I couldn't find a thread confirming this here, so thought I'd start a new one. Which fuel bottles have which threads? I have a Coleman Apex II, and that fuel bottle has threads with an internal diameter of 28mm, and a thread pitch of 1.5mm. As it's a U.S. stove, I guess that's 1.1" I.D and 0.06" pitch. This page: http://www.adkforum.com/showthread.php?t=7492 says that MSR/Primus/Sigg use a different thread. And certainly the Sigg screwtop I have to hand (the bottle died some years ago) is 26.6mm O.D and 1.55mm pitch, so it just falls into the coleman top. Anyone know the designations for these threads? But I think I read that the Sigg drink and fuel bottles also had slightly different threads? I could really do with a new fuel bottle as mine got driven over (by the chap parking next to me - grrr) after over 20 years service (I think I bought it in 1994) and is now rather sad. I'm not sure how easy it is going to be to find such a thing as coleman stopped making these many years ago. Ebay has many brands of fuel bottle, none of which are Coleman (except plastic ones containing Coleman fuel). So it would be useful to know what, if any, other fuel bottles are compatible. If it's just Coleman, which models? Apex and Apex II. Were there more remote-bottle stoves they did?
If you don't get a satisfactory answer here... You might ask on the Coleman Collectors Forum. I just gave away 3 bottles I got at a yard sale.
I don't know the technical specifications, but Sigg, Optimus, Brunton, Primus, MSR, Snow Peak, and Kovea all use the same thread which originated with Sigg. The Sigg drink bottles have the same thread as the Sigg fuel bottles or at least the caps from either are interchangeable. I think Fire Maple uses the Sigg thread as well, but I haven't confirmed that personally. Soto uses a much wider opening for their Muka stove. Lastly, Coleman, while having about the same size opening in their bottles as the standard Sigg size, uses a different thread. I have two bottles. It'd be pricey to ship it to the UK, but if you get really stuck, I could send you my spare if you were willing to pay the shipping. It's no beauty; the paint is quite faded and looks a bit down in the mouth, but it's quite functional. I could post a photo, but try to find one on your side of the pond; it'll be much cheaper, and almost any bottle will be in better shape than mine. HJ
Hi, Please add one tiny exception to Jim's list: there was an early Sigg bottle with a metal cap (mid to late-60s vintage?) which used a different thread from all those current ones on the list. I don't recall if it was the diameter or the pitch where the threads differed, but somewhere I have an old one I kept from a damaged bottle and it doesn't fit my newer plastic capped Sigg or MSR bottles. My guess is it's not very likely one of those bottles is going to show up these days, but if anyone has use for a cap for one, please PM me and I'll see if I can find it for them. Rick C
Closest I can find anywhere near that ID is an M30 extra extra extra fine thread (1.5mm pitch) Can't find anything in imperial, 0.060" (1.5mm pitch) is the quivelant to 17tpi Guess they're specials as so often is the case in our hobby
Ah. I believe you are right. I have two of those old bottles. They were my uncle's, and they passed to me along with his 1961 Primus 71, the last of the real Primus 71's (thereafter Optimus owned the Primus liquid fuel line). I do recall trying a modern fuel bottle cap to one of the old bottles and that it didn't thread correctly. HJ
Wrong. My memory is completely off on this point. I just tried a fuel bottle cap on a drink bottle, and it didn't fit. The drink bottle mouth is narrower. Conversely, a drink bottle cap will fit within a fuel bottle mouth, but loosely. The threads are not engaged. If one turns the fuel bottle upside down, the drink bottle cap will simply fall out. Mods, if there is a way you can strike the above quote from my original post, I think that would be best. No need for misinformation. Perhaps I should report my own post? HJ
I think Sigg drink bottles are dangerous. Its only a matter of time before someone fills there 123 from the wrong bottle then takes a drink from the other bottle while lighting the stove
I bought one bottle in the white and one Red lacquered bottle, both 750mls [or 1 L?]. The red I keep for tinto vino, the Colemans goes in the plain flask. I never thought to try the caps in the other bottles. I didn't want to cross contaminate the bottles. I always assumed they were the same. Big white tape labels list the contents.
I think chinese bottles and Kovea bottles (don't sure but may be also Primus and Optimus) has thread UNF 1 1/16" - 14, 60 degree. Fire Mapple has bigger thread.
Hi Kroton Thanks for posting that I'm not doubting your measurements , just curious as to the source of thread data tables that you used. I'm having difficulty relating (and translating ) that data to the tables I have. I wonder if I can put this table through google translate somehow and get to why they mismatch Thanks again, will be interesting to get to the bottom of this Cheers
Kovea uses the standard Sigg thread. My Optimus Nova pump threads right in, and my MSR bottle works just fine with a Kovea pump. HJ
Closest I can get to those dims of 1 1/16" x 14 is a 3/4" NPT (National Pipe Thread) , It's the right TPI and close enough to the 1 1/16" measured O/D Still can't find another reference (other than Krotons table) to that O/D x pitch in UNF I'd be interested if anyone across the pond can enlighten us on this one.
I spend a lot of time to find out what is the thread. Almost everywhere in tables after 1" comes 1 1/8". Don't remember the site where I find those table, just made from there "princsreen" and closed it. For me, that 1 1/16"-14 is the closest for fuel bottle thread. If someone has more accurate information, you can share.
Hi Kroton Thanks for getting back to me on this Yep, they jump in increments of 1/8"s which was my original query, and to have a finer TPI than either of their neighbours (12 TPI) really had my head scratching Thanks again Kroton for the clarification Cheers
I have a set of "3 wires" I will attempt, today, to measure the pitch diameter of an MSR pump thread. I do not have anything Kovea so I cannot comment about that. But, if the threads are 'the same' it may help a bit. Ken in NC
I find this interesting but myself do not have method of measuring fuel bottle/cap threads. (edit: now see Ken also posting, and will try to come up w/a thread size, this is good). MSR chose c1972 *SIGG fuel bottle thread size for use with MSR 1st version yellow pump for their new, then, remote tank expedition stove. *SIGG was an established commonly used fuel bottle (the exact thread size SIGG happened to choose was of little importance, then). In my view that thread size soon became the industry standard, if there is one. Kroton you place the closest thread size to 1 1/16 - 14. Longlilly re metric "M30 extra extra extra fine thread (1.5mm pitch)" ... my thanks to you two for that. I wonder if MSR's registered patents included a pump thread size? Wouldn't SIGG have used a metric thread size? thx omc tag @Afterburner TMI I'll add, an exact thread size re caps is less certain/exact imo. That thought being: Makers of newer bottles, imo, accept that molded plastic cap threads are not a perfect match to the bottle threads (may also have rough seams from molding). They accept this w/expectation that w/regular use the new plastic will conform to the new bottle. Also that it is the O-ring, not a tight fitting thread, that is needed for the fuel-tight seal. "For caps" I myself expect makers accept slight variations with thread size / pitch (or protruding seems from mold. A lower quality standard is (today) generally accepted for caps, imo. Presence of a "V" groove (perpendicular to thread) in fuel bottle thread, imo, also supports this. This V cleans threads but is also called "self-tapping", or self threading. If maker knows many of their caps, new, are not a good fit, this V groove cuts/conforms threads of the plastic cap to better fit the bottle's thread.
