Nickel-plated brass push-in fittings
- Fast installation for PU/PA/PE tubing.
- Tool-free disconnection.
- Standard choice for industrial pneumatics.
Aignep is a manufacturer of components for compressed air systems and industrial media. At CPP PREMA, we offer selected product groups: push-in fittings, compression fittings, stainless steel solutions, threaded fittings and valves.
Aignep is an Italian manufacturer of components for pneumatics, industrial automation, and systems for control and distribution of technical media. The company was founded in 1976 in Bione (Brescia, Italy) and has been developing solutions for machinery, manufacturing and process industries for over 45 years.
Aignep products are designed and manufactured in Italy, with strong focus on precision, material durability and consistent performance. The company invests in automated production lines and R&D facilities aligned with Industry 4.0 principles.
Aignep supplies products to over 100 countries through a global distribution network and technical partners. The portfolio includes both standard solutions and versions adapted to specific operating conditions: higher pressure, aggressive environments, humidity or process applications.
Below are the most frequently selected product groups for pneumatic systems and technical media installations. Each card links to the corresponding category in the store.
Selection depends on tube diameter, thread type, the medium, and operating conditions. Verify installation parameters before purchase.
In practice, maintaining geometric and material compatibility across the entire system is critical. Incorrect selection of thread type or tube diameter may lead to leaks, pressure drops, and accelerated wear of installation components.
In industrial installations, also consider vibration, cyclic loads, temperature fluctuations, and the medium characteristics (dry air, lubricated air, technical water, other media). Correct selection directly impacts system durability and operational safety.
Evaluate parameters together, not individually. A mismatch in one element (e.g., thread type or tube diameter) may cause leaks, pressure loss, or fitting damage.
For industrial applications, we also recommend verifying tightening torque and material compatibility with the working medium.
Push-in speeds up installation and servicing. Compression increases mechanical stability in fixed installations.
The fitting material determines durability, corrosion resistance and permissible operating conditions. The overview below helps you quickly identify the right solution for your installation.
Nickel-plated brass is the most common choice for pneumatic installations. The nickel layer improves oxidation resistance and reduces thread wear.
Stainless steel is recommended where humidity, steam, washdown procedures or aggressive chemical environment are present.
Plastics are used as functional elements in push-in fittings and enable fast installation while maintaining connection tightness.
Even the best fitting body will not ensure long service life if the seal is not matched to the medium.
The answers below address the most common issues in pneumatic installations: tube and thread selection, leak prevention, installation and operation. If you need selection for a specific application – use the configurator or send an enquiry.
Minimum data: tube outside diameter (e.g., 6/8/10/12 mm), thread type and size (e.g., G1/8, G1/4, M5), body material (brass / nickel-plated brass / stainless steel), plus medium and operating conditions (pressure, temperature, humidity). For vibration applications, also specify tube routing and whether the connection will be frequently disconnected.
G (BSPP) is a parallel thread and is typically sealed on the face (e.g., with a gasket/washer), while R (BSPT) is a tapered thread and seals on the thread flanks. Mixing thread types often results in persistent seepage or cracking the port when tightening. If you’re not sure, check the documentation of the mating part or send a thread photo for verification.
Typical causes: angled or rough tube cut, tube ovality, contamination inside the port, tube softness not suitable for the fitting, or not inserting the tube fully to the stop. Cut the tube with a proper cutter, squarely, remove dust/chips, and always perform a “pull test” after installation.
Press the release ring (collet) evenly toward the body and then pull the tube out straight. Do not pull at an angle and do not pry the collet with tools. If the tube end is damaged or deformed, cut off the end and reinstall on a fresh section.
Compression fittings are preferred for fixed installations, higher mechanical loads, vibration, tube routing in ducts, or larger tube diameters. Push-in fittings are faster to install and service, but require correct tube type and a clean, square cut. If the connection must last for years and is hard to access, compression fittings often provide a higher safety margin.
Match the sealing method to the thread type: BSPT (tapered) is sealed on threads (PTFE tape or sealing paste), while BSPP (parallel) often requires face sealing (washer/gasket) or the manufacturer’s dedicated solution. Avoid excessive PTFE tape — it can shred and migrate into valves or flow controls.
Choose brass for simple applications in dry environments. Nickel-plated brass is the industrial standard — better surface resistance, more durable threads, and good corrosion resistance in typical plant conditions. Stainless steel is best for humidity, washdown zones, food industry and corrosive environments. Ultimately, the medium and seal material are decisive.
Top causes: wrong thread (type/size), poorly cut tube, contamination in the port, misalignment during assembly, overtightening (cracked port) or undertightening. Always verify tube OD, match the thread to the mating part, keep the assembly clean and perform a leak test after start-up.
Not necessarily. The same parameters may match different versions (e.g., different shape, series, or material version). The configurator narrows down to matching SKUs and links to the correct product pages. If you need selection for a standard, specific medium or unusual temperature — send an enquiry.
Send the tube parameters, thread type, medium and operating conditions. We will help you select the right solution and point you to the correct store category.
