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Thread: Taping a hole metric / whit
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3rd Oct 2021, 10:26 PM #16Diamond Member
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This is a strange mix of thread standards if this is a metric tap set. It has several coarse thread taps' heap of metric fine thread taps and at least one metric special. If a buyer bought these for general common use then I think that they would be disappointed with the range included. Metric fine threads are generally rare let alone a metric special, and with only three coarse taps That I could see, it doesn't appear that useful. Perhaps there were many more out of frame in the picture.
Thanks Chris for your tapping chart, it looks well organised and pretty useful, and here is a link to a ready reckoner of threading info, which I have posted here in times past. I will put it in again for people who may not have seen it earlier.
Tap drill size calculators
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4th Oct 2021, 12:29 AM #17Senior Member
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Baron you can take the pointy hat off and come out of the corner. Everyone makes a little goof now and then. Be happy you weren't doing old style book keeping and went to the wrong column while doing your taxes.
Can't say how it is for you gents but here many machine tooling suppliers give tap drill charts to their customers, both pocket and wall chart sized. If you have access to one ask them and they may very well give you one. Some are cardboard and some are plastic making them very handy to hang on the wall. There are others with fastener, metal, pipe and tube information. It's out there for the asking and the worst thing that can happen is they say no.
Putting multiple tap and die sizes on the same box with one or the other is the epitome if cheap. I think I would be looking for better.
Pete
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4th Oct 2021, 03:36 PM #18Member
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BSP is very common for plumbing fittings in Australia.
I think the tap you are looking for is 1/4" BSP (19 TPI).
These taps come in 2 different thread styles - either a taper thread or parallel. Both are 19 TPI.
regards,
Paul
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4th Oct 2021, 03:57 PM #19
If I understand correctly what you are saying you are having a bad time of it understanding the differences between the two BASIC thread systems.
Imperial based up feet and inches has references to pitch measuring against the imperial system -TPI -Threads per INCH .
So 1/2 x 20 refers to 1/2 inch diameter by 20 TPI -Threads per inch.The Sutton chart says it is Unf 20 TPI equates to 7/16" AND 1/2"
So I am positive that you need a NF /UNF 1/2" by 20 TPI tap
If converted into Metric that would be 12.7 x 1.27 pitch ( there's no such tap size) and that's no where near 14mm x 2.0 mm unless my maths have gone bad.
The thing is to remember for METRIC that you discount thoughts of TPI for metric and use the term pitch -that's distance between EACH thread crown point.
Yeah,I know there's also angular differences 55 degrees imperial and 60 degrees of the thread points but can't suggest how a home diyer hobbyist might pick them.
To avoid any more confusion for you,with the case packaging , could I simply suggest labeling the sockets for each tap tool /die if they are surfaces are legible.
I used a white paint marker and fine indelible marker both from the newsagent.
If not too illegible ,use the markings actually marked on the tap or die.
I tried engraving shanks of the taps and dies but most were too hard to leave a legible mark. You might spray that in some sealer as oil degrades the ink marker writing.
Grahame
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4th Oct 2021, 11:55 PM #20
Hi Guys,
You could always "Electro Pen" etch the size on the shank !Best Regards:
Baron J.
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5th Oct 2021, 06:45 AM #21Most Valued Member
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5th Oct 2021, 08:48 AM #22Senior Member
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I've been tapping holes for over 60 years & thought I knew most threads so could someone please tell me what the hell a metric special is?
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5th Oct 2021, 09:44 AM #23Senior Member
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Comes with fries and a big soft drink!
Pete
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5th Oct 2021, 11:08 AM #24Senior Member
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Snapey, its anything that the supplier doesn't carry as a line item and can then charge an arm / leg for but the Engineers Black Book lists a heap of Metric Special Pitches. Alan
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5th Oct 2021, 11:44 AM #25Member: Blue and white apron brigade
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At the risk of repeating what has already been said several times, but perhaps to further clarify, the picture posted by the OP is just part of a generic T&D case used by Hare and Forbes.
Screen Shot 2021-10-05 at 8.29.06 am.png
The same case is used for imperial sets as metric sets.
Imperial set: https://www.machineryhouse.com.au/T015
Metric Set: https://www.machineryhouse.com.au/T014
The Imperial set includes both UNC and UNF T&Ds and the metric set also includes regular and fines.
After a while you can tell what is what just by looking at the taps.
I have both of these sets and the items are all fairly well marked so there is no confusion.
I find I'm using the metric fines much more than I though I would, mainly when threading into thin (<3mm) sheet.
The table top for my thin kerf abrasive table saw is made of 2mm stainless held together with M4 and M6 fine CS socket screws
guard2.jpg
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5th Oct 2021, 03:20 PM #26
What I replied to, was in davewoks post 1 and that was before he got to talking about plumbing.
Its only in post 14 does davewok get to referencing plumbing.
We are forced to make assumptions which may be incorrect about what davewok might know and what he does not know about taps and dies.
New members and infrequent posters have this problem with many posters who often don't supply enough information/ details to obtain the answer they seek .
davewok wants to drill and tap a hole in something to fit a nozzle.
What sort of nozzle? Do we assume garden hose nozzle. Could it be some other sort of nozzle.? Fuel pump nozzle on a farm ,maybe?
I would assume that because normally there's any amount of easy available fittings from bunnings or the like stores, it is not a project to fit a hose nozzle to a reticulated household system.
Please davewok give us more elements of your project. Truly it shall make a whole lot easier to help you.
Ie : I would like to drill and tap a hole in a xxxxxxxxxxx to take a standard 1/2' BSP hose nozzle. It is to fit to an oil storage tank ???
Is 1/2"BSP the right tap thread to use?
With a little bit more information we can get the difficulties sorted out.
Grahame
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5th Oct 2021, 04:25 PM #27Most Valued Member
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5th Oct 2021, 10:05 PM #28Diamond Member
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5th Oct 2021, 10:19 PM #29Senior Member
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6th Oct 2021, 06:48 AM #30Most Valued Member
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