Unusual tap n die sets

[skipskip]

I have stopped buying sets because no one wants them, but these two caught my eye.

First is a  number 99 "bicycle set" from Butterfield co in Vermont.

Instead of dies it has screw plates

and odd sizes too

5/16 -18, 22, 24, 26, 28, 32

1/4 24, 32

1/2  20lh, 1/2 24 lh

1/2 24, 20


The second one is even stranger to me.

Gas fixture set number N  from JW carpenter

and all the threads are fine, and NOT tapered

1" - 27
7/8 - 27
3/4 - 27
5/8 - 27
1/2 -  27


any opinions? info?

jan011 by Skip Albright, on Flickr

jan012 by Skip Albright, on Flickr

jan024 by Skip Albright, on Flickr

jan025 by Skip Albright, on Flickr

[amecks]

Never seen either of those before.  The gas set I would pass on,  but I don't think I could have walked away from the bicycle set. 
Some of the threads per inch match British Whitworth and British Standard Fine, and also British Standard Cycle Thread.  But some do not match any of those.
I like the bicycle set - the same tool will hold the dies or the taps - nice!

[Yadda]

At the right price I would have bought both.

[skipskip]

Price was right, and they will move along once I figure out who needs them more than me

[p_toad]

i am not totally surprised by that second set...although the sizes and thread counts are weird...

i'm somewhat interested in old lamps and parts and those are typically made with NPS fittings (national pipe straight); i.e., untapered

1/16 - 27
1/8-27
1/4-18
3/8-18
1/2-14
3/4-14
etc., etc.   very much like old un-tapered gas pipe connections....

so, as to why they would all be -27 ???   i seem to recall some faucet aerators being 15/16"-27 for standard-sized male and 55/64"-27 for standard-sized female threads

[humber2]

BSB is British Standard Brass when it comes to threads. The common factor is that all sizes are 26 TPI.

The set shown above appears to be an American version with 27 TPI.

I suspect the thread angle will be 60^ Whereas BSB is 55^ to Whitworth form.

Definitely a specialised set.

[bonneyman]

Those sets are quite unusual. I, too, would have snagged the bicycle set just to have it.

[lptools]

The pair on the far right in the bicycle set, is that the tap holding dies? Thanks, Lou

[skipskip]

I found UNS United Special thread seems to fit these sizes.

doesnt help much

[skipskip]

Good eye Lou

those seem to be for holding the  taps

[JoeCB]

The 27 TPI seems to be associated with US tube and pipe fittings. I just encountered a 3/8 -27 flair coupling nut on a common Coleman gas lantern. The flair nut that secures the generator tube. We were making a special adaptor to use a Coleman generator on an obsolete other brand lantern. I had to buy a special 3/8 -27 die to make the adaptor. Now we are investigating whether this 1/4 " tube X  3/8 - 27 thread flair nut is a Coleman special or some more readily available special brass tube fitting.
Tubing fittings just drive me nutZ

Joe B 

[lptools]

Hello, Skip. Thanks! Looks like you may be missing half of a die set? What size?