General
Material	NBR
Thread type	Metric
Norm	DIN EN 60423, ISO 68
Thread size	M16
Product type	O-ring
Utilization	Sealing ring for cable gland connections

The article 171 M16 from OBO Bettermann is an O-ring seal made of NBR (Nitrile Butadiene Rubber), specifically designed as a connection thread seal for cable glands. These cable glands are made of either plastic or brass and feature a metric connection thread complying with standards DIN EN 60423 and ISO 68. The seal ensures a watertight and dust-tight connection between the gland thread and the component being connected. Its use is particularly common in electrical and installation technology, where reliable sealing is required during the installation of cable glands on electrical devices, enclosures, or other installation components.

Applications
The O-ring seal 171 M16 is used in electrical installations where cable glands with metric threads are mounted. It is suitable for applications requiring a tight connection between the gland and enclosure or other components to prevent moisture, dust, or other environmental influences. Typical use cases include mounting cable glands in enclosures, distribution boxes, socket outlets, or other electrical devices operated indoors or outdoors. Standards DIN EN 60423 and ISO 68 define the thread dimensions for such connections, ensuring compatibility with standard cable glands.

Functions and Features in Detail
The seal is made of NBR, an elastomeric material known for its good resistance to oil, fuel, and other chemical influences. The O-ring shape enables uniform sealing across the entire contact surface. The designation 171 M16 refers to the specific ring dimensions designed for an M16 thread. The rings can be pre-mounted securely, increasing installation efficiency and preventing loss of individual rings during installation. This is particularly advantageous in industrial or complex installation scenarios, where loss of small components can cause delays.

Technology Explained Simply
An O-ring seal functions through elastic deformation: during installation, the ring is compressed between two surfaces (e.g., gland and enclosure) and slightly expands. This creates a tight fit that compensates for pressure and movement, ensuring a durable seal. The choice of NBR material offers a good balance of elasticity, chemical resistance, and temperature resistance, making it suitable for use in electrical and installation technology. Standards DIN EN 60423 and ISO 68 define the exact dimensions and tolerances for metric threads commonly used in the electrical industry. Compliance with these standards ensures universal compatibility of the seal with various cable glands.

Compatibility and Accessories
The O-ring seal 171 M16 is compatible with all cable glands featuring a metric connection thread according to DIN EN 60423 or ISO 68. This includes both plastic and brass glands commonly used in electrical installations. The seal is used directly during gland installation, either pre-mounted or installed on-site.

Installation and Mounting
Installation involves placing the O-ring into the threaded connection of the cable gland before screwing it into the corresponding enclosure or component. The option to supply the ring pre-mounted securely simplifies the workflow, especially in series installations or complex setups. Sealing is achieved through the elastic deformation of the ring under pressure, creating a tight connection. No special tools or mounting aids are required, as the gland can be installed using a screwdriver or pliers.

Operational Advantages
Using the O-ring seal 171 M16 ensures reliable sealing, increasing the lifespan of the installation and preventing moisture or dust ingress. The pre-mountable version reduces installation time and minimizes the risk of loss. The NBR material provides high resistance to environmental influences, ensuring long-term stability of the seal. Conformity with DIN EN 60423 and ISO 68 standards guarantees universal compatibility with standard cable glands, simplifying planning and procurement.