Grommet - male thread - N - 35mm-R6/4" IVAR.IVN81

Product detailed description

This press fitting with external thread is commonly used in residential and commercial buildings for connecting press pipes to threaded devices in heating, plumbing and industrial systems. It ensures a reliable connection in environments where resistance to corrosion and high temperatures is required. The fitting is frequently used in closed-loop systems such as underfloor heating, hot water circuits and fire suppression systems. Installers working on systems exposed to fluctuating temperatures and pressures will find this component suitable for its intended service range.

The fitting is designed to be pressed onto a 35 mm stainless steel pipe using a certified pressing tool. The external thread allows for direct connection to valves, meters or other threaded components. It is essential that the pipe end is properly prepared and free from burrs or damage before pressing to ensure a leak-free connection. The pressing depth indicator ensures correct positioning during installation.

Technical parameters

Material	Stainless steel grade 1.4404 (AISI 316L), EPDM O-ring
Operating temperature	-20 °C
Nominal pressure	PN 16
Code	IVN81.3516
Brand	IVAR

The operating temperature range extends from -20 °C up to +85 °C, with a maximum allowable temperature of +120 °C. This makes it suitable for both cold and hot water applications, as well as for solar and industrial systems. The nominal pressure rating of PN 16 indicates that the fitting can withstand internal pressures up to 16 bar at reference conditions. These parameters are critical when selecting fittings for specific system designs and must be matched to the system’s operational requirements.

Installation and connection

To install the fitting, begin by cutting the stainless steel pipe to the required length using a suitable pipe cutter. Ensure the cut surface is smooth and free from debris. Insert the pipe into the fitting until the end of the pipe touches the inner shoulder of the fitting. Use a pressing tool compatible with the fitting’s size to apply pressure according to the manufacturer's instructions. After pressing, verify the pressing depth indicator is engaged at 54 mm. Check for any visible misalignment or damage. Common installation errors include using non-certified pressing tools, failing to align the pipe correctly within the fitting, or attempting to reuse a fitting after pressing.

Compatibility and accessories

This fitting is compatible with 35 mm stainless steel pipes of the same material class and with standard threaded components. To complete the installation, ensure the threaded side is connected to a corresponding female thread. Additional components such as valves, pressure regulators and flow meters may be needed depending on the system configuration. Related products should be selected based on their material compatibility and operating parameters.

Technical background for designers

The fitting operates on the principle of mechanical compression, where the pressing tool deforms the pipe wall around the fitting body to create a tight seal. The stainless steel construction offers high resistance to corrosion and thermal expansion, making it suitable for long-term use in aggressive environments. The EPDM O-ring provides a flexible sealing interface that compensates for minor misalignments and maintains integrity under varying loads. The system’s performance depends on correct installation, material compatibility and adherence to pressure and temperature limits.

Service and operation

Regular visual inspections are recommended to ensure the connection remains intact and free from signs of leakage or mechanical stress. No scheduled maintenance is required beyond these checks. If a leak is detected, the fitting should be replaced as re-pressing is not permitted. During operation, avoid subjecting the fitting to excessive mechanical loads or vibrations that could compromise the connection.

Frequently asked questions

Can this fitting be used in solar heating systems?
Yes, the operating temperature range and material properties make it suitable for solar applications where temperatures may exceed ambient levels.

Is it compatible with press tools from other manufacturers?
Only tools certified for use with IVAR press fittings should be used to ensure a secure and leak-free connection.

What is the maximum allowable temperature for this fitting?
The fitting is rated for continuous operation up to +85 °C, with a maximum allowable temperature of +120 °C for short periods.

Can the fitting be reused after pressing?
No, once pressed, the fitting cannot be reused. Any damaged or incorrectly pressed fitting must be replaced with a new one.