M13 x 1.25 thread obsolete?

[cross hair]

I have been developing a new product line and a M13 x 1.25 thread suits the assembly components perfectly. I easily found some taps but had trouble finding a threading die to use to build my protos. One of my tooling vendors told me the M13 x 1.25 thread was obsolete, is that true? Or is it just a little used thread? 1 pitch is a bit finer than I want to use and 1.5 is to coarse. I am in the US but have to use metric threads for these parts do to over seas sales, so I am wondering if you folks across the ocean are using M13 x 1.25 or if that size indeed is disappearing.

Thanks

 

[Limy Sami]

IME, anything 13mm is a real oddball,........ and only <> 0.012'' larger than 1/2'' ??

FWIW 1.25 pitch is <> 22TPI, - my advice would be ;- if you can live with it on the PT, stick to 1/2'' unf OR a more easily available imperial dia / pitch.

FYI - useful easily available special sizes here - Victor Machinery - Metalworking tools and supplies

Oh yeah - Proprietry threads do not have to be metric for export

 

[NAST555]

In all honesty M13 of any style pitch is not really a standard unless i have been looking at the wrong charts for years. Sure, M13 is around but it is only for really specialised components where the manufacturers want you to buy from them when you need spares because they are not off the shelf type of things.

I know that you said that M13 would work perfectly but cant you try to change it to M12 or even M14? that way you will easily find M12x1.25 or M14x1.25

 

[Bobw]

If you are going to use an obsolete metric thread anyways, how about specing a M12.7 x 1.27 ? At least you can get those.

M13 seems to be an oddball, regardless of pitch.

 

[michiganbuck]

Ebay has 13 x.75, 13x1.o, 13x 1.25 and 13 x 1.5 dies and taps

HSS die
http://www.drillsandsupplies.com/shop/m13x1-25-1-12od-hs-special-round-die/

HSS die
http://www.hermanscentral.com/product/qual-tech-13-x-125-x-112-round-adjustable-die-hss-3353.cfm

looks like Ebay dies are China made and perhaps carbon steel
http://www.amazon.com/13x1-25-Metric-Right-thread-M13x1-25mm/dp/B00IR590PQ

but some charts dont have M-13 listed
http://www.engineeringtoolbox.com/metric-threads-d_777.html

https://www.carbidedepot.com/formulas-tap-metric.htm

You should ask Gordon B Clark

If you are going to make all the components of your product might be fine to make it odd.

 

[Clive603]

These days BSP (British Standard Pipe) is an official metric pipe thread standard so why not use 1/4" BSPP 0.518 Ø and 19 TPI translates to 13.16 mm Ø by 1.34 pitch. Pretty close.

There is a long an honourable engineering tradition of using BSPP threads as extra fine when BSW and BSF won't do. Smaller nuts too.

Clive

 

[sable]

M13 is not obsolete it is /was a non preferred thread ,if you want fasteners to be easily available for your product go with something else ,if it is more important to have a thread that is just the right spec for your design a non preferred thread is fine (as long as you can get hold of the bolts etc that you need).

 

[Gary E]

this a consumer item ? use the cheapest bolts you can find,
it wont matter and every penny saved from the cost of the item is moved into the PROFIT column.

a military item?..... make it a special thread... YOU MUST COME BACK to the MFG for spares... : )

 

[dian]

do M13 screws really exist? just looked through 3 pages of google and no trace of them.

 

[WizardOfBoz]

do M13 screws really exist? just looked through 3 pages of google and no trace of them.

Over here, you can get them by the handful at Home Depot (hardward/home improvement store). Same aisle as unicorns.

 

[rabidchimp]

I've never run into anything M13, other than this thread (no pun intended). You say you found a tap, cool, why not single point the male thread? Just curious.
-Aaron

 

[cross hair]

One of the hiccups is I am trying to work around is 1/2" diameter stock, that is the base material size we use for much of our product. If I go with a 12mm thd. then I need to turn the stock diameter which I don't want to do, that causes other complications. The 1/2" stock is a tad undersize for a 13mm thread but seems to work out well for the parts I have built.

I did try a 1/4 BSP but using 1/2" diameter base stock left me with loose connections that I wasn't happy with. And Bobw is M12.7 x 1.27 a real thread? Or were you just being cute describing a 1/2-20 in metric terms? I looked but found no info on such a thread.

Given a choice I would use 1/2"-20, that is the perfect thread for the parts, but we are working with some global marketing companies and they insist everything for export needs to be metric. According to them there are plants where it's not allowed to have anything but metric tooling and hardware, hard for me to believe but I guess in this age of global standardization maybe that's what it's coming to.

These parts are all components we will build in house, yes we will be single pointing the male threads but would like to use a tap on the female threads, as far as production runs. We also do a lot of custom work and it would be nice to have taps and dies to use on the engine lathes instead of having to single point threads.

 

[michiganbuck]

looks like they are pricing the 13 x 1.25 SS die as a special but dont know how many you production run will need.. Turning the OD would cost per part Would the customer and the part be Ok with -.012 or so?
Not uncommon to find an OD a little on the minus side these days.

 

[jCandlish]

do M13 screws really exist? just looked through 3 pages of google and no trace of them.

I've got an old Craftsman 'metric' tap-n-die set that includes M11x1.5.

.

 

[Limy Sami]

I've got an old Craftsman 'metric' tap-n-die set that includes M11x1.5.

.

Quite a common size in the European automotive industries, ............mainly I suspect, because between 10 & 12mm there's nothing as a ''replacement'' for 7/16''.

 

[billmac]

... they insist everything for export needs to be metric. According to them there are plants where it's not allowed to have anything but metric tooling and hardware, hard for me to believe but I guess in this age of global standardization maybe that's what it's coming to.

Those customers are going to be very unhappy if they find a M13 X1.25 thread. Just because the thread is specified in millmetres does not mean that it is acceptable for plants that adhere strictly to metric standards. As others have said there are no standard M13 X anything threads. Unless you have an absolutely rock solid functional reason to stray from the standard M series threads you should not, and whilst wanting to use your 1/2 stock is understandable, it isn't a good enough reason to to use this thread size.

 

[Limy Sami]

Easy peasy, use 1/2'' x 20 (which you state as the ideal thread), mark the drawings M12.7 x 1.27, and the jobs a goodun

FWIW I've had ''decent'' drawings marked ''Ream 8mm +0.00 -0.07'' - you do the maths and work it out

 

[juergenwt]

Your company because of overseas sales requires metric design. M13 x 1 is a third choice metric fine thread. M13 x 1.25 is out.
My advise to your company: time to change to metric completely and discontinue the 1/2" stock. Go to 12mm bar stock and use M12.
Sooner or later you will need to change your product to be fully metric and not half and half. With 1/2 inch bars you will be in export trouble sooner or later. Chances are there are many other components of your product still in inch and that mixture spells trouble.

 

[EPAIII]

I found an M13 x 1 die on the first page of a search.

Amazon.com: 13mm X 1 Metric Right Hand Thread Die M13 X 1.0mm Pitch: Home Improvement

And an M13 x 1.25 on the second page:

Qualtech m13 X 1.25 Carbon Steel Hex Die, Special DWTSMH13X1.25: Tools : Walmart.com

Wal-Mart of all people!!!

Here's another one, cheaper than WalMart:

http://www.mutualscrew.com/product/...sar8nscrrKolLQzw0xHpxeCbozh-wwlx3oRoCYdXw_wcB


But unless you really have some critical requirement for that thread, I would consider using a more standard thread.

 

[PDW]

Those customers are going to be very unhappy if they find a M13 X1.25 thread. Just because the thread is specified in millmetres does not mean that it is acceptable for plants that adhere strictly to metric standards. As others have said there are no standard M13 X anything threads. Unless you have an absolutely rock solid functional reason to stray from the standard M series threads you should not, and whilst wanting to use your 1/2 stock is understandable, it isn't a good enough reason to to use this thread size.

+1. If you sent me anything with a M13 thread of *any* pitch, I'd be really, really unhappy as soon as I found it. Doing that is just plain stupid - unless you *want* your customers to think that you're the sort of arsehole who tries to hold them to ransom for unobtanium parts.

Buy 12mm bar and get over it. How hard can that be?

PDW