General
Norm	DIN 46319
Thread type	Metric
Thread standard	IEC 423
Material	Polystyrene
Colour	Light grey
Colour code	RAL 7035

The 116 M20 LGR PS lock nut from OBO Bettermann is a component for the secure fastening of screw connections in electrical installations. It is particularly used in conjunction with cable glands, protective conduits, and other installation elements where a stable and durable connection is required. The product is made of polystyrene and is available in light grey (RAL 7035), making it suitable for use in technical installations and industrial environments.

Lock nut according to DIN 46319 is the standard that defines the geometric and functional requirements for these components. The lock nut serves as a backing for the screw to ensure even tightening and a secure connection. It prevents the screw from loosening and ensures even load distribution on the base surface. The use of lock nuts is particularly advantageous during frequent assembly and disassembly operations, as it extends the service life of the screw connection.

Metric thread according to IEC 423 is the technical basis for the fit and compatibility of the component. The IEC 423 standard specifies the dimensions and tolerances for metric threads, which are used worldwide in the electrical and mechanical engineering industries. The lock nut is therefore compatible with standard screws and nuts manufactured according to this standard, enabling universal use in various installation systems.

Polystyrene as a material offers good electrical insulation properties and is chemically resistant to many industrial environments. However, special care is required when tightening polystyrene lock nuts. Due to the risk of stress cracking, these components must only be tightened moderately. Excessive preload can cause cracks in the material, which would impair the functionality and safety of the connection. This note is explicitly included in the product description and represents an important installation instruction.

The lock nut is available in light grey (RAL 7035), which allows it to be visually integrated into technical installations and industrial environments. The colour is not only aesthetic but also functional, as it improves visibility of the components during inspections and maintenance work. The colour is part of the product designation and is included in the article number 2049538.

The lock nut is typically used in combination with cable glands, protective conduits, or other installation elements where a secure and durable fastening is required. It is used in electrical installations, mechanical engineering, and industrial automation. Installation is carried out by simply screwing it onto the corresponding screw, ensuring that the specified preload is not exceeded.

Compatibility with other components according to DIN 46319 and IEC 423 is guaranteed, enabling universal use in various systems. The lock nut is not specifically designed for a particular accessory or brand, but meets the general standards standardized in the industry. This ensures easy interchangeability and use in existing installations.

Installation and mounting require no special tools or additional components. The lock nut is directly screwed onto the screw, with the specified preload to be observed. The component is used exclusively as a single part.

Operational advantages include easy handling, high compatibility with standard components, and the secure connection achieved by the lock nut. The use of polystyrene provides good insulation, thereby increasing electrical safety. The light grey colour supports maintenance and inspection, as the components are clearly visible. Adhering to the instruction for moderate preload extends the service life of the connection and prevents material fractures.

The 116 M20 LGR PS lock nut is thus a reliable and standard-compliant component for electrical installations, suitable for various industrial and technical applications. Its function is clearly defined, and its technical features comply with applicable standards, ensuring safe and durable use.