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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Stainless barbed insert adapter sizing??
Hi,
Sorry this is sort-of off-topic, but people here know everything... I'm looking for stainless steel barbed insert fittings to adapt "3/4 inch" black poly pipe to 3/4 male NPT threads. There used to be several local sources, but now none of them seem to remember they ever came in stainless. I tried McMaster's 5363K72 adapter, which came marked "HASS-3 A04 USA", but ran into the pipe size issue. That adapter is 0.777" across the barbs, which sounds appropriate to force-fit into 3/4 pipe, except that common "3/4 poly" pipe around here is 0.824" I.D. so the adapter doesn't even come close to fitting snugly. It seems a random half of the insert fittings I see follow this sizing, while the other random half are around 0.850" across the barbs and fit nicely into 0.824" I.D. pipe. Sizing doesn't seem to depend on whether they are plastic, steel, brass, or stainless, or whether they come from hardware store, farm supply, or irrigation dealer. I've been Googling for a long time now, and have found no explanation of how to deal with this - and not a single listing of adapters with diameters given! Is there any way to buy a "3/4" barb adapter and guarantee that it will fit "3/4" poly pipe as opposed to pipe that is actually 3/4" I.D.? Anyone know of an online catalog that actually lists barb diameters of the insert fittings? In stainless? Loren |
#2
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If you have a lathe and a source of SS, seems like a perfect project!
Paul |
#3
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You are hitting the "tube" versus "pipe" problem. Tube and hose has even
inside diameters. Pipe is measured in a "nominal" inside diameter. The poly pipe is just that, measured in "pipe" sizes. I looked at some catalogs, didn't do very well finding anything. Loren Amelang wrote: Hi, Sorry this is sort-of off-topic, but people here know everything... I'm looking for stainless steel barbed insert fittings to adapt "3/4 inch" black poly pipe to 3/4 male NPT threads. There used to be several local sources, but now none of them seem to remember they ever came in stainless. I tried McMaster's 5363K72 adapter, which came marked "HASS-3 A04 USA", but ran into the pipe size issue. That adapter is 0.777" across the barbs, which sounds appropriate to force-fit into 3/4 pipe, except that common "3/4 poly" pipe around here is 0.824" I.D. so the adapter doesn't even come close to fitting snugly. It seems a random half of the insert fittings I see follow this sizing, while the other random half are around 0.850" across the barbs and fit nicely into 0.824" I.D. pipe. Sizing doesn't seem to depend on whether they are plastic, steel, brass, or stainless, or whether they come from hardware store, farm supply, or irrigation dealer. I've been Googling for a long time now, and have found no explanation of how to deal with this - and not a single listing of adapters with diameters given! Is there any way to buy a "3/4" barb adapter and guarantee that it will fit "3/4" poly pipe as opposed to pipe that is actually 3/4" I.D.? Anyone know of an online catalog that actually lists barb diameters of the insert fittings? In stainless? Loren |
#4
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You might try Cole-Parmer or Grainger.
"Loren Amelang" wrote in message ... Hi, Sorry this is sort-of off-topic, but people here know everything... I'm looking for stainless steel barbed insert fittings to adapt "3/4 inch" black poly pipe to 3/4 male NPT threads. There used to be several local sources, but now none of them seem to remember they ever came in stainless. I tried McMaster's 5363K72 adapter, which came marked "HASS-3 A04 USA", but ran into the pipe size issue. That adapter is 0.777" across the barbs, which sounds appropriate to force-fit into 3/4 pipe, except that common "3/4 poly" pipe around here is 0.824" I.D. so the adapter doesn't even come close to fitting snugly. It seems a random half of the insert fittings I see follow this sizing, while the other random half are around 0.850" across the barbs and fit nicely into 0.824" I.D. pipe. Sizing doesn't seem to depend on whether they are plastic, steel, brass, or stainless, or whether they come from hardware store, farm supply, or irrigation dealer. I've been Googling for a long time now, and have found no explanation of how to deal with this - and not a single listing of adapters with diameters given! Is there any way to buy a "3/4" barb adapter and guarantee that it will fit "3/4" poly pipe as opposed to pipe that is actually 3/4" I.D.? Anyone know of an online catalog that actually lists barb diameters of the insert fittings? In stainless? Loren |
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