Barrel threading dies

[3DGearGuy]

So, I decided to add a muzzle brake to one of my rifles. I've measured my barrel and know I need a 5/8-24 muzzle brake. Here's where I'm confused though..... When I search for 5/8-24 dies, I'm not sure if I need UNF or UNS dies and the muzzle brakes are listed as 5/8-24 with no other designation.

What is the standard for muzzle brakes? UNS or UNF? or are these two thread standards close enough in pitch to where I can use either (I doubt that's true, but I thought I'd ask).

Thanks in advance!

[klewan]

It's UNF. UNS is some oddball standard.

[kcstott]

It's UNF. UNS is some oddball standard.

5/8" -24 is not UNF it UNS
UNS is not some odd ball standard

UNC= Universal National Course
UNF= Universal National Fine
UNS= Universal National Special


5/8"- 11 is UNC
5/8"-18 is UNF
5/8"-24 is UNS


And good luck using a die to cut threads on a barrel. Pay the money and have it threaded on a lathe you will be far more pleased with the outcome

[shafferds]

Have someone who knows what they are doing use a lathe as kcscott said. Do it right or you will end up with a messed up barrel end.

[Nathan Krynn]

So, I decided to add a muzzle brake to one of my rifles. I've measured my barrel and know I need a 5/8-24 muzzle brake. Here's where I'm confused though..... When I search for 5/8-24 dies, I'm not sure if I need UNF or UNS dies and the muzzle brakes are listed as 5/8-24 with no other designation.

What is the standard for muzzle brakes? UNS or UNF? or are these two thread standards close enough in pitch to where I can use either (I doubt that's true, but I thought I'd ask).

Thanks in advance!

Last week a customer sent a picture from the local range. It was his custom bolt gun he bought and he decided to add a muzzle break himself by doing just this. Yeah his barrel looks like one from a 1960's cartoon peeled back because the first bullet hit the muzzle break.

Take it to someone with a lathe.

[RandyD]

Pay the money and have it threaded on a lathe you will be far more pleased with the outcome

kcstott did an excellent job in threading my Krieger barrel and installing a brake.

[tujungatoes]

You're in LA. Take it to Randall and he'll do a pro job while you wait.

[3DGearGuy]

Who's Randall?

The problem is that this barrel is pressed in, so it's not as easy as unscrewing it and screwing it back in when its done. Press operations get a little tricky with setup and creating jigs to hold things straight and support the receiver.


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[kcstott]

Who's Randall?

The problem is that this barrel is pressed in, so it's not as easy as unscrewing it and screwing it back in when its done. Press operations get a little tricky with setup and creating jigs to hold things straight and support the receiver.


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Really So how many AK's have you done?? Or PLS's or RPK's for that matter.

and that goes to show you what you know about lathe work too.

You see you can set up a receiver in a four jaw chuck with a dead center and brass support bushing in the bore and single point thread it. The barrel doesn't have to be removed from the receiver if set up on the right piece of equipment.

Now my question to you, how do you plan to get the barrel OD down to .625" accurately without a lathe? and how do you plan to hold the die straight??

You know threading dies do not cut the OD to the correct diameter before they cut the threads???

[3DGearGuy]

Barrel threading dies

1) I've only built one AK

2) I don't have much experience with a lathe, so excuse me for not understanding everything about what is and what's not possible on a lathe.

3) The barrel diameter can be reduced with an annular cutter without the need for a lathe.

4) Yes, I'm aware how threading dies work and I don't expect to thread a barrel that measures .660 with a 5/8-24 die; that's where the annular bit comes in.

5) Why is everyone so quick to attack people for asking questions? The point of a forum is to learn from each other...I obviously don't know the ins and outs of barrel threading or else I wouldn't be asking on here. I appreciate your enthusiasm, but it's not necessary to belittle me (or anyone else on the forum) for your knowledge or my (our) lack thereof.




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[tujungatoes]

Who's Randall?

The problem is that this barrel is pressed in, so it's not as easy as unscrewing it and screwing it back in when its done. Press operations get a little tricky with setup and creating jigs to hold things straight and support the receiver.


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randall is calgunner ar15barrels. I'm sure he can get you handled. This is what he does. speaking of which. What type of rifle is this?

[baih777]

Randall website

http://ar15barrels.com/

he is van nuys. you can make an appointment and he does it while you wait. additional fee and he can time the brake also.

[rkt88edmo]

Last week a customer sent a picture from the local range. It was his custom bolt gun he bought and he decided to add a muzzle break himself by doing just this. Yeah his barrel looks like one from a 1960's cartoon peeled back because the first bullet hit the muzzle break.

Take it to someone with a lathe.

[milotrain]

No one is attacking you, everyone is trying to protect you from yourself. It was friendly, then "yourself" decided it really wanted to banana peal your barrel, so "everyone" made it a point of suggesting that you shouldn't take "yourself's" advice because it's not based on facts or an understanding of the process.

ignore at your peril

One tends to walk into a sh*tstorm when they show up and ask a jumped question. Like "where do buy Lead azide to make primers". The question betrays two things. 1. you don't know what you are really asking and 2. you may be a danger to yourself. It's much better to ask "Is it possible to make your own primers at home?" at which point most people will tell you that primer manufacture involves a wonderfully exothermic section of organic chemistry and that it should be avoided.

[heidad01]

1) I've only built one AK

2) I don't have much experience with a lathe, so excuse me for not understanding everything about what is and what's not possible on a lathe.

3) The barrel diameter can be reduced with an annular cutter without the need for a lathe.

4) Yes, I'm aware how threading dies work and I don't expect to thread a barrel that measures .660 with a 5/8-24 die; that's where the annular bit comes in.

5) Why is everyone so quick to attack people for asking questions? The point of a forum is to learn from each other...I obviously don't know the ins and outs of barrel threading or else I wouldn't be asking on here. I appreciate your enthusiasm, but it's not necessary to belittle me (or anyone else on the forum) for your knowledge or my (our) lack thereof.
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idlplumb, Please do not be offended. Sometimes the tone of advice sounds harsh and I'll take it that they are eager to help and want to make sure you do not go down the wrong path and ruin your rifle.
Now, you sound to be familiar with tools and may very well be able to do what you are planning with the die. However, it is extremely difficult if not impossible to get the threads cut cleanly and most importantly Concentric to the barrel bore and the cost of a high quality die will perhaps pay for the service. I hace cut threads on a lathe and with dies and the outcome shows a world of difference.
That said, I will also suggest to have it done by someone who does this as a routine operation and has the machinery set up for it. I have not worked with Randall but have seen his work on friends' ARs and some of these guys are pickier than me on perfection. I do not remember the cost they mentioned but it was so low that it surprised me. It is worth a call to get a quote and he may not have to take the barrel out to do the threading.
Good luck to you.