Help me understand a thread guage NS marking

[Shawnba67]

I have been looking around trying to find affordable thread guages for my smithing hobby. I have found online a 5/8 24 NS no go guage it stayes its pitch is .5949 which is the class 3a no go pitch diameter. I searched online for the meaning of the NS designation. There was some info on it being an obsolete thread spec and some on it being non-standard. I dont want to waste any of my money if this isnt going to be what i need Any helpful advise is appreciated

 

[jdh47]

It is a special thread. Normal tap drill sizes are 5/8-11 NC (coarse), 5/8-18 NF(fine).

 

[RWO]

Why would you want it? In my experience, thread gauges are only useful in a production scenario, the exact opposite of the typical gunsmith's activity.

RWO

 

[Shawnba67]

Why would you want it? In my experience, thread gauges are only useful in a production scenario, the exact opposite of the typical gunsmith's activity.

RWO

To triple check, and verify what my thread mic says. Ring Gage's are hard to misinterpret. And they will verify my measuring accuracy. I want to be cutting to spec threads
Custom threads for one off fit are great until his new toy won't go on the non spec threads. Then your in a bind.

 

[Shawnba67]

Mostly want to verify that a NS gage for 5/8x24 of the correct pitch diameter will work as it should on Unef threads. I think it will but I'm wrong occasionally.

 

[Steve morgan]

Mostly want to verify that a NS gage for 5/8x24 of the correct pitch diameter will work as it should on Unef threads. I think it will but I'm wrong occasionally.

Ns means national special

 

[oldpup223]

Ns means national special

National Standard

 

[shortgrass]

Steve Morgan is correct, National Special. This an obsolete term which has been replaced by UNS,,,,, Unified National Special. This was done to 'unify' thread standards in counties that use inch measurement. UNS is fully compatible with NS. A gauge should not be required as quality firearms work is always done on a one on one basis.

 

[akajun]

National special
There are also NC national course
Nf national fine
Unef
Unified national extra fine
All is explained in Machinerys handbook

Steve Morgan is correct, National Special. This an obsolete term which has been replaced by UNS,,,,, Unified National Special. This was done to 'unify' thread standards in counties that use inch measurement. UNS is fully compatible with NS. A gauge should not be required as quality firearms work is always done on a one on one basis.

 

[hogpatrol]

Don't forget those Whitworth threads on the Mausers. English pitch too, 1-12.

 

[DaveTooley]

Your thread mic provides more information than a ring gage. Such as where in the min and max pitch diameter are your threads. I've done threads in spec but on the max limit and had interface problems with the next device. I've chambered and threaded muzzles on more than 5500 barrels and counting in the last 8 years just using thread mics and drawings with thread specs. I never had a problem. Trust your micrometer.

 

[RussellJ]

I have been looking around trying to find affordable thread guages for my smithing hobby. I have found online a 5/8 24 NS no go guage it stayes its pitch is .5949 which is the class 3a no go pitch diameter. I searched online for the meaning of the NS designation. There was some info on it being an obsolete thread spec and some on it being non-standard. I dont want to waste any of my money if this isnt going to be what i need Any helpful advise is appreciated

NS = NS American National Thread-Special. This information is from the USCTI Table 301B

 

[Shawnba67]

Steve Morgan is correct, National Special. This an obsolete term which has been replaced by UNS,,,,, Unified National Special. This was done to 'unify' thread standards in counties that use inch measurement. UNS is fully compatible with NS. A gauge should not be required as quality firearms work is always done on a one on one basis.

One on one basis . So when you chamber a barrel do you fit it to something one off, or do you use go no go guages so your sure it fits what it's supposed to? How is my desire to double check different? They all have a spec they are supposed to be don't they.

 

[shortgrass]

One on one basis . So when you chamber a barrel do you fit it to something one off, or do you use go no go guages so your sure it fits what it's supposed to? How is my desire to double check different? They all have a spec they are supposed to be don't they.

I am a school trained gunsmith. I graduated from MCC 25yrs ago. I have been machining since 1974. ALL of my gunsmith threading is done on a one to one basis. My thread mic tells me much more than any ring gauge can. Ring gauges are for production work. There is a GO and a NO-Go. I still work in a job shop, I only gunsmith part time. Still, I probably install more custom barrels and thread more muzzles than many do. I gunsmith part time because I do not have to deal with many interdnet amateurs that way and can pretty much work by referrals. Your desire to double check with a ring gauge is a waste of time and money. And I , for one, do not like waste... Just how do you know the thread in the receiver or muzzle attachment is to "spec". Are you just taking this for granted that it is? Get a grip, man! You are trying to make this more complicated and difficult than it is!

 

[222 rem]

I have been looking around trying to find affordable thread guages for my smithing hobby. I have found online a 5/8 24 NS no go guage it stayes its pitch is .5949 which is the class 3a no go pitch diameter. I searched online for the meaning of the NS designation. There was some info on it being an obsolete thread spec and some on it being non-standard. I dont want to waste any of my money if this isnt going to be what i need Any helpful advise is appreciated

Interesting no one mentioned using the three wire method.

 

[hogpatrol]

I have been looking around trying to find affordable thread guages for my smithing hobby. I have found online a 5/8 24 NS no go guage it stayes its pitch is .5949 which is the class 3a no go pitch diameter. I searched online for the meaning of the NS designation. There was some info on it being an obsolete thread spec and some on it being non-standard. I dont want to waste any of my money if this isnt going to be what i need Any helpful advise is appreciated

Are you making close tolerance fasteners? In a production environment (CNC making in excess of 1000)? And need class 3A fits? If not, it would be a waste of your money buying a ring gauge for gunsmithing work.

 

[shortgrass]

Interesting no one mentioned using the three wire method.

Most can barely use a micrometer, add 3 wires and?????

 

[Shawnba67]

Thank you to All who offered advise.
Please remember some of us come here to try and learn, and even feel a little like this is a big family.
A question only seems stupid when you already know the answer.

 

[hogpatrol]

Thank you to All who offered advise.
Please remember some of us come here to try and learn, and even feel a little like this is a big family.
A question only seems stupid when you already know the answer.

So, are you going to buy the ring gauge(s)?

 

[shortgrass]

"Some of us come here o learn",,,,, this seems to be the standard answer. If you truly want "to learn" quit your job and go to a tech school to learn the trade. Get a job in a machine shop, not just a CNC shop, a "job shop", where both manual and CNC exist, side by side. Then you will start to 'learn'. Trying to learn on the interdnet is !^$(^#&!. Another reason why I do NOT visit these 'gunsmith' forums/boards very often, anymore......