Is there a list somewhere that shows the various thread sizes one might run into with quick connect fittings, tank valves and fill stations etc. for PCP guns?
If there isn't, maybe this could be one. I will start it out with mainly just the QD connectors and a list of most thread types out there. Be sure to verify any threads on parts you are working with, since using connectors with a close but not exact thread size can be very dangerous and even fatal.
From this web page
QC HPA / PCP Connector and Whip Thread Sizes I have Found for sale on Amazon
From this page - For some additional info, here are the main thread types found in pipe fittings used with water, hydraulics and HPA. Apparently Metric stuff is another thing altogether.
MIP, NIP, and FIP work together, but are not compatible with any other types. Let’s begin by taking a look at various common pipe thread types:
NPT or NPS: This is the national pipe tapered or straight. It is most common in North America.
MIP or FIP: This is the Male or Female Iron Pipe. They have the same thread dimensions as National Pipe Thread (NPT).
BSP (T) or BSP (S): This stands for Standard pipe tapered or straight. It is most common in Europe.
NPT and NPT Fitting
NPT basically stands for National Pipe Taper, which is a term defined by American National Standards Institute (ANSI).
It is used to describe residential-grade pipe systems.
This type of thread fitting can be used with FNPT or rather female NPT fitting in residential water as well as hydraulic systems.
It turns out that I only have 2 different thread sizes on all the quick connectors and micro bore hoses I have on hand.
If you try to thread two different thread count parts together, they of course will act like they are going to fit fine, but they jam up eventually if the thread junction is long enough. If you force them together, you can probably get a good seal but you are going to damage the threads on one or both of the parts. Jamming a steel connector into a brass one will probably just damage the brass one. Something to consider if you are in a pinch and don't mind sacrificing the brass part.
As for the male quick connect parts on guns and hoses, as discussed quite a bit on AGN, there is no standard. You can make oversized male QC parts smaller by turning them down or polishing with wet dry sandpaper in a lathe, but you can't make them larger without spending a LOT of money on a $6 part.
If I get bored enough, I might add more information for the following. Feel free to post a link that shows all this stuff or give the specs and I will add them to this first post in the thread.
Tank and Fill Station Threads
Threaded Tank Opening Specs
If there isn't, maybe this could be one. I will start it out with mainly just the QD connectors and a list of most thread types out there. Be sure to verify any threads on parts you are working with, since using connectors with a close but not exact thread size can be very dangerous and even fatal.
From this web page
Six Most Common Types of Threads (Not just those found on HPA / PCP fittings.)
When it comes to different thread types, most people who work in the fluid-power industry will recognize American pipe threads (NPT/NPTF) as well as SAE or Unified threads (UN/UNF). However, threads and connections are divided into six main types:
When it comes to different thread types, most people who work in the fluid-power industry will recognize American pipe threads (NPT/NPTF) as well as SAE or Unified threads (UN/UNF). However, threads and connections are divided into six main types:
- UN/UNF
- NPT/NPTF
- BSPP (BSP, parallel)
- BSPT (BSP, tapered)
- metric parallel
- metric tapered
QC HPA / PCP Connector and Whip Thread Sizes I have Found for sale on Amazon
- 1/8" UNF usually incorrectly labeled or even made with NPT threads* (National Pipe Thread) - The specs I found say 27 TPI, but I got 25 Threads Per Inch measured with my 40 year old gauge.
- 1/8" BSPP BSPP (British Standard Pipe Parallel) - ?? Threads / Inch
- M10x1 - 28 Threads Per Inch measured with my gauge / I think these are normally measured in threads per millimeter?
- Have you encountered anything else out there on PCP QC fittings and hoses?
From this page - For some additional info, here are the main thread types found in pipe fittings used with water, hydraulics and HPA. Apparently Metric stuff is another thing altogether.
MIP, NIP, and FIP work together, but are not compatible with any other types. Let’s begin by taking a look at various common pipe thread types:
NPT or NPS: This is the national pipe tapered or straight. It is most common in North America.
MIP or FIP: This is the Male or Female Iron Pipe. They have the same thread dimensions as National Pipe Thread (NPT).
BSP (T) or BSP (S): This stands for Standard pipe tapered or straight. It is most common in Europe.
NPT and NPT Fitting
NPT basically stands for National Pipe Taper, which is a term defined by American National Standards Institute (ANSI).
It is used to describe residential-grade pipe systems.
This type of thread fitting can be used with FNPT or rather female NPT fitting in residential water as well as hydraulic systems.
It turns out that I only have 2 different thread sizes on all the quick connectors and micro bore hoses I have on hand.
- 1/8" NPT
- M10x1 Metric Non Tapered
If you try to thread two different thread count parts together, they of course will act like they are going to fit fine, but they jam up eventually if the thread junction is long enough. If you force them together, you can probably get a good seal but you are going to damage the threads on one or both of the parts. Jamming a steel connector into a brass one will probably just damage the brass one. Something to consider if you are in a pinch and don't mind sacrificing the brass part.
As for the male quick connect parts on guns and hoses, as discussed quite a bit on AGN, there is no standard. You can make oversized male QC parts smaller by turning them down or polishing with wet dry sandpaper in a lathe, but you can't make them larger without spending a LOT of money on a $6 part.
If I get bored enough, I might add more information for the following. Feel free to post a link that shows all this stuff or give the specs and I will add them to this first post in the thread.
Tank and Fill Station Threads
Threaded Tank Opening Specs
- M18*1.5 Threads - CE/EN12245 Standard Carbon Fiber Tanks
- 0.875-14UNF - Most 310 BAR US Made SCBA Tanks
- 0.750-16UNF - Most sub 310 BAR US Made SCBA Tanks
- 3/4"X14 UNF or 7/8"-16 UNF- For most SCUBA Tanks (From a quick search)
- CGA347 Standard (Thread Specs?) - Most SCBA Fill Station/Regulator connections on the SCBA main valve
- SCUBA Tanks (Probably won't look this up.)
Last edited:
