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    Legacy Member kar66's Avatar
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    Question Japanese 7.7 thread size?

    I bought a sporterized Japaneseicon 7.7 rifle. It only had one screw left with the receiver. I suspected it was stuck. It took a while to get out and when I did I found the threads were stripped. My question is what size are the threads. They look like 1/4 by 28. But they aren't.I guess they must be metric. Anyone know size they are?
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    They may be 1/4" screws after all. Mausers have 'em as well. But IIRC, the Type 38 and Type 99 MAY have different thread pitches. But I've no way to check for several days.

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    Legacy Member kar66's Avatar
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    Thread Starter

    Size?

    Yes k98s use a 1/4 20nc thread. I may end up tapping it out to that. But I would like to keep it orig. if I can. I tryed screwing in another orig. screw and just messed it up a little on the end it wouldn't start. I got a 1/4 28 dye the screw would start but only go about 1/2 turn and stop. Thats why I wounder if something metric would work? I have some new made screws from Midway if I could get the orig. threads cleaned up. Thanks for the help.

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    1/4x32? I think there may be an old thread that discusses this very subject, maybe a year or two old. Too busy cooking to spend much time on the site today. And the next several days are likely to be worse. But the 1/4" OD is not metric, so it's "gunsmith size". Or "super sercret military magic size". Firearms seem to have required bizarro threads for the longest time.

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    Screws

    You can buy new screws mfg. buy Forster. I guess they work I don't remember using any. But I bought three sets for spares. But they don't say anything on the package except For Japaneseicon 7.7 actions.

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    Japanese Arisakaicon screws are a one of a kind, however,,,if you plan on retapping the the threads, careful,,you can blow those holes out pretty easy.
    if the screws stripped out inside the hole, you can pick the threads and save them...iv seen this done many times, guys trying to fix a buggered hole, and blow the hole out,
    iv yet to see one done succesful.
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    6mm x 0.9

    I do not have a T99. But I do have a T38. The trigger-guard screw thread size on this rifle is 6mm dia. x 0.9mm pitch.
    28 tpi is 0.907 mm pitch. So a 28 tpi chaser will do, if you can get a suitable 6mm bolt with a long unthreaded portion and turn the 28 tpi on that.


    Patrick

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    Legacy Member vintage hunter's Avatar
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    Not quite Patrick. T99 screws are'nt the same as those for the T38, without getting to technical they're larger in diameter and have a finer thread than T38 screws. Closer to the 1/4x32 Jmoore suggested.

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    Quote Originally Posted by vintage hunter View Post
    Not quite Patrick. T99 screws are'nt the same as those for the T38, without getting to technical they're larger in diameter and have a finer thread than T38 screws. Closer to the 1/4x32 Jmoore suggested.

    Thanks for that info. They are probably going to be metric, nevertheless. If someone could provide measurements of an example, maybe one could suggest a near equivalent!


    Patrick

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    In a bit of a hurry ATM, but a few quick measurements show that T99 screws do indeed have a major diameter of .234'' or 6mm. Threads are 34 TPI on a standard gage. Have'nt found a match to any known metric gage yet. Have to check later but by butting the 99 screw end to end with a 38 screw it looks like the 38 screw has tapered threads. Maybe just my eyes playing tricks........................

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