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 donn
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| posted on July 5th, 2014 at 05:28 PM |
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Bolt identification? NOT VW
I'm trying to identify a bolt size / thread, not out of a VW and unlikely to be metric as it's to fit a tread in an old machine manufactured in
Scotland, I have a bolt that fits reasonably well and have measured the pitch with a screw pitch gauge ..(28) and the OD of the thread
is 5.4 mm, pretty sure that's exact OR .2126 inches (by my conversion calcs.) Using some identification charts I found (Google is my friend) the
nearest I can come up with (though not exact) is an American (?) UNF, although it's unlikely I would think as it's an English or at least Scottish
machine, I have a 1/4 Whitworth die (at least it has 1/4 W20 stamped on the body of the die) and that wont fit, too tight and an NF28 die and
that's no good either, too loose.
Does anybody out there in help-full land have a clue to help.
The only place I can see where I may be off track is that while the bolt I have, I don't have a nut to fit, does run into the threaded part all the
way to the bottom (15 mm) I can't be sure that it is a really good fit, feels OK but I'm not positive
Thanks in advance
Don
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mackaymanx
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| posted on July 5th, 2014 at 05:54 PM |
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I would suggest B.S.F British Standard Fine but the pitch would need to be 26 tpi for that O.D.
edit rechecked my tables and it could be 7/32 B.S.F which is 28 tpi with an od of 5.55mm
Quote of the week
"Do I wish to send them to you again, nope, no interest can't be bothered really, to much hassle for little or no return."
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HappyDaze
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| posted on July 5th, 2014 at 06:07 PM |
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Have a look here, donn :-
http://www.tracytools.com/taps-and-dies
I had a similar problem with my Minerva. There was a thread I had not heard of called UNS.....1/4 UNF is 28 TPI, 1/4 UNC is 20 tpi - 1/4 UNS is 24 TPI
!
If you need 1/4 UNS taps & die, you can borrow mine. Good luck.
I'd rather wear a Beetle out by racing it than by polishing it!
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psimitar
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| posted on July 5th, 2014 at 08:36 PM |
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| Quote: | Originally
posted by HappyDaze
Have a look here, donn :-
http://www.tracytools.com/taps-and-dies
I had a similar problem with my Minerva. There was a thread I had not heard of called UNS.....1/4 UNF is 28 TPI, 1/4 UNC is 20 tpi - 1/4 UNS is 24 TPI
!
If you need 1/4 UNS taps & die, you can borrow mine. Good luck.
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Just out of interest. I know the F=fine and the C=coarse for UN sizes but any idea what the S stands for?
madness is in the eye of the beholder |
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HappyDaze
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| posted on July 5th, 2014 at 08:59 PM |
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"Special", I think.....it was a new one for me.
I think Harley Davidson used UNS threads.
I'd rather wear a Beetle out by racing it than by polishing it!
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donn
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| posted on July 6th, 2014 at 06:54 AM |
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Ok, thanks for that fellas, I'll head off to the bolt suppliers armed with that info on Monday, Saturday just before closing I took a punt but came
home with the wrong gear. 
I dream of a day when a chicken can cross a road without being asked for it's motive!
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HappyDaze
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| posted on July 6th, 2014 at 07:52 AM |
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7/32 BSF looks like it.......however [just to confuse the issue], there is a metric 5.5x0.9 thread which is VERY close.
BSF thread angle is 55 degrees, Metric is 60 degrees. 
I'd rather wear a Beetle out by racing it than by polishing it!
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donn
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| posted on July 7th, 2014 at 12:50 PM |
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We'll the good news is that it sure looks like 7/32 BSF, the bad news that it's no longer made or not available, depending on who you ask, so I've
got the job of drilling and tapping a new thread.
Thanks for the help 
I dream of a day when a chicken can cross a road without being asked for it's motive!
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modnrod
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| posted on July 7th, 2014 at 02:27 PM |
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Hhmmmm.
I had our local WA bolt and fastener companies all tell me I couldn't get metric fine M18 (common in Euro). They also told me that you could no
longer get SAE 10/32 or 8/32 (I use them here at work on old NASA shite).
What that translates too is they either haven't even heard of them and are too bloody lazy to look, or they haven't got suppliers who stock them.
I found them on Ebay no worries.
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donn
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| posted on July 7th, 2014 at 03:56 PM |
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Well Modnrod, I'm not even going to look, I've already tapped the new thread and I don't want to find out that I didn't look hard enough. 
I dream of a day when a chicken can cross a road without being asked for it's motive!
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1500S
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| posted on July 10th, 2014 at 10:18 AM |
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| Quote: | Originally
posted by modnrod
Hhmmmm.
I had our local WA bolt and fastener companies all tell me I couldn't get metric fine M18 (common in Euro). They also told me that you could no
longer get SAE 10/32 or 8/32 (I use them here at work on old NASA shite).
What that translates too is they either haven't even heard of them and are too bloody lazy to look, or they haven't got suppliers who stock them.
I found them on Ebay no worries.
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Maybe we shouldn't use the term S.A.E as it confuses those who don't know that it is replaced by Unified National Fine and has been
for a long time. If the counter jockey looked up the SAE chart and couldn't find a #8-32 thread on it he was correct as it is a UNC
thread................... but we all know that!
A good reference is http://mdmetric.com/tech/tict.htm as it has all the
common threads we need to know, old and new. The old DIN (the Japs used them for their old JIS as well) is useful to know as well for old machinery
from Japan and Europe. Some pitches and diameters differ in the small sizes.
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modnrod
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| posted on July 10th, 2014 at 12:01 PM |
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| Quote: | Originally
posted by donn
Well Modnrod, I'm not even going to look, I've already tapped the new thread and I don't want to find out that I didn't look hard enough.
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Jobs done then!
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Yellowbug65
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| posted on July 10th, 2014 at 06:16 PM |
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For future reference a copy of machinerys handbook has every thread ever produced and you can pick up a copy off amazon fairly cheap , you don't need
the latest so an older version is fairly cheap and it has a lot more useful information than just thread types
Cheers
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pod
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| posted on July 10th, 2014 at 07:24 PM |
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sure its not a BA thread as in 0BA 1BA etc
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