Extension Bumper

[LocalArtist]

Does this look like a familiar bumper brand to anyone? It’s in my collection of random bumpers so I’m not sure where it came from. I’m looking to install it but can’t find the thread count. Would I need to live thread the bumper onto the butt or do they make a tap this size? Minor diameter is .569, major is .618

Shooter 1= Stelzenmuller, Titleist conversion-Z2

Shooter 2= Bob Frey, Bacote sneaky

 

[Kim Bye]

Looks like the type of bumper that come with many of the aftermarket Mezz and Predator extensions. Those are 5/8-11. Only way to know for sure is with a thread pitch gage.

 

[LocalArtist]

Okay, perfect. I just got the excuse I needed to buy more tools.


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[tomatoetom]

Where do you get that bumper? Thanks

 

[Canadian cue]

Those threads are a bastard thread, they are not imperial. They are non nominal size metric pitch. So good luck finding a tap, you need to cut them on the lathe or have a custom tap built. The predator ones are a little easier. They are a M16*1.5 pitch but slightly undersize, a conventional tap will work but the threads are on the loose side. From a manufacturers stand point they don't want other makers using their hardware to build cues with. What we need as small number cue builders is someone to manufacture the rubber part of the bumper in mass and sell them at a reasonable price. Not hard to turn the hardware from aluminum.

 

[Michael Webb]

Mezz...... M14x2
Predator... M16x1.5
Install phenolic plugs first. Cleaner and stronger threads.
I'm sure there's others.

 

[Canadian cue]

Mezz...... M14x2
Predator... M16x1.5
Install phenolic plugs first. Cleaner and stronger threads.
I'm sure there's others.

Not to be disagreeable but....

 

[Kim Bye]

Not to be disagreeable but....

Mezz and Exceed are both M14x2. You bore to 12mm, then tap the hole. I like to make a nice 60 degree chamfer first.

 

[Michael Webb]

Not to be disagreeable but....

What part do you disagree with? I put phenolic inserts all my cues. They can change the bumper as much as they want without fear of stripping the wood.
I would like to agree with you. Just clarify what part??

 

[Canadian cue]

The mezz bumpers are not a 14mm. They are slightly bigger than 13mm. That isn't a standard thread size. I thought the pics would clarify that. My apologies if they didn't.

 

[Dave38]

The mezz bumpers are not a 14mm. They are slightly bigger than 13mm. That isn't a standard thread size. I thought the pics would clarify that. My apologies if they didn't.

If Mike and Kim both say the tpi is 14 x 2, I believe them.

 

[Canadian cue]

If Mike and Kim both say the tpi is 14 x 2, I believe them.

 

[Michael Webb]

The mezz bumpers are not a 14mm. They are slightly bigger than 13mm. That isn't a standard thread size. I thought the pics would clarify that. My apologies if they didn't.

Ok. Thank you.
I needed to repair a Cue for a Mezz bumper. I asked and was told M14x2. I bought the tap, the fit was very good. I was happy, the customer was happy.
Job completed. All good.
Thank you for the clarification. I appreciate you.

 

[BarenbruggeCues]

I believe what you occasionally run into is that the minor and major tolerances are already built into certain dies and taps.
13.(almost 3) should thread into a 14 tap hole with about the right amount of tolerance.
For instance ...unless they're special made, a 3/8 tap rarely measures .375 from what I have found. Usually larger into the .380 range

Food for thought..........

I run a lot of "bastard" threads in my cues so I can get the fit I'm looking for depending if glue is involved or not.

 

[Canadian cue]

So just for clarification, according to the Machinery handbook which is pretty much the Machinists Bible the pitch diameter of a M14x2.0 should be between 12.663 mm and 12.503 mm. I measured the pitch diameter of the Mezz bumper and it is 11.709. Which is a mile out of tolerance for an M14 thread. So it is indeed a bastard thread. Which was my point from the start. Yeah the bumper will thread into a hole threaded for an M14 but it will be beyond loose. To put it into imperial numbers we are talking 0.024" under size on the pitch diameter.
This is a good example of where people rely on what they read on the forums and take it as fact. The manufacturers like Mezz don't want to share their hardware with everyone else, tried buying the wavy pin tap lately. They obviously build there own tooling to fit their hardware. This industry is riddled with proprietary stuff. Just look at all the ridiculous thread pitches that are being used.

 

[Michael Webb]

So just for clarification, according to the Machinery handbook which is pretty much the Machinists Bible the pitch diameter of a M14x2.0 should be between 12.663 mm and 12.503 mm. I measured the pitch diameter of the Mezz bumper and it is 11.709. Which is a mile out of tolerance for an M14 thread. So it is indeed a bastard thread. Which was my point from the start. Yeah the bumper will thread into a hole threaded for an M14 but it will be beyond loose. To put it into imperial numbers we are talking 0.024" under size on the pitch diameter.
This is a good example of where people rely on what they read on the forums and take it as fact. The manufacturers like Mezz don't want to share their hardware with everyone else, tried buying the wavy pin tap lately. They obviously build there own tooling to fit their hardware. This industry is riddled with proprietary stuff. Just look at all the ridiculous thread pitches that are being used.

I shall see. I just ordered an
M13x2 tap.
The wavy screw tap is available from 2 sources. One here in the U. S. And one from China.

 

[Canadian cue]

Sure the wavy pin is available for 436$...as for the Chinese knock off I guess you would have to buy one and find out how good it is. With the Chinese stuff it is always a gamble. Just picked up a tail stock for an indexer and it was a Chinese knock off. Looked great at first appearances, then started to measure and indicate the various reference surfaces and it was total crap.

 

[Michael Webb]

Sure the wavy pin is available for 436$...as for the Chinese knock off I guess you would have to buy one and find out how good it is. With the Chinese stuff it is always a gamble. Just picked up a tail stock for an indexer and it was a Chinese knock off. Looked great at first appearances, then started to measure and indicate the various reference surfaces and it was total crap.

Hahahaha
The correct answer is, and always has been.
Pay now or pay later.
My Industry humor!

 

[Michael Webb]

The mezz bumpers are not a 14mm. They are slightly bigger than 13mm. That isn't a standard thread size. I thought the pics would clarify that. My apologies if they didn't.

I bought an m13x2 tap. I'm lucky the Mezz bumper didn't rip apart. I'll stick with the m14x2.

 

[cueman]

Looks like the type of bumper that come with many of the aftermarket Mezz and Predator extensions. Those are 5/8-11. Only way to know for sure is with a thread pitch gage.

If you don't have a thread gage take it to the hardware store and see if it fits and of the nuts there.