reciever to barrel tolerances


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Old 06-26-2012, 11:16 PM   #1
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Default reciever to barrel tolerances

let's say I had to fit a barrel to a reciever. What would the acceptable tolerances be for the fit? Numerical figures, please.
How loose is too loose and how tight is too tight?



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Old 06-26-2012, 11:29 PM   #2
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Interesting question from someone all primed to launch their own
firearms manufacturing business.

What kind of fit? Press? Threaded? Slip? Interrupted thread?

Tolerance between what parts?



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Old 06-26-2012, 11:38 PM   #3
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Interesting question from someone all primed to launch their own
firearms manufacturing business.

What kind of fit? Press? Threaded? Slip? Interrupted thread?

Tolerance between what parts?
For this - let's use the mauser 98 as an example, being threaded with a non-interupted thread. With the barrel being 4140, and the receiver being made of the same - what would the tolerance be for safety?
or- how tight is too tight?
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Old 06-27-2012, 12:11 AM   #4
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Hmmm. Interesting choice on the Mauser 98. It appears that it has a
seating surface that is NOT the front of the receiver.

http://www.mausercentral.com/barrelfitting.htm

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Old 06-27-2012, 12:14 AM   #5
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There is no real tolerance. It can not be loose at all. I guess I never had the ability to see how many foot-pounds of torque I used to seat the barrels. I just turned them in tight. I know I got some tighter than others.

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Old 06-27-2012, 02:12 AM   #6
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Hmmm. Interesting choice on the Mauser 98. It appears that it has a
seating surface that is NOT the front of the receiver.

http://www.mausercentral.com/barrelfitting.htm

I'm only using the mauser as an example. And according to the comment right about mine the barrel cannot be loose. I figured that bit, so I'll rephrase the question as I should have written it in the beginning...

at what measurment in inches (.001), does a threaded part made of steel become noticeably harder, or very difficult, to put in?
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Old 06-27-2012, 02:16 AM   #7
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Do yourself a favor and just ask your question straight out. What are you working on? If you just say, how hard do I have to torque an AR barrel on? You will get an answer much faster.

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Old 06-30-2012, 12:59 AM   #8
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MB,

If I understand your question correctly, all the info you need regarding thread form/pitch/buttress-root clearance, etc. can be found in the Millwrights & Machinists Handbook. OTOH, "torque" - as measure of "tightness" - would depend upon a number of variables, not least of which would be the material/style of receiver the barrel is being threaded into. >MW



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