DIN LL Coupling Nut

The DIN 3870 LL nut is a standardized component widely used in industrial applications, particularly in centralized lubrication systems. It is designed to meet the stringent requirements of the DIN 3870 standard, ensuring compatibility, reliability, and performance across various mechanical systems. Below is a detailed description of the DIN 3870 LL nut, covering its design, specifications, applications, and compliance with relevant standards.

1. Definition and Purpose

The DIN 3870 LL nut is a type of coupling nut specifically designed for use in lubrication systems. Its primary purpose is to connect lubrication lines, components, and accessories, ensuring a secure and leak-free connection. The "LL" designation stands for "Lubrication Line," indicating its specialized application in lubrication systems.

These nuts are commonly used in industries such as automotive, manufacturing, construction, and heavy machinery, where centralized lubrication systems are employed to deliver lubricants (oil, grease, etc.) to multiple points within a machine or system.

2. Compliance with Standards

The DIN 3870 LL nut is designed to comply with the following standards:

• DIN 3870:
  This German industrial standard specifies the dimensional tolerances, thread profiles, and performance requirements for coupling nuts used in lubrication systems. It ensures that all components meet the necessary criteria for seamless integration and optimal performance.

• ISO 8434:
  While not directly governing the DIN 3870 LL nut, ISO 8434 provides additional guidelines for the design and testing of coupling nuts, ensuring interchangeability and compatibility across different manufacturers and systems.

Adherence to these standards guarantees that the DIN 3870 LL nut is reliable, durable, and capable of withstanding the demanding conditions of industrial environments.

3. Key Specifications

Here are some critical specifications of the DIN 3870 LL nut:

• Size and Thread Diameter:
  Available in various sizes to accommodate different lubrication line diameters. Common thread diameters include M8, M10, M12, M14 etc.

• Material Grade:

• Stainless Steel (e.g., AISI 304 or 316) for high corrosion resistance.

• Brass for applications requiring good thermal conductivity and non-magnetic properties.

• Torque Rating:
  Designed to handle high torque loads, ensuring stable connections even under stress.

• Temperature Range:
  Suitable for a wide range of operating temperatures, from -40°C to +150°C, depending on the material.

• Pressure Resistance:
  Capable of withstanding high-pressure lubrication systems, up to several hundred bar.

  
  

Tube Nut DIN 3870 / ISO 8434-1