Untapped technique to help you to buy pneumatic air fitting from China. It also include some tips to help you choose right air fittings to save your cost.

1. Help you choose pneumatic air fittings from China – Untapped tips
Help you choose pneumatic air fittings from China – Untapped tips
As automation system and air tools are used widely, pneumatic air fittings have a
wide application. But still a lot of people are not sure how to choose right pneumatic
air fittings. Right pneumatic air fittings means good fitness, good price, good quality
in some sense. Let’s see what is called pneumatic air fittings firstly.
What is pneumatic air fittings
Pneumatic air fittings are used for carrying compressed air, connect different
pneumatic systems. Compared to hydraulic fittings, pneumatic air fittings are
typically characterized by tighter seals and lower pressure requirements. As
pneumatic systems have much variety and complexity, it request pneumatic fitting
has different shapes and different purpose.
Advantage of pneumatic air fittings
 Hundreds of tubes size and thread combination to meet with different
demand.
 Low cost, easy to change and maintain
 Some series of fittings can be used for water.

2. Types of pneumatic air fittings
When choose a pneumatic air fittings, below factors need to be considered:
 • Working pressure
 • Working environment
 • Working temperature
 • Fluid type ( air, water, oil, etc)
 • Fitting material (plastic, brass, aluminum, zinc, stainless steel)
 • Shape (straight, elbow, etc.)
 • Size (tube size and thread size)
 • Approvals certificate (for example: Department of Transportation,
Underwriters Laboratory, FDA, CE, ROHS)
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Plastic push in fitting
Plastic push in fitting is the most used one of pneumatic fittings. It is designed for
Polyurethane and Nylon tubing, can be used for a regular working environment,
mainly fluid is air.
Features:
1. Fluid type: Air ( No other gases or liquids ).
2. Working pressure: 0-150psi
3. Negative pressure: -29.5 in Hg
4. Working pressure: 0-60 degree
5. Material as below
 Body material: PBT;
 Release sleeve: POM;
 Sealing: NBR;
 Collar: Nickle-plated Zinc;
 Lock claw: SUS;
 Metal body: Nickle-plated Brass;
 Thread: Pre-coated sealant;
 O Ring: NBR
6. Size: Pipe size has metric and inch two typies;

3. The thread mainly includes BSPP, BSPT, NPT(1/8″, 1/4″, 1/2″, 3/8″, 1″)
Advantage: Plastic is light and able to withstand a significant amount of pressure.
Moreover, plastic fittings are very affordable.
Disadvantage: Can’t understand high pressure and high temperature.
TIPS
When you choose plastic push in fittings, please do not consider prices only. Please ask supplier
how to test, certificate and which customer they have.
Some supplier also would like to accept small orders, this type is very common and have some
stock usually.
Now many manufacturers are developing new series to compete with market. If you have interst,
please inquiry new series to win your profit.
Brass push in fitting
Brass push in fittings is brass pneumatic fittings. They are generally made from
nickel-plated brass, though some composite fittings made of glass-reinforced nylon
are available as well. Brass push in fittings are easy to disconnect and reconnect,
making them excellent for any environment where frequent changes are necessary.
They are usable with nylon, polyurethane, PE and some less common tube types.
Features:
1. Fluid: Compressed air
2. Working pressure: -0.8-15bar
3. Application tube: PU, PE, PA tube.
4. Size: Pipe size has metric and inch two types, thread side has BSPP, BSPT, NPT
three types. (1/8″, 1/4″, 1/2″, 3/8″,1″)
5. Working pressure: -10-60 degree

4. Material: all brass with NBR seals or Viton seals.
Advantage: It has a easy structure, can be used for high temperature environment.
They are more durable and cost effective.
Disadvantage: It’s not allowed in a corrosive environment.
TIPS
Brass push in fittings usually have two structures, one is similar with plastic push in fittings, we
called B structure . The other is only brass body and brass collect and O-ring, we called A
structure. A structure is very simple, can burden more pressure, but easy to hurt the tube
surface. B structure has a lower pressure, but it is more durable than plastic fittings.
For seals, regular seal is NBR. If you have high temperature requirement, please request viton
seals.
Brass push in fitting
Stainless steel push-in fittings are also applied in pneumatic field. So it is also called
stainless steel pneumatic fittings. They allow fast circuit assembly for conveying
compressed air, gas or liquids at a wide range of pressures and temperatures.
Connection and disconnection is immediate and manual.Usually the material is
SS316, so it allows corrosive gas and liquid to through.
The stainless steel collet design ensures superior clamping with various types of tube
such as nylon, polyethylene and polyurethane. Used in pneumatic applications like
robotics, conveyer systems, and any system requiring the transfer of compressed air
or liquids compatible with the materials of manufacture.
Features:
1. Operating Pressure: -0.99 bar~15 bar
2. Operating Temperature: -20~200 degree
3. Application: Air, vacuum, steam, drinking water and food
4. Recommended Tubing Material: PA, PU, PTFE, FEP, PE TUBE
5. Size: Pipe size has metric and inch two types, thread side has BSPP, BSPT, NPT
three types. (1/8″, 1/4″, 1/2″, 3/8″, 1″)

5. 6. Types: Straight, Elbow, Tee, X, Y,
7. Applation: NYLON, PU, PTFE, FEP, PE TUBE, etc.
8. The internal seal is a factor which limit the environmental temperature, VITON,
PTFE seal are available.
Material is all SS316, except for claws SS302.
Advantage: The materials ensure Anti-corrosion highly ,all of them are made from
SUS316 expect the seal ring. High temperature and high pressure and
corrosive environment are available.
Disadvantage: As it has a good performance, the only one disadvantage is the high
of the price.
TIPS
Stainless steel push in fittings structure is similar to plastic push in fittings. It is used for harsh
environment.
Cost is quite expensive, but it is worthy to invest.
Please do not consider the price, just consider the quality. You need samples to test and check.
Push on fitting
Pneumatic Push on fitting is also named rapid screw fitting, it’s used for pneumatic
industry widely.
Push on fitting is used for pneumatic soft tube, it can grasp the pipe steadily.
The swivel part can avoid the twist of the pipe, so it’s more steady than push in
fittings.
Features
1. No special tools or clamps are required for installation.
2. Assemblies can be done in seconds.

6. 3. Push-On fittings are reusable. Just replace the hose with no special tools.
4. Faster and easier maintenance.
5. Fluid Type: compressed air (For other fluid, please contact us).
6. Working Pressure: -0.8~15 bar.
7. Application Tube: PU, PE, PA tubes.
8. Working Temperature: -10~60 degree
9. Size: Thread side has BSPT, BSPP, NPT and metric size are available; hose diameter
has
millimeter and inch two types. (1/8″, 1/4″, 1/2″, 3/8″, 3/4″, 1″)
Advantage: The nut can grasp the hose steadily, it can work in a high temperature
and
high pressure environment. This fitting is more reliable than other fittings.
Disadvantage: Has no quick connect function, it need a wrench to tighten the nut.
TIPS
Before choose, a features of it need to know. Usually a soft tube is more suitable for this fitting,
because the screw nut can grasp the hose tightly. Then consider the working environment, it can
be used for a high pressure, if you use them for a normal working environment, you can choose
other type fitting to save cost.
Structure is very simple, cost is cheaper than brass push in fittings.
Compression fitting
A pneumatic compression fitting relies on a nut or other similar device being
screwed down over a ferrule, compressing it. The compression of the ferrule causes
it to bow inward, compressing the tube, the fitting, and the receiving fitting together
to form a tight seal. Compression fittings are appropriate for copper, aluminum, and
plastic tubes, and are themselves usually made of brass.
Features:
1. No flaring or soldering needed.

7. 2. Tube compatibility: Available in inch dimension only, Copper, Aluminum,
Thermoplastic.
3. Thread availability: Male pipe , Female pipe.
4. Body material: Brass.
5. Used for high pressure environment.
6. Working pressure and temperature depend on tube pressure.
7. Fluid Type: water, air, oil, diesel, and other fluids.
Advantage:
Nylon tube and metal tube are available, fluid types are diversified, and has
a wildely usage in different environment.
Disadvantage: The price is higher than normal fiting.
TIPS
Pneumatic compression fittings are used to connect copper tubes. High cost but quality assured.
For rigid nylon tubes, we advise you buy internal tubes to fix.
Brass connector
Brass connector is a joint to connect different pneumatic fittings, it’s more
convenient to used in different industrial fields. Union, straight, elbow ,etc shapes
are available. And different environment has same reliable performance.
Features:
1. Fluid type: Air, water, oil, diesel and other liquids.
2. Working temperature: -40-120 degree
3. Working pressure: 0-50bar
4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 1/2″,
3/8″, 3/4″, 1″)
5. Material: Regular material is brass Nickle-plated, steel and stainless steel are

8. available. Surface treatment has chrome
plated, zinc plated and nickle plated.
6. Shape: Straight, elbow, “x”, “y”, etc.
Advantage: Structure is simple, no additional sealants ,easy to fit different fittings, it
can endure a high pressure and
temperature environmetn.
Disadvantage: Not convenient to tighten the joint, sometimes need to notice the
leak.
TIPS
Choose a brass connector, please make sure you tell supplier the thread standard you need, it is
usually BSPT, BSPP, NPT thread.
Meanwhile, low prices always means low weight. If you care about quality, please let supplier
send you the weight and drawing. If you have big quantity, they also can make the fittings as the
drawing.
Pneumatic Quick Couping
Pneumatic quick coupling is A very important partner for air tools and spiral tubes.
According to different market, they are usually divided into Europe series, USA series,
Asia series. Three famous brands can stands for three markets.
Milton brand for USA market
Rectus brand for Europe market
Nitto brand for Asia market
Now a lot of China suppliers can replace the brand with good quality. But due to
HIGH competitions, some suppliers make it lower cost by reducing weight and
changing material. If you need high quality with large volume, please make sure you
tell your supplier your detailed requirements, like fluid, material, etc.

9. Features:
1. Fluid type: Air
2. Working temperature: 0-120 degree
3. Working pressure: 0-20bar
4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 3/8″,
1/2″)
5. Material: For different series, they have different material. Regular material is
steel, brass, aluminum.
6. Shape: Straight.
Advantage: connect and disconnect fast.
Disadvantage: Only for air. Some series also can used for water.
TIPS
Please choose quick coupling according to plug profile. Please refer to our XHnotion catalogue.
Regular material is steel nickel plated, O-ring is NBR. If you have higher requirements for material,
please do make a detailed requirement list.
Quick coupling is kind of fast valve. So please do not buy too cheap goods, please choose famous
brand like XHnotion.
Push button safety pneumatic coupling
Push button safety air coupling adds ease of operation and safety in use. Available
composite bodies make for better handling and reduce incidental damage to people.
Double click to engage properly. First click locks coupler and plug. The second click
engages the air pressure. To disconnect push button twice. First push relieves
pressure and second push allows plug and coupler to be disengaged.
Features:

10. 1. Fluid type: Air
2. Working temperature: 0-60 degree
3. Working pressure: 0-15bar
4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 3/8″,
1/2″)
5. Material: steel, brass, aluminum.
6. Shape: Straight.
Advantage: connect and disconnect fast.
Disadvantage: Only for air.
TIPS
Push button safety quick coupling is more and more popular in Europe and America
market. But costs from local suppliers are quite high.
This structure request high technique and cost to finish. Most China’s factory can not
make this coupling.
Now XHnotion is developing this structure. We hope to win the market by lower
price and stable quality.