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I need some advice from a bolt enthusiast or machinist!! All set, thanks!!

Most likely is 1/2 28 but it’s hard to tell from the picture. You have to remember that the threads aren’t cut with a die. So when the gunsmith was threading your barrel for the break he would of just kept chasing your threads till the break screwed on with very little tolerance. So more than likely the threads in your thread protector are too deep for the threads in the barrel. Basically what I’m trying to say is if you go to the hardware store and buy a 1/2 28 nut they have to make it with enough tolerance to thread onto any 1/2 28 bolt this isn’t the case when your machining something like the break or barrel.
 
mike7tcu said:
Most like is 1/2 28 hard to tell from the picture. You have to remember that the threads aren’t cut with a die. So when the gunsmith was threading your barrel for the break he would of just kept chasing your threads till the break screwed on with very little tolerance. So more than likely the threads in your thread protector are too deep for the threads in the barrel. Basically what I’m trying to say is if you go to the hardware store and buy a 1/2 28 nut they have to make it with enough tolerance to thread onto any 1/2 28 bolt this isn’t the case when your machining something like the break or barrel.
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This makes the most sense, so now what? Thanks
 
rhagenw said:
Oh wow! Shocked he doesn’t know! My vote is a machine shop or gun smith I would cry if I damaged a high end custom rifle lol
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I just keep getting office help, the machinist is off work or some emergency, but yea I am too, its an older model.
 
If that is a 30 caliber, I would wager to say that the threads are 5/8-24. 1/2” threads are usually only used for smaller calibers so that you are able to maintain enough meat on the barrel to be safe. Do the math..... .500 - .308 is would leave the barrel paper thin after cutting the threads...... just my .02c
 
boyne bowhunter said:
Those are mighty fine. I wouldn't rule out 1./2-32 Are you only measuring the length of the thread for your 1/2 in length or are you including the unthreaded portion near where the barrel gets big again? 13-14 threads at a 32 pitch would be .400 to .438 length of the actual threads.

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Bingo!! Boyne hunter gets a case a beer on me when he hits the Adk’s sometime, I believe you nailed it, I got out my reading glasses and flash light and I was measuring a hair past the threads I believe, I do think you are correct Sir and I will order another one
 
15 minutes of Saddlehunter and I am back in business! Thanks guys for all the help I am more than greafull!
 
Topdog said:
Bingo!! Boyne hunter gets a case a beer on me when he hits the Adk’s sometime, I believe you nailed it, I got out my reading glasses and flash light and I was measuring a hair past the threads I believe, I do think you are correct Sir and I will order another one
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It's almost impossible to thread completely to the edge so typically the last couple of threads are undercut and missing.
 
Topdog said:
This makes the most sense, so now what? Thanks
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Well I would probably order another thread protector and maybe you’ll get lucky and it’ll work. Other wise you could take the break and the protector to a gunsmith, I have him run another pass to make the the threads a little deeper, or just have him cut the half inch of threads off and crown it for you. Chasing those threads won’t be an easy job for him honestly would be harder than installing a new break so that option will be somewhat pricey.
 
gameflogger said:
If that is a 30 caliber, I would wager to say that the threads are 5/8-24. 1/2” threads are usually only used for smaller calibers so that you are able to maintain enough meat on the barrel to be safe. Do the math..... .500 - .308 is would leave the barrel paper thin after cutting the threads...... just my .02c
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I agree with you, yes its paper thin, I had a NULA one time in 300 win mag you should have seen how thin that was!
 
boyne bowhunter said:
It's almost impossible to thread completely to the edge so typically the last couple of threads are undercut and missing.
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Yup you made my day, thanks, I was taking more measurements when you posted your picture which was exactly what I was doing wrong, thanks so much!
 
MNHunter1827 said:
That's a normal caliper. Isnt the needle on 50 when its fully closed?
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The dial goes around once for each of the large divisions on the main bar. It starts at zero on 5. When it gets to zero on the main bar it should be zero again.
 
mike7tcu said:
Most likely is 1/2 28 but it’s hard to tell from the picture. You have to remember that the threads aren’t cut with a die. So when the gunsmith was threading your barrel for the break he would of just kept chasing your threads till the break screwed on with very little tolerance. So more than likely the threads in your thread protector are too deep for the threads in the barrel. Basically what I’m trying to say is if you go to the hardware store and buy a 1/2 28 nut they have to make it with enough tolerance to thread onto any 1/2 28 bolt this isn’t the case when your machining something like the break or barrel.
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Get one of these and never guess again. It’s totally worth the $..... you will use it again some day.
E3B719AE-2335-4802-8AAD-2237CC20AD1E.jpeg
 
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