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Scuba Forum / General / December 2007Second Stage Thread Size
What is the thread size where the LP seat screws into the 2nd stage? Is it 9/16-24? Or M14x1.00? Or something else? (Not the thread where the hose screws into the 2nd stage. The thread for where what the LP hose screws onto screws into the 2nd stage.)  SignatureJohn Eells > What is the thread size where the LP seat screws into the 2nd stage? Is > it 9/16-24? Or M14x1.00? Or something else? (Not the thread where the > hose screws into the 2nd stage. The thread for where what the LP hose > screws onto screws into the 2nd stage.) What reg? >> What is the thread size where the LP seat screws into the 2nd stage? Is >> it 9/16-24? Or M14x1.00? Or something else? (Not the thread where the >> hose screws into the 2nd stage. The thread for where what the LP hose >> screws onto screws into the 2nd stage.) > > What reg? So far it appears they are all the same. The Mares, Aqualung, Sherwood, and Oceanic regs I have here all take the same thread. The threaded insert differs in detail but--thus far--not in thread sizes. Anyway, I established that it is *not* M14X1.00. So I ordered 9/16-24 today. Should have it Tuesday or Wednesday. I'm asking because I'm building some canister lights and I want them to take a standard LP hose to carry the wires between the heads and battery canisters. I've prototyped the head and think it will work but I can't pressure test it until I can screw everything together. (Both O-ring seals are axial and should seal equally well in both directions, so I'm going to pressure test it by sticking it in a bucket of water and pressurizing it via the LP hose. The normal IP is pretty close to 300' worth of pressure, which ought to do for now. ;-) SignatureJohn Eells >>> What is the thread size where the LP seat screws into the 2nd stage? Is >>> it 9/16-24? Or M14x1.00? Or something else? (Not the thread where the [quoted text clipped - 18 lines] > pressurizing it via the LP hose. The normal IP is pretty close to 300' > worth of pressure, which ought to do for now. ;-) And the answer is...9/16 x 24. I hooked up the hose and attached it to a first stage and then put the fully-assembled head under water in a bucket. The pressure test went fine--no bubbles, first try!--except that the bulb imploded partially at around 125 PSI. (It won't normally be pressurized, of course, but it had to be there to test whether there was enough preload on the outer O-ring.) SignatureJohn Eells > And the answer is...9/16 x 24. I hooked up the hose and attached it to > a first stage and then put the fully-assembled head under water in a > bucket. The pressure test went fine--no bubbles, first try!--except > that the bulb imploded partially at around 125 PSI. (It won't normally > be pressurized, of course, but it had to be there to test whether there > was enough preload on the outer O-ring.) 125/.445 = 280 FSW. .5625-24 UNEF-2A EXTERNAL THREAD The major diameter is from 0.5613 to 0.5541 The pitch diameter is from 0.5342 to 0.5302 Your wire size is 0.02900 Constant is 0.050916 Maximum flat at root is 0.01042 Minimum flat at root is 0.00521 Max. minor diameter of UN thread is 0.5162 Max. minor diameter of UNR thread is 0.5117 Measurement over wires is from 0.585116 to 0.581116 Pitch diameter tolerance for 2A is 0.0040 Allowance for class 2A is 0.0012 .5625-24 UNEF-2B INTERNAL THREAD The pitch diameter is from 0.5354 to 0.5405 The minor diameter is from 0.517 to 0.527 Pitch diameter tolerance for 2B is 0.0051 >> And the answer is...9/16 x 24. I hooked up the hose and attached it to >> a first stage and then put the fully-assembled head under water in a [quoted text clipped - 4 lines] > > 125/.445 = 280 FSW. Yeah, but the bulb imploding did not affect the seal, which held up to the IP (about 140PSI). I did say "around 300'." 133.6 PSI is the ambient pressure at 300', so at 140PSI that's actually 314'. > .5625-24 UNEF-2A EXTERNAL THREAD > The major diameter is from 0.5613 to 0.5541 [quoted text clipped - 13 lines] > The minor diameter is from 0.517 to 0.527 > Pitch diameter tolerance for 2B is 0.0051 Yep, UNEF it is, of course. But you knew that. SignatureJohn Eells > Yep, UNEF it is, of course. But you knew that. One does what one can... >>Yep, UNEF it is, of course. But you knew that. > > One does what one can... What's the E in UNEF? This side we tell it UNF 9/16x24, FI. UNF as opposed to UNC. Matthias >>> Yep, UNEF it is, of course. But you knew that. >> [quoted text clipped - 5 lines] > > Matthias Extra. SignatureJohn Eells > Extra. Yeah, then there is the unofficial designation for metric; FM f.cking Metric >>Extra. > [quoted text clipped - 3 lines] > > f.cking Metric Huh;-) Last week I was looking for 316 grommets. One company had them by a minimum order of 250, another by 1000, still another by "one gros". "you know one gros??" Hell, I did, because my grand dad in East Prussia was CEO of an agricultural cooperative. These guys were attracted, too, to these old scales and measures. Now guess were the "gros" grommets came from, and how many they were. ;-) Matthias > Huh;-) Last week I was looking for 316 grommets. > One company had them by a minimum order of 250, another by [quoted text clipped - 4 lines] > Now guess were the "gros" grommets came from, and how many > they were. ;-) As I little understand it, a gross is 12 dozen, by unit of measure of weight. Or count if you are bored... >>Huh;-) Last week I was looking for 316 grommets. >>One company had them by a minimum order of 250, another by [quoted text clipped - 9 lines] > > Or count if you are bored... Exactly, and the grommets came from the US ;-) Explains to us backward Europeens why you have this proverbial "bakers dozen". Matthias PS: will Doug be seeing you soon? > Exactly, and the grommets came from the US ;-) > Explains to us backward Europeens why you have this > proverbial "bakers dozen". Dont know, but I think we got it from you guys... > Matthias > > PS: will Doug be seeing you soon? I hope so, his book looks very interesting, I am sure he will enjoy it immensely. > Exactly, and the grommets came from the US ;-) > Explains to us backward Europeens why you have this > proverbial "bakers dozen". So, in Europe, do they sell donuts by groups of 10 or by the dozen? >>Exactly, and the grommets came from the US ;-) >>Explains to us backward Europeens why you have this >>proverbial "bakers dozen". > > So, in Europe, do they sell donuts by groups of 10 or by the dozen? They use to be something you mostly cook at home. The ready mixed flour is sold in packs of 500 g (metric), and the cast moulds come in sets of 6 and 12 (geometric) Metric rulez. Matthias > >>Yep, UNEF it is, of course. But you knew that. > > [quoted text clipped - 3 lines] > > UNF as opposed to UNC. Unified National Extra Fine. |
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