Not all "Phillips" screws are the same: JIS

Discussion in 'The Garage' started by Granitic, Nov 8, 2015.

  1. Granitic

    Granitic Backcountry rider

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    #1
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  2. adaycj

    adaycj Been here awhile

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    I owned a set of JIS screwdrivers at one point. My observation is that they were very close to the same, and if you used a new Phillips it was even closer. I personally think that most damage comes from improper use of the tool, use of a worn out tool, excessive tightening of the fasteners, and excessive reuse of the fasteners. When working on old stuff the damage from all of those problems typically occurred from someone else. And that is the problem. My JIS drivers if anything seemed worse at taking out worn JIS screws than a new Phillips or an hand operated impact driver when appropriate when there was already damage. There effectiveness was also not as good on the larger fasteners on side cases and covers where the fasteners were specialized enough to be difficult to replace. Even more strange, as the fasteners got bigger many seemed closer to the Phillips style when you looked at the fastener, and less like the JIS perfect X.

    With all that said there is nothing wrong with dropping $20 or $30 on a set and trying to use them where appropriate. If a person didn't already own a hand held impact driver, I'd spend the money there first. They are very good at stamping JIS screw heads into a Phillips shape while loosening the fastener :lol3
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  3. Grinnin

    Grinnin Forever N00b

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    It's probably better to just call it JIS. It's not a JIS Phillips.

    JIS has the dot on the screw head.
    #3
  4. Yinzer Moto

    Yinzer Moto aka: trailer Rails

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    It is not just Japanese bikes, it is pretty much all bikes.
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  5. CA_Strom

    CA_Strom Cunning Linguist

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    Try working on a vintage 1960's Honda without a set of good JIS screwdrivers..... After rebuilding two 1965's, my Vessel JIS drivers save a lot of headaches!
    #5
  6. Hoodcounty

    Hoodcounty Been here awhile

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    Aren't the Japanese screws phirrips??
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  7. joexr

    joexr Banned

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    Sclews . :deal :lol3
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  8. flinders_72

    flinders_72 Long timer

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    That. Screwdrivers are cheap.
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  9. Grreatdog

    Grreatdog Long timer

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    What I do is simply not give a damn if they strip because they will be replaced with allen or hex head anyway. If I even think a case screw is going to strip I just drill the head off and replace it with a real bolt.

    My wonderful 35 year old Craftsman hand impact wrench hasn't left the tool box since I had this revelation about the absolute insanity of using any type of JIS or phillips screw for anything engine related.
    #9
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  10. Skowinski

    Skowinski opposable thumbs

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    Yep, exactly. I'm helping Skowinski-wife rebuild a 71 Honda CB500, and it's amazing how many of these JIS screws are buggered already, and had to destroy others to get them off. They all go in the trash can and get replaced by with either standard hex head or allen head screws.
    #10
  11. CA_Strom

    CA_Strom Cunning Linguist

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    Totally agree with the comments on replacing the JIS soft screws with stainless hex heads. I've done 3 CT90 motors, and all got full replacements and it really makes future service much easier. Now with the tiny JIS screws on a 60's carb, the proper drivers will save you a fair amount of grief....
    #11
  12. Hennepinboy

    Hennepinboy Have battery will travel.

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    Anyone know know of a vendor that sell JIS insert bits? I have searched the Web without any luck finding bit. I prefer using bits type disposable inserts over plain screwdrivers.
    #12
  13. CA_Strom

    CA_Strom Cunning Linguist

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  14. morgantm

    morgantm Been here awhile

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    I ordered 10 packs of 0-3 JIS from Vessel and still have multiple left of each size, if you want some shoot me a PM and we can work something out.
    #14
  15. MtnRider2

    MtnRider2 Been here awhile

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