Cable accessory Rittal 4051.723 polypropylene ferrules 8 mm length, 4.2 mm diameter, grey, pack of 500

Rittal 4051.723 polypropylene ferrules are supplied as a pack of 500 grey ferrules, each with an overall length of 8 mm and an inner diameter of approximately 4.2 mm. These ferrules are intended to terminate and insulate stranded conductors, producing consistent, compact ends for insertion into connectors, terminal blocks and other electrical connection points commonly found in control panels and wiring systems.

Advantages

The polypropylene construction provides electrical insulation, mechanical protection and resistance to common workshop conditions. A uniform length and diameter across the pack enables repeatable crimping and consistent conductor presentation, reducing loose strands and improving connection reliability. The neutral grey colour supports easy visual integration into cabinets and wiring harnesses.

Suitable for (tasks / use cases)

• Terminating stranded copper conductors for screw-type terminal blocks
• Preparation of wires for industrial control panels and distribution boards
• Bundled wiring and harness assemblies where neat, reliable ends are required
• Electrical installation and maintenance tasks in workshops and machine rooms

When it may not be suitable

These ferrules are designed for general-purpose insulation and termination of conductors that fit the specified length and diameter; they are not intended for direct use on solid (single-core) rigid conductors that do not require ferrules. They are also not suitable where specialised high-temperature, chemical-resistant or flame-retardant materials are mandatory unless specified by the installation standards.

Key specifications

• Material: polypropylene
• Pack quantity: 500 pieces
• Length: 8 mm
• Inner diameter: approximately 4.2 mm
• Colour: grey

How to use

Strip the conductor to the correct insulation length, insert the stranded conductor fully into the ferrule barrel, and use a suitable crimping tool matched to the ferrule dimensions to form a secure mechanical and electrical connection. After crimping, inspect the ferrule to ensure the conductor is fully enclosed and that there are no loose strands. Insert the terminated conductor into the terminal or connector and tighten according to the connector manufacturer’s torque recommendations.

What to consider before purchase

• Confirm compatibility of ferrule inner diameter and length with the conductor cross-section and terminal type you use
• Verify material properties meet any workplace standards for insulation, temperature and chemical exposure
• Ensure you have an appropriate crimping tool sized for these ferrules to achieve reliable terminations

Usage recommendations

For consistent results, use a dedicated ferrule crimping tool and check terminations with a pull test or continuity check after installation. Store the pack in a dry environment to prevent contamination and ensure the ferrules remain clean prior to use.