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Old 11-30-2018, 08:34 AM   #1 (permalink)
 
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I'm trying to id a screw thread. The major diameter is 7.09mm / 0.279". It's a perfect fit with an 18tpi gauge (which would be around 1.4 metric pitch). Looking for a tap:

M7x1.4 is not something I could find off the shelf
5/16-18 is too big.
9/32-20 won't work.

Anyone recognize this thread and know where I could find a tap? Having a custom tap made would not be worth it for this project.

I am making some Berea pizza cutters for holiday gifts. I was planning to use a metal / resin blank with the cutter frame screwing directly into the metal part and not using the threaded insert included in the kit. Using epoxy to set the insert in the metal doesn't seem like a very good solution to me. Maybe I'll just have to switch to some segmented wood handles instead.

Berea was no help. I suspect they are just reselling a kit they buy in bulk somewhere and they didn't do the design.

Any and all help appreciated.

Ed
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Old 11-30-2018, 08:46 AM   #2 (permalink)
 
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It doesn't even show up on any of the standard tap charts or at McMaster. It's got to be a special.

I've wanted threaded inserts of odd sizes before too (for a semi-kitless pen project.) They don't seem to be generally available without just cannibalizing a kit. I'd love to know of a source for these oddballs too.

Gary
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Old 11-30-2018, 10:16 AM   #3 (permalink)
 
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if it is some thing you could carry into the hardware store, they should be able to figure it out for you
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Old 11-30-2018, 10:25 AM   #4 (permalink)
 
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Originally Posted by gimpy View Post
if it is some thing you could carry into the hardware store, they should be able to figure it out for you
Ha. Ha. Not in this country, they wouldn't even know what the tap is. You would likely end up with a faucet. Lol
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Old 11-30-2018, 10:30 AM   #5 (permalink)
 
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Try an industrial supply company or fastener distributor. They should have a thread gauge to determine the diameter and thread pitch, exactly. I have one from my sales days. Handy as a pocket on a tee shirt. Lowe's has one on the wall in the fastener section- if you have a store handy.
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Old 11-30-2018, 10:52 AM   #6 (permalink)
 
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Can you chase the male threads with a more comon die? I’ve done that before if you’re close.
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Old 11-30-2018, 12:55 PM   #7 (permalink)
 
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Can you chase the male threads with a more comon die? Iíve done that before if youíre close.
Hi Bruce - I was hoping that might work, but it's not close enough to anything common to make thread chasing an option. I also thought about making a jig to hold the part and machining it to 1/4-20, but that's more work than it's worth.

Ed
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Old 11-30-2018, 12:59 PM   #8 (permalink)
 
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Originally Posted by Woodchipper View Post
Try an industrial supply company or fastener distributor. They should have a thread gauge to determine the diameter and thread pitch, exactly. I have one from my sales days. Handy as a pocket on a tee shirt. Lowe's has one on the wall in the fastener section- if you have a store handy.
Hi John - I have sae and metric gauges and was able to figure out the thread pitch and diameter. It just wan't anything I had seen before.

Thanks,

Ed
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Old 11-30-2018, 01:04 PM   #9 (permalink)
 
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Originally Posted by vtgaryw View Post
It doesn't even show up on any of the standard tap charts or at McMaster. It's got to be a special.

I've wanted threaded inserts of odd sizes before too (for a semi-kitless pen project.) They don't seem to be generally available without just cannibalizing a kit. I'd love to know of a source for these oddballs too.

Gary
Hi Gary - The closest thing I could find is a 9/32-20. And it was only the tap. There was no matching die. I've got a lot of different oddball taps I've acquired over the years to use for pens. They can be crazy expensive to have made. A M7x1.4 or 9/32-18 would probably do the job. Definitely not worth having made for this project. I could also try making my own custom tap, but I'm not willing to put that much work into something I'll only use once.

Thanks,

Ed
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Old 11-30-2018, 01:08 PM   #10 (permalink)
 
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if it is some thing you could carry into the hardware store, they should be able to figure it out for you
Hi Terry - Hardware stores....not so much in this area. A neighbor works at NASA, maybe I could get him to have someone look at it.....

Ed
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