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View Full Version : Is there a 13mm thread ?



goose
12-24-2010, 06:57 PM
The issue; a threaded tube, thread unknown. May be 1/2 by 20 NF, or Metric. One clue leading to Metric is "Made in Italy" stamped on part (power washer wand) The threads don't match up perfectly to an SAE thread pitch gage, and I can't get a 1/2 * 20 die to thread on, but it may be because of gunk on the part. The tube itself measures quite a bit over 1/2", (about .514" ) but comes in at almost perfectly 13 mm diameter.

I can't find any obvious taps or dies in 13 mm size.

I'm usually an SAE type of guy, so guidance is appreciated,

Gary

philbur
12-24-2010, 07:16 PM
Google's your best friend:

http://www.metric-tools.com/catalog/item/4024227/8008998.htm

Phil:)

philbur
12-24-2010, 07:20 PM
or:

http://www.kstbrakehose.com/newEbiz1/EbizPortalFG/portal/html/ProgramShow.html?ProgramShow_ProgramID=c373e91fae1 3f96a8f6b901751ff29bc

goose
12-24-2010, 07:23 PM
$79.44 Yikes !

I might have to hand file these threads..:rolleyes:

Thanks !

Gary

sch
12-24-2010, 07:35 PM
The ever versatile fount of odd ball taps/dies www.victornet.com
has 13Mx1.25 taps and dies for less than $16 (die) and $8 for the tap. They
respond rapidly to phone orders, but still used hand written
invoices a few yrs ago They do have a minimum order. These will not be
junk dies/taps out of Bangladesh, but likely US or similar make quality.

philbur
12-24-2010, 07:44 PM
Google really is your best friend:

http://drillsandcutters.com/dwtsmh13x125hexcarbonsteel.aspx

Phil:)



$79.44 Yikes !

I might have to hand file these threads..:rolleyes:

Thanks !

Gary

jugs
12-24-2010, 07:49 PM
YES

13 x 1, or 13 x 1.5 ,or 13x1.75, or 13x2.5

taps 8 die 7

for list goto- http://www.tracytools.com/tapsanddiesmetric.htm

john
:)

goose
12-24-2010, 08:42 PM
Thanks for the sources everyone. How's 20 tpi (English) versus Metric 1.25 threading? (If this is indeed the case here.) I carefully threaded a 1/2 by 20 tap in the female component, went in about 4 turns very smoothly. I didn't force the issue.

Lathe cut threads; turn a piece of brass tubing to diameter, thread to 20 pitch ? It's for personal use, so I'm not particular. Or just use 1/2 brass tubing, a little undersized is the worry in that case.


Thanks,

Gary

oldtiffie
12-24-2010, 09:45 PM
1.25mm pitch = 0.0492" pitch = 20.32 tpi ~ 0.05" pitch = 1/0.05 = 20tpi

robert
12-24-2010, 10:24 PM
1/4 x 19 bspp straight thread or bspt tapered?

philbur
12-25-2010, 04:47 AM
Are you going all cheap on us now. Don't forget that it's a pressure fitting.

Either organise your lathe to cut metric threads or buy the correct thread die.

Phil:)


Thanks for the sources everyone. How's 20 tpi (English) versus Metric 1.25 threading? (If this is indeed the case here.) I carefully threaded a 1/2 by 20 tap in the female component, went in about 4 turns very smoothly. I didn't force the issue.

Lathe cut threads; turn a piece of brass tubing to diameter, thread to 20 pitch ? It's for personal use, so I'm not particular. Or just use 1/2 brass tubing, a little undersized is the worry in that case.


Thanks,

Gary

Spin Doctor
12-25-2010, 09:50 AM
1/4 x 19 bspp straight thread or bspt tapered?

Ran into this exact samr thing this week at work. 1/4-19 BSPP

Peter S
12-25-2010, 10:20 PM
1/4 x 19 bspp straight thread or bspt tapered?

Yes, the standard pipe thread (apart from the USA) seems the obvious first place to look for me too!

BSP basic major diameter is .518" (13.16mm). BSP has carried over into present-day pipe fittings in this part of the world, (and Europe as far as I know), though I don't have the specs in front of me at present to check if it is still 55 degrees etc.

oldtiffie
12-25-2010, 10:43 PM
1/4" - 19 - BSP thread it seems to be.

OD = 0.518" = 13.16mm

19 tpi = 0.0526" Pitch = 1.34mm pitch

http://i200.photobucket.com/albums/aa294/oldtiffie/Black_book/Black_book2_P26-27_1.jpg

goose
12-25-2010, 11:11 PM
I was wondering originally if it was a sample of non USA pipe threads.

It appears not the case with BSP. I'm getting about .512" to .515" range outside measure. The thread depth is not as deep, hard to measure, maybe .473". The pipe/tube appears to be chrome plated steel with spotty corrosion, so hard to measure precisely. The threading looks like regular 60 degree V shaped. There is no apparent taper to the threaded portion and there is no sealant as far as I can tell, (don't know if sealant would be used in any case.)


I've got some brass tube to mess around with and try making a replacement sometime this week. I figure brass would be an improvement, don't know why they'd use steel in the first place, the inside is rusted and the outside plating is about 50% gone. The entire tube slides in a protective plastic housing. The other fittings are brass.


Gary