What Joint Is This?

[x3dnd3x]

Hi all,

As mentioned in thread title, would anyone enlighten me is this a 5/16x18 joint? I've tried to fit my 2 brandless cue shafts and they wouldn't fit. My playing and break cue are both 5/16x14. But when I used a Dufferin shaft, its able to twist in but it doesn't go all the way in. My Dufferin is also a 5/16x14. The cue butt shown in the picture is also a brandless one that my friend gave me and he also have no idea what joint it is.

The reason why I'm asking is because I'm intending to order a break shaft on Ebay. Its in the link as below but yet I'm afraid it wouldn't fit then I would waste my money.

http://www.ebay.com/itm/111177816171

Anyone knows?

 

[MOJOE]

How about a picture from the top? Is it piloted?

 

[DallasHopps]

It looks like it, but if you want to be sure you could go to lowes or Home Depot and pick up a 5/16-18 bolt to compare.

 

[x3dnd3x]

How about a picture from the top? Is it piloted?

Is this picture better for you?

I have no idea whether its piloted or not. I only have the cue butt.

 

[x3dnd3x]

It looks like it, but if you want to be sure you could go to lowes or Home Depot and pick up a 5/16-18 bolt to compare.

I googled online and they say you could actually count the threads? I counted and it didn't seem to have 16 or 18 though. Let's say I'm able to screw a 5/16x18 joint protector in, means its that thread?

 

[Shannon.spronk]

I googled online and they say you could actually count the threads? I counted and it didn't seem to have 16 or 18 though. Let's say I'm able to screw a 5/16x18 joint protector in, means its that thread?

Yes you can figure it out yourself. The 5/16 refers to the width of the pin. The other number be it 14 or 18 or whatever refers to the threads per inch. If I was you I would take it to my local pool hall and ask around. Guaranteed that someone there will be able to tell you pretty quickly.

 

[Hunter]

It looks like a 5/16-14 (not 5/16-18 for sure) to me, but there are different versions of this thread. Schon is one that does it and shafts aren't interchangeable with standard 5/16-14s...

 

[x3dnd3x]

Yes you can figure it out yourself. The 5/16 refers to the width of the pin. The other number be it 14 or 18 or whatever refers to the threads per inch. If I was you I would take it to my local pool hall and ask around. Guaranteed that someone there will be able to tell you pretty quickly.

I counted like 14 or 15 but my 5/16x14 shaft couldn't fit.

 

[x3dnd3x]

It looks like a 5/16-14 (not 5/16-18 for sure) to me, but there are different versions of this threads. Schon is one that does it and shafts aren't interchangeable with standard 5/16-14s...

The cue butt is a brandless one from Taiwan. My friend doesn't remember who's the cue maker as well. He bought it in a shop.

 

[Hunter]

Does it screw in until it reaches the pilot? Usually, I think that is the difference. A Nova has larger pilot than a typical 5/16-14, so it will screw onto the pin but cant seat properly because the pilot is too big.

 

[x3dnd3x]

Does it screw in until it reaches the pilot? Usually, I think that is the difference. A Nova has larger pilot than a typical 5/16-14, so it will screw onto the pin but cant seat properly because the pilot is too big.

Both of my 5/16x14 shafts can't even screw in. The Dufferin gets stuck around the middle of the thread.

 

[Hunter]

Lots of Duffs use a 5/16-18 pin. You sure yours is a 5/16-14?

 

[Hunter]

Here's a chart that explains the differences in pin sizes and styles.

http://www.pooldawg.com/article/pooldawg-library/what-s-my-joint-size

 

[x3dnd3x]

Lots of Duffs use a 5/16-18 pin. You sure yours is a 5/16-14?

Well, it could fit some 5/16x14 shafts but can't fit a 5/16x14 3142 or WD700 Mezz united.

 

[Ralph Kramden]

It looks like it, but if you want to be sure you could go to lowes or Home Depot and pick up a 5/16-18 bolt to compare.

Good advice. Use a bolt, not a nut. The nut is not long enough to check and could screw onto either thread.
The bolt will have a longer threaded area. There isn't much difference between 14 and 18 threads per inch.

 

[bbb]

dont know what pin it is but to add to the confusion there are ACME pins that have the same numbers but dont firt the standard versions
i beleive

 

[pwd72s]

Could it possibly be metric????

Counter people in stores that sell fasteners (nuts & bolts) usually have gauges that measure size & thread pitch.

 

[cuesblues]

It is not an Acme thread
I just threaded a Dufferin 5/16-14 thread onto a Joss West and a Schon with no problem.
If it is in fact a 5/16-14 thread as it appears, it is very odd that the 314-2 shaft doesn't fit, because the ones I've had over the years fit everything.

 

[mrjobe]

Good advice. Use a bolt, not a nut. The nut is not long enough to check and could screw onto either thread.
The bolt will have a longer threaded area. There isn't much difference between 14 and 18 threads per inch.

Thats actually quite a bit of difference, an extra 4 threads per inch is about 25%.

No way they fit each other.

I'd take your butt to a hardware store and try to fit nuts on until you find the winner.

Do you have a set of calipers? If so just meassure 1/2" of the pin and count the full threads then x2.

I count 10 full threads, so if the threaded portion of the pin is 3/4"ish long that would equal a 14 TPI thread. If its closer to 1/2" of threads your looking at the 18 pitch thread.

 

[rayjay]

Have you tried a 3/8x14?