
Vacuum Fitting Adapter (1/4) inch MNPT to (3/8) inch ID PVC, Stainless Steel
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Vacuum Fitting Conversions
Standard Sizes for Threads used in the Vacuum Component Industry
Confused by Pipe Threads used in the Vacuum Industry? |
It is actually straightforward. There are two main pipe threads used for vacuum components worldwide.
The first is NPT which is a tapered pipe thread used in the USA and regulated per the American National Standard Institute (ANSI B).
Positives: The common thread standard in North America
Seals tight thru the threads even though the technical books say it does not
Does not require rubber O-Rings or washer seals
Negatives: It is not the world standard which is Metric or G straight thread type
Requires rubber O-Rings or washer seals
The second is G which is a straight pipe thread also known in the trade as BSPP, BSPP, NPS or G, commonly used in Europe, Asia and most of the rest of the world. It is technically a Witworth thread which is actually a British Standard Pipe Parallel BSPP thread known as G. Per the ISO standard the proper designation is to use G in front of the fraction.
Positives: The common thread standard in industrialized world, The way to go if you export.
Seals tight thru O-Rings or washer seals as the technical books say it should
It insures that all items have the same height when fully tightened
Negatives: Not the North American standard
Requires rubber O-Rings or washer seals
This sounds more complicated than it is as there are basically two major pipe thread types used for these pipe fittings and many combinations work together. ANVER often builds both the tapered NPT or straight G thread versions or uses adaptor fittings to go between them. It is not an exact science as many sizes of G male fittings screw into NPT female fittings perfectly without adaptors. Here are some combinations that demonstrate this:
1. M5 and 10/32 Male fittings screw into a M5 Female equally well. However, an M5 Male will not screw into a 10/32 Female.
2. G 1/8 and 1/8 NPT Male fittings screw into a 1/8 NPT Female equally well. However a 1/8 NPT Male will not screw into a G 1/8 Female.
The 1/4 and 3/8 combinations do not work like this but 1/2 and 3/4 work reasonably well as they have the same threads per inch. In general BSPPT (Tapered) / BSPP (Parallel) threads have different angles (55 vs 60), shapes (rounded vs flattened valleys and peaks) and in most cases threads per inch than NPT.
If you would like to know if the fittings you have selected are compatible feel free to contact the factory. For a more technical explanation contact www.industrialpress.com for a copy of the + page Machinerys Handbook which is the bible for these sorts of things. The above information is a laymans explanation. If you have any comments, corrections or additions please e-mail me at [email protected] Any help is appreciated. Thanks
Pipe Size | Pipe OD | Threads Per Inch (Pitch) | What Works | |
NPT | BSPP/BSPPT | |||
1/8 | 27 | 28 | Male BSPP G into Female NPT | |
1/4 | 18 | 19 | Not recommended | |
3/8 | 18 | 19 | Not recommended | |
1/2 | 14 | 14 | Male BSPP G into Female NPT | |
3/4 | 14 | 14 | Male BSPP G into Female NPT | |
1 | 11 1/2 | 11 | Not recommended |

- , PM#1
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Vacuum pump hose size/adapter?
I bought this CFM vacuum pump, I don't need anything big. The biggest unit I deal with for my apartments is tons. I think this is the one from Amazon, if not it very similiar.
http://www.amazon.com/FJCV&sr=
At the top is an T shaped connector. The top port is a 1/4" connection that my standard yellow recharge hose can connect to. The side port, I don't know what size that is. I do know my manifold came with a 3/8" yellow vacuum hose. The 3/8" connector is too big for the side port. The side port is too big for the 1/4" recharge hose. What size is that? Can I get an adapter for the 3/8" vacuum hose?
Thanks. - , PM#2
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Im not familiar with the FJC brand, but it looks like it could be a 1/2" ACME fitting used for A on automotive AC systems. They do make adapters for it. Im surprised they didnt mention anything about in the manual.
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are you talking about the T for a micron gauge?
- , PM#4
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I just looked at the pic from your link and I think you can get an adapter at a automotive store that port is for a.
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The top port gets a cap on it.
Or you could use the larger size hose if you have one. - , PM#6
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Why can't a new member Reply with Quote. It tell me I don't have permissions to access this page. That is just
- , PM#7
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I am not familiar with how this web site works.Originally Posted by purge
Im not familiar with the FJC brand, but it looks like it could be a 1/2" ACME fitting used for A on automotive AC systems. They do make adapters for it. Im surprised they didnt mention anything about in the manual.
Manual? What Manual? All I got where instruction on adding and changing oil.
1/2" maybe. At least I sound some what intelligent when I ask for an adapter now. Thanks.
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Pump size vacuum fitting
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