Minor rant on "standard" threads

[Sharky]

So I decided to make a couple one-piece cleaning rods for shotguns.

When I looked up the thread for the shotgun bore brushes I came up with:

5/16-27 "standard-US"

Seriously.... "STANDARD?"

Who's bright idea was that thread pitch?
I did find a HSS tap that size.... Only $28.00.... Only....

I wonder how hard it will be to single point my new cleaning rods...

 

[Walltoddj]

How about the 1/2-28 and 9/16-32 for gun barrels. At least I can single point those!

Todd

 

[RandyM]

5/16-27 UNS = Unified National Special.

I'd give you dimensions but, you do not specify internal or external. Or is this just a rant?

 

[brasssmanget]

I would guess internal since he mentioned bore brushes as a problem and finding a tap for the threads - could be wrong though, as I'm running about 50/50 on my guesses. :thinking:

 

[Ray C]

LOL... Yeah, you gotta wonder why things are weird like this. Actually, odd thread sizes don't come up for me too often but, I do run into tight tolerances on thread class once in a while. Just about anyone can thread a bolt to fit a nut but when someone wants a class 2 thread in the upper (tighter) 25% of the specification, it needs your close attention and sometimes I need to scrap the part.


Ray

 

[Big Rack]

Even worse their seems to be two different thread pitches for cleaning rods so you end up with different brands and nothing fits nothing. Or at least when I try anyway.

 

[Sharky]

Started as a rant but I did consider single point threading the internal thread onthe rod. I did find a tap for only 11.00 so now thinking that is the way to go. I'm not feeling to excited about 5/16 internal single point threading attempts right now. Especially when there is an $11 solution. Thanks. On to my next cluster....