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Old 02-07-2013, 12:07 AM   #1 (permalink)
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unisizer thread

Can anyone tell me what the thread size is for the unisizer
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Old 02-07-2013, 12:17 AM   #2 (permalink)
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The only info I have is

.760-56THD

But I dont know what that means
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Old 02-07-2013, 10:10 AM   #3 (permalink)
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The .760 is the diameter of the thread and 56 is the number of threads per inch. Using that number any skilled machinist should be able to turn you a matching thread. Be aware that the are very fine threads and it will not be cheap. My vendor used to call the sizers "Little bastards" when I called to order them.
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Old 02-07-2013, 10:20 AM   #4 (permalink)
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56 is an incredible number of threads for a large diameter. That's usually a number for tiny screws.

If that is indeed the right number, I would appreciate a pic of such a thing for my own edgumacation.
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Old 02-07-2013, 11:35 AM   #5 (permalink)
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i have a lapco barrel i am trying to have threaded to use the unisizers. im talking with a machinist and he knew what the numbers meant but didnt tell me. he wasnt sure he had the right tool for the small threads.

anyone here know someone that could do this and what it might cost?

sorry the pics are so bad. not sure how to re-size them







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Old 02-07-2013, 04:15 PM   #6 (permalink)
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Important note, you will need to have .740" removed from the Lapco barrel in order to have the major threads work.

I have a very simple solution to this problem that my lazy/skill-lacking brain came up with years ago. Turn the end of the barrel down to .743 for at least .135. This allows you to press the uni-sizer into place and the barrel keeps it there by pressing it against the sleeve assembly.l
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Old 02-07-2013, 04:43 PM   #7 (permalink)
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Forgive me I dont know the terms, but do you mean boring the barrel so the unisizer fits inside?

Would the threads for the unisizer affect the ball?

Would getting the barrel freak bored be better? What advantage would the unisizer have?

Thanks gumby for your info and ideas
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Old 02-07-2013, 04:44 PM   #8 (permalink)
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Quote:
Originally Posted by thaylog View Post
sorry the pics are so bad. not sure how to re-size them
Perfect, thanks!

Crazy threads for sure. I guess when you're threading between barrel threads you have to get small. Very interesting.
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Old 02-07-2013, 05:30 PM   #9 (permalink)
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Boring can be thought of as increasing the inner diameter, turning can either increase the inside or decrease the outside diameters.

The end of the barrel would need to be shortened so the distance between the major threads and the point of contact with the unisizer allows for the total distance between the major threads and the contact point of what would be the end of the barrel to remain the same. So basically you would be cutting off the length that the unisizer is adding to the overall length.

Then you would have the outside diameter decreased for a short portion, the length of the minor - tiny - threaded distance inside the unisizer. Then instead of cutting threads on the end of the barrel you have a diameter that is almost the same as the high points on the unisizer threads. This way you don't actually thread the sizer on, you push it on and it stays there with friction.
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Old 03-19-2013, 02:26 PM   #10 (permalink)
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Gumby, out of curiosity, why did ATS settle on such an odd threading for their barrels/unisizers?
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