Crimp ferrules Rittal AS 4051.539, copper with PP collar, for 1.5 mm² conductors, 10 mm length, pack of 4000

Rittal AS 4051.539 crimp ferrules are copper tubes with a polypropylene (PP) insulating collar made for 1.5 mm² conductors (approx. AWG 16). Each ferrule measures 10 mm in length with an outer diameter of 4 mm and is supplied in a pack of 4000. These ferrules provide a uniform, stripped-end termination that improves conductor contact in screw and clamp connections while preventing strand fraying and ensuring consistent crimp reliability in control panels, switchgear and other industrial wiring applications.

Advantages

The combination of a tin-plated copper sleeve and a polypropylene insulating collar offers reliable electrical contact, corrosion resistance and mechanical stability. The PP collar insulates and guides the conductor into the sleeve for easier insertion and a cleaner crimp. Consistent geometry and a defined length support repeatable crimps with hand or hydraulic crimping tools, reducing the chance of loose connections and improving assembly speed for bulk wiring tasks.

Suitable for

• Termination of 1.5 mm² (AWG 16) stranded copper conductors
• Control panels and switchgear internal wiring
• Terminal block and screw clamp connections
• Mass production and assembly lines requiring bulk ferrules
• Field service and maintenance tasks needing reliable, repeatable crimps

When it may not be suitable

These ferrules are sized specifically for 1.5 mm² conductors; they will not fit smaller or larger conductor cross-sections correctly and may compromise the crimp if used outside their intended range. They are intended for stranded copper conductors—use with solid conductors, aluminium conductors or non-recommended wire types may not provide secure electrical contact.

Key specifications

• Conductor cross-section: 1.5 mm² (approx. AWG 16)
• Sleeve material: copper (tin-plated)
• Insulating collar material: polypropylene (PP)
• Sleeve length: 10 mm
• Outer diameter (approx.): 4 mm
• Pack quantity: 4000 pieces

How to use

Strip the conductor to the correct length so that all strands enter the copper sleeve without leaving excess exposed conductor beyond the collar. Insert the stripped, stranded conductor fully into the ferrule until the insulation meets the collar. Use a suitable crimping tool sized for 1.5 mm² ferrules and apply a single, firm crimp stroke or the manufacturer-recommended crimp profile. After crimping, visually inspect the ferrule to ensure the sleeve is deformed uniformly and that the collar remains intact to provide insulation and strain relief.

What to consider before purchase

• Confirm conductor type and cross-section are compatible (stranded copper, 1.5 mm²).
• Verify compatibility of your crimping tool with 1.5 mm² ferrules and the required crimp profile.
• Ensure pack quantity (4000 pieces) matches project needs and storage capability.
• Consider whether tin-plated copper sleeves are required for your environmental conditions.

Usage recommendations

For reliable results, pair these Rittal ferrules with a calibrated manual or hydraulic crimper set for 1.5 mm² ferrules and perform a pull test on initial crimps to validate connection quality. Store packs in a dry environment to maintain the condition of the PP collars and the tin-plated copper sleeves.