?? Inquiry size of joint pin ??

[cue fix]

Hello. I would like to know what size the joint pin is that is in the shaft. The shaft is an old spliced shaft. My calipers read the pin as .315" wide and roughly 12-13 threads per inch that I can tell. The pin is 1 1/2" long. Where can I get a pin like this?

 

[stevel]

Looks to be a 3/8 x 10 to me. You can get them at Atlas Billiard Supplies.

 

[desi2960]

agree with steve

looks like a 3/8 by 10, and i might suggest when you take photos of a pin again, try to get a set of digital calipers and hold the calipers next to the pin. the photos with the tape away from the pin makes to hard to count the threads per inch.

 

[cueman]

If it is .315" outside diameter that is a metric 8mm screw. So now figure out how many mm each thread is and you will know what you have.
Where you will find what is most likely not even a standard Metric screw, I do not know. Except to tell you to have one made at your local machine shop.

 

[desi2960]

mr hightowers right again

and i was wrong. here are photos of a 3/8 by 10 pin not the same as op's pin photos

 

[desi2960]

forgot one photo

lllooonnnggg dddaaayyy

 

[cue fix]

Cueman you may be right about a metric screw. Here are more pictures with inch measurements. I compared it to my 3/8X10 pin and the old pin is .05" narrower and the measurement of each thread is the same.05" closer together on the old pin. I could not thread it on my 3/8X10 joint protector or screw my 3/8X10 butt into the old cue. So, if it is metric can I buy a screw somewhere? preferably at a hardware store, as I am not a cuemaker.

 

[cue fix]

another picture. I measured using MM and it is 8mm wide and the space between threads measured on the outer sharp edge is 2.5mm and deep in between threads is 3.5mm

 

[KJ Cues]

From all info provided, I'm going to suggest that it's an 8x2mm.
From the hardware, not going to happen. Even by metric standards this is a bastard.
Have the pin & the hole changed and be done with it.

KJ

 

[conetip]

That is a special made pin. M8 does not go that course in the thread pitch.
Metric threads are measured by pitch in mm , not t hreads per inch.
Set your caliper to mm then measure as many threads as you can and read off the dimension. Divide by the number of threads and that is your pitch.

There have been threads made where the outer diameter is made to a metric size, while the pitch is don on what the machine could easily do, be it a TPI or picth.

Use thread pitch gauges to find if it is 60 deg thread angle or 55 deg or even 47.5 deg.
An engineering shop with a shadow graph will be your best bet to get the read info and form.

Neil

 

[NY9912]

deleted - 7/25/2020

 

[Lexicologist71]

Given that 5/16 is 0.3125 and the parallax shift in the pic makes it hard to determine exactly how many threads/inch exist combined with the similarity to the threaded rod I own, isn't it slightly possible it is 5/16-14 ?

After looking again, there's no way, so never mind.

 

[Vince_Former_BB]

Absolutely concur with those who suggest it's a bastard 8 mm. Definitely not 3/8 (.375) nor 5/16 (.3125). 8mm x .03937 = .31496 Also agree that it was more than likely made on an American lathe or screw machine that only has TPI options which will give you anomalies over the length. If you look at the last several threads there are some flats that could account for someone in the past trying to figure out the same thing by threading on a steel 5/16 nut which crunched those last threads. I'm assuming it's a brass pin for that scenario. Honestly..........I'm shocked I remembered the conversion .03937

 

[cue fix]

I agree with KJ here, unless it would significantly devalue the cue.

The beauty of it is, swapping in a 3/8-10 should not require much more than boring and tapping what's already there.

Just out of curiosity, what kind of cue are we talking about here?

The cue is probably an early 1900 grooved handle merry widow. I am looking for a 3" pin of this measurement so I can use a different shaft with the cue. I already shoot with the cue, but it is a little stiff hitting with the full splice shaft. This pin is really close to a 3/8X10 pin as I have mentioned in an earlier post. I will not retap the cue for a different pin as suggested by KJ. If I cannot find a pin I will just continue to use the original shaft. I also want to say THANK YOU to all who have replied to my inquiry.

 

[NY9912]

deleted - 7/25/2020