F558-48AF-B061-714B5569316E.jpg

    3ECD0C7E-9836-468A-8390-292511112AC7.jpg

    1974 CB450
    1974 XL350
    1972 CL350
    1971 Triumph Tiger

    Parts hound with too many other potential projects to mention...
    Bombers, K1 450’s, etc

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    Senior Member ballbearian's Avatar
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    Quote Originally Posted by Yakeye View Post
    Can anyone shed some light on JIS fasteners for pre1967 Hondas? Particularly 305 Superhawks, Scramblers and Dreams. I am use to 1970s JIS screws with the small dot on the head of the screw. I read somewhere that the pre 1967 JIS (no dot on the head) have a different thread pitch .....9 compared to 8 pitch on the newer JIS fasteners. Is this correct ?? The reason for my inquiry is I want to replace some of the current damaged screws on a Superhawk. Thanks for any help or pointing me to any reference. Sounds like I'm becoming a fastener nerd !

    You are correct that the 5mm screw pitch changed from .9 to .8 and there are no dimples on the earlier ones. The 6mm bolts /screws didn't change. The countersunk cross head screws on the points cover and stator covers are the hard ones to find, the originals have a slight dome and are chromed. I try to save these by gently peening them smooth and hold them in soft jaw vise while pounding in a JIS #2 tip and them finally buffing on a wheel. Belmetric Fasters have a very limited selection of these courser thread screws but without the chrome and the heads are totally flat. The points plates are also like this and you will find the 4mm ones there (usually slotted) as well as the 3mm tailight lense screws.

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    Senior Member Flyin900's Avatar
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    Quote Originally Posted by ballbearian View Post
    You are correct that the 5mm screw pitch changed from .9 to .8 and there are no dimples on the earlier ones. The 6mm bolts /screws didn't change. The countersunk cross head screws on the points cover and stator covers are the hard ones to find, the originals have a slight dome and are chromed. I try to save these by gently peening them smooth and hold them in soft jaw vise while pounding in a JIS #2 tip and them finally buffing on a wheel. Belmetric Fasters have a very limited selection of these courser thread screws but without the chrome and the heads are totally flat. The points plates are also like this and you will find the 4mm ones there (usually slotted) as well as the 3mm tailight lense screws.
    The one I found difficult was the tiny screw on the chrome cover over the steering lock on the 1966 CL77. I ordered two different thread pitch screws from CMSNL and neither fit the cast mounting in the lower triple tree. I ended up using the original screw after a clean up, since it was correct. When the pitch gets to .5 or .6 .7 or .8 TP it is hard too see with these old eyes, if the metric gauge fits or not.
    1966 CL77 - 305cc - Gentleman's Scrambler
    1967 CL175K0 - Scrambler #802 engine
    1972 CB350F - Candy Bacchus Olive - Super Sport
    1973 CB350F - Flake Matador Red - Super Sport
    1975 CB400F - Parakeet Yellow - Super Sport
    1976 GL1000 - Goldwing Standard
    1978 CB550K - Super Sport

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    Senior Member ballbearian's Avatar
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    Quote Originally Posted by Flyin900 View Post
    The one I found difficult was the tiny screw on the chrome cover over the steering lock on the 1966 CL77. I ordered two different thread pitch screws from CMSNL and neither fit the cast mounting in the lower triple tree. I ended up using the original screw after a clean up, since it was correct. When the pitch gets to .5 or .6 .7 or .8 TP it is hard too see with these old eyes, if the metric gauge fits or not.
    I didn't think of those little 3mm. They might be the same as the emblem screws on the tank covers.

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    Senior Member Yakeye's Avatar
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    Thanks everyone for the info and help. Much appreciated.
    "Riding is Freedom"
    71CB350

  9. #9
    Senior Member Yakeye's Avatar
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    Quote Originally Posted by 12ozPBR View Post
    You may already be aware of this info or perhaps it will be helpful to you or others. This comes from the Superhawk factory parts manual.
    E949E7CC-1F31-44BD-9421-F78E3607EA28.jpg

    0781411F-F558-48AF-B061-714B5569316E.jpg

    3ECD0C7E-9836-468A-8390-292511112AC7.jpg
    Chris I have scanned the CB77 manual but totally missed this info. I was not aware of this excellent chart and description. Thank you for providing this. Does this affect your 450 Black Bomber bikes since they were produced in 1965-1969?
    "Riding is Freedom"
    71CB350

  10. #10
    Senior Member Yakeye's Avatar
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    Quote Originally Posted by ballbearian View Post
    You are correct that the 5mm screw pitch changed from .9 to .8 and there are no dimples on the earlier ones. The 6mm bolts /screws didn't change. The countersunk cross head screws on the points cover and stator covers are the hard ones to find, the originals have a slight dome and are chromed. I try to save these by gently peening them smooth and hold them in soft jaw vise while pounding in a JIS #2 tip and them finally buffing on a wheel. Belmetric Fasters have a very limited selection of these courser thread screws but without the chrome and the heads are totally flat. The points plates are also like this and you will find the 4mm ones there (usually slotted) as well as the 3mm tailight lense screws.
    Thank you for the Belmetric link. I will check it out. Maybe the only place to find the 9 pitch screws if originals are impossible to find or cost prohibitive.!
    "Riding is Freedom"
    71CB350

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