General
Material	NBR
Application	Threaded connection seal
Compatibility	Cable glands made of plastic and brass
Thread type	metric thread
Standards	DIN EN 60423, ISO 68
Pre-assembly

The article 171 M40 from OBO Bettermann is an O-ring made of NBR, specifically designed as a connection thread sealing ring for cable glands. These glands are made of either plastic or brass and feature a metric connection thread according to DIN EN 60423 or ISO 68. The sealing ring ensures sealing between the cable gland and the housing, providing a reliable and weather-resistant connection. It is intended for use in installations in the electrical and IT sectors, where secure and durable sealing is required.

O-ring
The O-ring is made of NBR (Nitrile Butadiene Rubber), an elastomeric material known for its good resistance to oils, fuels, and humid environments. The material selection ensures a long service life and reliable sealing performance under various operating conditions. The ring has a circular shape and fits precisely into the thread connection of the cable gland, enabling a tight seal.

Connection thread sealing ring
As a connection thread sealing ring, the ring is inserted into the thread connection of the cable gland, where it performs the sealing function. It is specifically designed for metric threads according to DIN EN 60423 or ISO 68, which are widely used in electrical and automation technology. The precise fit ensures secure sealing, even under mechanical stress and temperature fluctuations.

Cable glands
The sealing ring is suitable for all cable glands made of plastic or brass that feature a metric connection thread. These glands are commonly used in electrical installations, automation technology, and industrial electronics to securely introduce cables into housings. The use of the O-ring ensures that the connection is protected against dust, moisture, and other environmental influences.

Pre-assembly capability
A key advantage of the O-ring is the possibility to supply it pre-assembled and non-removable. This means the ring is already installed in the cable gland before the gland is mounted in the final device. This simplifies assembly and reduces the risk of losing the ring during installation. Pre-assembly is particularly beneficial in series production or complex assembly processes.

Compliance with standards
The sealing ring complies with DIN EN 60423 and ISO 68, the standards for metric connection threads in the electrical and electronics industry. These standards define the dimensions and tolerances of the thread to ensure universal usability and interoperability between different manufacturers. Compliance with these standards guarantees safe and standardized installation.

Applications
The O-ring 171 M40 is used in various areas of electrical and automation technology, particularly where cables must be introduced into housings. This includes, for example, enclosures, control devices, industrial sensors, cable ducts, and other electrical installations. The sealing protects electrical components from environmental influences such as moisture, dust, and splashing water.

Compatibility
The sealing ring is compatible with all cable glands made of plastic or brass that feature a metric connection thread according to DIN EN 60423 or ISO 68. It can therefore be universally used in various installation systems, regardless of the gland manufacturer. The use is independent of the specific design of the gland, as long as the thread conforms to the standard.

Installation and mounting
Installation involves inserting the pre-assembled O-ring into the cable gland, which is then screwed into the housing. The sealing effect is created by the elastic deformation of the ring under the pressure of the gland. It is important to tighten the gland correctly to ensure sufficient sealing performance without damaging the ring.

Operational advantages
The use of the O-ring 171 M40 ensures a reliable and durable seal, increasing the service life of the electrical installation. Pre-assembly simplifies the mounting process and reduces error sources. The material resistance of NBR ensures long-term functionality even under challenging environmental conditions.