Wire ferrules Rittal AS 4051.549, copper with polypropylene insulation, 0.75 mm² (AWG 18), length 8 mm, diameter 3.4 mm, pack of 4000

Rittal AS 4051.549 wire ferrules are copper conductors with a polypropylene (PP) insulated collar, designed for terminating 0.75 mm² (AWG 18) stranded wires. Each ferrule has a tube length of 8 mm and an outer diameter of 3.4 mm, providing a compact, consistent crimp end. Supplied in a pack of 4000, these ferrules are intended for use in control cabinets, automation panels and general electrical wiring to ensure reliable electrical contact and prevent strand fraying during insertion into terminals or screw connections.

Advantages

These ferrules offer a corrosion-resistant copper conductor combined with a polypropylene insulation collar that facilitates insertion and improves strain distribution at the conductor termination. The standardized dimensions (0.75 mm², 8 mm length, 3.4 mm diameter) deliver repeatable crimps with compatible crimping tools and reduce the risk of loose connections. A large pack quantity of 4000 pieces supports production runs and maintenance tasks without frequent reordering.

Suitable for

• Terminating 0.75 mm² (AWG 18) stranded copper wires for screw or spring-clamp terminals
• Wiring in control cabinets and industrial automation panels
• General electrical installations and maintenance tasks requiring reliable crimped ends
• Applications where prevention of strand fraying and consistent contact area is required

When it may not be suitable

These ferrules are specifically sized for 0.75 mm² (AWG 18) conductors; they are not suitable for larger or smaller cross-sections. For applications that require high-temperature or chemical-resistant insulation materials, the polypropylene collar may not meet the environmental demands. Where soldered terminations or specialised connectors are mandated by regulation or design, crimp ferrules should not be used.

Key specifications

• Conductor material: copper
• Insulation material: polypropylene (PP) collar
• Nominal conductor cross-section: 0.75 mm² (AWG 18)
• Tube length: 8 mm
• Outer diameter: 3.4 mm
• Pack quantity: 4000 pieces

How to use

Strip the stranded conductor to the appropriate length, insert the bare strands into the ferrule tube until the insulation collar meets the conductor insulation, and crimp using a suitable ferrule crimping tool sized for 0.75 mm² ferrules. After crimping, inspect the crimp for secure deformation of the tube and ensure the collar seats against the conductor insulation. Insert the crimped ferrule into the terminal and tighten the terminal screw or engage the spring clamp according to the terminal manufacturer's torque specification.

What to consider before purchase

• Confirm conductor cross-section compatibility: 0.75 mm² (AWG 18)
• Verify mechanical and environmental requirements for insulation material (polypropylene)
• Ensure crimping tool compatibility with ferrules of 8 mm length
• Assess pack size (4000 pieces) against project or stocking needs

Usage recommendations

Use a dedicated ferrule crimper sized for 0.75 mm² ferrules and follow terminal torque specifications to achieve reliable electrical contact. Store in a dry environment to avoid contamination of the ferrule tubes and maintain consistent crimps.