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Thread: Japanese 7.7 thread size?

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  1. #11
    Advisory Panel Patrick Chadwick's Avatar
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    6mm x 0.75 metric fine pitch

    Sounds like 6mm, with 0,75 mm pitch (= 33.87 tpi). This is a metric fine pitch series, used by model engineers among others, and available in the UKicon, replacing the old 32 tpi series. A specialist tool supplier (not your local DIY store) could get you a die for it. But if you're only going to use it once in a lifetime, just buy a couple of those screws - that will probably be cheaper.


    Patrick

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  4. #12
    Senior Member kar66's Avatar
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    The screws are not the problem. I've got screws and can buy more if needed. It is the treads in the front of the receiver. This is a bubba salvage if it wasn't one of the uncommon mfg., I wouldn't mess with it. Chuck it think your idea is what I need to try first. It looks to me like bubba got his screw started crooked and then just drove it in with a BFH. When I got the screw out a least the first 1/3 of the threads were gone. It was just smooth on the end. Chuck what do you use for a pick? A dental pick. Thanks to the rest of you guys for your help and ideas. I'm about ready to try anything that sounds like it would work. Thanks again

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    Advisory Panel chuckindenver's Avatar
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    if the first part of the hole is trashed, heres what i have and would do..counter sink it, over size the hole down to the good threads, and then you can use a longer then needed screw if you have to, if the buggered the hole, then trying to fix it will be tough..if its the rear screw on the action, you may be able to come in from the top side and run a tap from the good threads down to the buggered threads..
    if the old screw left meat inside the hole, then a good dental pic or sharp punch, and take your time, picking threads is a labor of love,,,hate rather...
    if its the front guard screw...counter drill it, and be done.
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    Senior Member kar66's Avatar
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    Thanks

    Thanks, it's the front screw. I'm going to try picking it first. Then go from there. I'll get back to you with how things work out. I don't have a heated shop to work in and it cold here in central flyover now. So I will probably not work much on that until spring. Right now I'm just getting tools and parts ready to go. Thanks again, Bill

  8. #15
    Senior Member kar66's Avatar
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    Chuck today we are going to counter bore like you said. A guy on another forum said to cut three grooves in a extra screw and use that as a tap. We tryed that last night. It almosted worked. The grooves let us get the screw started and screw all the way in. But when we unscrewed it the threads were a little distorted. I think the lug is skin hardened and that left a burr on the first thread that was harder than the screw. Today we are going to counter bore enought to get rid of the burr. I'm sure that will fix it. Thanks for the idea.

  9. #16
    Advisory Panel chuckindenver's Avatar
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    hope it works out...check your level 2 times, and drill it once..if it doesnt look right,..dont drill it.

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