Rittal AS 4051.537 insulated ferrules, copper core, polypropylene sleeve, 0.75 mm² (AWG 18), length 10 mm, pack 4000

Rittal AS 4051.537 insulated ferrules are crimp end sleeves with a copper conductor and a polypropylene (PP) insulating sleeve, designed for reliable terminations of 0.75 mm² (AWG 18) conductors. Each ferrule measures 10 mm in length and is supplied in a package of 4000 pieces, providing a consistent solution for improving contact area and securing crimped connections in control cabinets, industrial wiring and general electrical assemblies.

Advantages

These insulated ferrules combine a copper core for good conductivity with a polypropylene sleeve that protects against fraying and improves insulation at the termination point. The consistent 10 mm length and uniform internal bore simplify crimping quality and repeatability. Supplied in bulk (4000 pieces), they support efficient installation workflows and reduce handling time for repetitive wiring tasks.

Suitable for

• Termination of single-core stranded copper conductors sized 0.75 mm² (AWG 18)
• Control cabinets and distribution blocks where secure, repeatable crimps are required
• Industrial machinery wiring, automation panels and terminal strip connections
• Electrical assemblies and repair work that benefit from insulated ferrule ends to prevent stray strands

When it may not be suitable

These ferrules are specific to conductors of 0.75 mm² (AWG 18); they will not fit larger or smaller conductor cross-sections correctly and may result in poor electrical or mechanical connection if used outside their intended size range. They are intended for copper stranded conductors and are not designed for directly terminating solid conductors or non-copper materials without verifying compatibility.

Key specifications

• Conductor material: copper core for electrical conductivity
• Insulation sleeve: polypropylene (PP) collar
• Nominal conductor cross-section: 0.75 mm² (AWG 18)
• Length: 10 mm
• Pack quantity: 4000 pieces
• Application: insulated ferrule for crimp termination of single-core stranded wires

How to use

Strip the conductor to the recommended length so that the bare strands can be fully inserted into the ferrule barrel. Insert the stripped wire into the ferrule until the insulation sleeve meets the wire insulation. Use an appropriately sized ferrule crimping tool or ratchet crimper to compress the copper barrel evenly, producing a secure mechanical and electrical connection. After crimping, inspect the sleeve for damage and confirm that no strands are protruding. Insert the ferrule into the terminal or connector and tighten the terminal screw to the specified torque for the application.

What to consider before purchase

• Confirm conductor type and cross-section: suitable for stranded copper conductors of 0.75 mm² (AWG 18)
• Check required ferrule length and terminal depth to ensure compatibility with 10 mm ferrules
• Verify crimping tool compatibility for insulated ferrules with a 10 mm barrel and the specified conductor size
• Assess pack quantity needs — 4000 pieces are intended for larger installation or production use

Usage recommendations

For consistent results, use a calibrated crimping tool matched to insulated ferrules of this size and perform a pull test on sample crimps. Store the ferrules in a dry, dust-free environment and keep them in the original packaging until use to avoid contamination of the internal barrel.