Are the threads on a sigg fuel bottle the same as on a sigg aluminum drinking bottle? Trying to get verification that a .3 L water bottle will work on a stove. Thanks, Mark
Hi Mark, I used to work for the NZ Sigg importers. I wouldn't use a drink bottle for a pressure stove, or to carry your fuel supply. The swing tags state that. The drink bottles have a plastic coating that may degrade with fuel. This could then lead to blockages. The gaskets on the tops are also made of a different material. Also, I'm not sure that the wall thickness would be the same. Sigg manufactures to fine tolerances, and a drink bottle is just that, don't use it as a pressure tank. I may be wrong, but I wouldn't take the risk myself. Not to say you're doing the wrong thing Rik, at some stage Sigg started making a separate line for drinks. Yours may be prior to that, or dedicated fuel bottles. I have seen split fuel bottles coming in for warranty claims before tho: "Why shouldn't they be left in the sun?" If it is for a pressure stove, would a .3l bottle be long enough for the pump? FYI, Sigg makes the fuel bottles for Primus, and perhaps Optimus. As I understand it, that was one of the reasons they stopped makling the Firejet stove, to retain one of those contracts. And I think that Sigg fuel bottles are cheaper than their drink bottles. The threads for MSR, Primus and Sigg are the same, I have never compared with an Optimus. Also, I have found a supply of Firejet spares in Auckland for reasonable prices. If anyone needs something, let me know via PM. Cheers, Tom
Great information Tom. I may need some firejet spares so I'll keep you in mind. I recently picked up an old pale blue sigg bottle with the metal top versus the plastic top. This would date back to the early 1970's or before. I'm guessing these older ones are essentially all the same and can be used for fuel as well as beverages. Have you seen these? http://www.swissbottle.com/bin/category.asp?category=36 Got to get one before the year is out.
GASKET?? i was about to buy a few packs of these untill i saw the shipping --$6--was the same price as the 2 pack of gaskets-- any ideas?? REI--Alan,how about Midwest or the Thrifty Outfitter?? see any there??
Dave, I was at midwest today and they have a lot of Sigg items in the store so they may well have some gaskets. Otherwise, try REI's website. Have the item shipped to the store and pick it up when it arrives - they send out an email upon arrival. No shipping charge by doing this. I do this all the time, especially if a sale is about to end and I can't get to the store before it's over. The same deal applies to REI's web outlet. Thrifty may also have some, they have a bunch of that junk laying around. By the way, thrifty has reflective tent guyline cord for $0.10/foot. It's not as light as Kelty spectra stuff, but it is 1/3 the cost. They are in the process of remodeling the upstairs area so they have stuff scattered everywhere. Some place like Harris Warehouse may have sigg gaskets laying around as well.
Dave, I was back at Midwest today. No gaskets available, but they sell replacement tops, which have the gasket internally, for about $6.
Yes, here's the web link. http://www.midwestmtn.com/ Thrifty outfitters is a part of the stove on the second floor. Thrifty is a great place to shop, they have overstocks, closeouts, a great selection of stuff - webbing, cord, plastic hardware, tent pole spares, as well as a good repair department. It's the sort of place where you can look forever as there is a ton of stuff packed into the place. The store also features a wonderfully irreverant sense of humor.
As far as I have been able to identify the screw thrads on th bottles, moast quality bottles as Sigg use a thread: 3/4" WPIPE (dia26.988mm) 14 t.p.i I belive som of those even not know the std. but just makes it equal to sigg. These threads will at least fit: Sigg, Optimus, Primus and Trangia and is used on both drinking and fuel bottles. dsk
It appears to be 14 threads per inch, but it is of a different diameter than 3/4 inch NPT in the U.S. A real SIGG cap won't fit into a female 3/4 NPT fitting at all and a male 3/4 NPT fitting goes into a SIGG bottle very loosely, requiring almost the entire taper to be used up before it even begins to get snug. I don't notice any tendency to bind, so I think it is a true 14 t.p.i. pitch. It could be BSP (British Standard Pipe) thread, which has a different thread profile (55° Whitworth for BSP vs. 60° Sellers for NPT), but I don't have access to any sample BSP parts at present to test this out. Water pipe threads, whether U.S. or British standard, are always tapered. The threads on SIGG caps have no taper. They may be a pipe thread of some kind, but NPT they are definitely not. I took my late-1970s genuine SIGG cap to a local department store and test fitted it to a current-generation SIGG beverage bottle. The fit was perfect, the same as on my SIGG fuel bottle, so that answers the question of SIGG beverage bottle and fuel bottle thread compatibility.
When the gasket on one my Sigg bottles wears out, I just use an MSR "O" ring to replace the gasket. Works fine. I use my old Siggs for kero and MSR for petrol (Coleman fuel). HJ
I took my late-1970s genuine SIGG cap to a local department store recently and test fitted it to a current-generation SIGG beverage bottle. The fit was perfect, the same as on my SIGG fuel bottle, so that answers the question of SIGG beverage bottle and fuel bottle thread compatibility. The SIGG beverage bottle also appears to have integral machined threads in the neck, not a threaded insert, just like the fuel bottles of 30+ years ago. I wouldn't try using a SIGG beverage bottle with any kind of stove fuel without running some tests first, though, Mark. As stated by DonTom earlier, the current-generation SIGG beverage bottles have a proprietary plastic lining that could slough off or dissolve in the presence of various liquid fuels and cause havoc in a stove or lantern. The best thing would be to find a solvent (acetone, ketone, MEK, what-have-you) that quickly and completely removes the plastic, leaving a bare aluminum interior, before attempting to use a SIGG beverage bottle for fuel transport and storage. If you try washing out the liner with a solvent, it would be best to not use the original bottle cap, not even one rated for fuel use, as anything aggressive enough to destroy the liner would probably do the same to the cap. There's an interesting discussion at the Practical Machinist forum (September 2008) discussing the thread identification for SIGG fuel bottles. It's not clear if the participants came to any conclusions whether it's a standard or proprietary thread, but they threw some numbers around that give a better idea of the actual thread dimensions.
