Copper Crimp Ferrules

Copper Crimp Ferrules – End Sleeves and Bootlace Ferrules for Stranded Wire Termination

Copper crimp ferrules (also called end sleeves, bootlace ferrules, or wire ferrules) are tubular compression connectors used to terminate stranded copper conductors at terminal blocks, circuit breakers, switches, and control panel wiring devices. Manufactured from electrolytic copper (C11000) with tin plating, copper crimp ferrules consolidate stranded wire strands into a solid, uniform cross-section that inserts cleanly into screw or spring-clamp terminals. Used by electrical OEMs, EPC contractors, panel builders, and control system integrators in the USA and globally, copper ferrules prevent loose strand separation, reduce contact resistance, and extend terminal life.

Product Overview

Brass and Copper Parts manufactures copper crimp ferrules to DIN 46228 Part 1 (uninsulated), Part 2 (insulated), and Part 4 (twin-wire insulated) standards. Copper ferrules are available in plain copper (tinned), with plastic insulating collars in standard colour codes per DIN 46228/IEC colour conventions. Conductor size range is 0.5mm2 to 50mm2 (AWG 20 to AWG 1), with standard and custom sleeve lengths. The insulating collar facilitates ergonomic wire insertion, prevents conductor-to-conductor contact in tight wiring, and provides colour-coded size identification for maintenance efficiency in control panels.

Product Types and Variants

By Insulation Type

• Uninsulated Copper Ferrules (DIN 46228-1) – Plain tinned copper sleeve; for applications where colour coding is not required or where space is limited
• Insulated Copper Ferrules (DIN 46228-2) – Plastic collar (PA or PP) in standard colour codes; most widely used in panel wiring
• Twin-Wire Insulated Copper Ferrules (DIN 46228-4) – Accepts two conductors in one ferrule for bridging two circuits to the same terminal
• Triple-Wire Copper Ferrules – Three conductors in one sleeve; for parallel circuit connections at common terminals

By Sleeve Length

• Standard Length Ferrules (6mm, 8mm, 10mm, 12mm sleeve) – For general panel wiring, DIN 46228-2
• Long Ferrules (14mm, 16mm, 18mm sleeve) – For deep-penetration terminal blocks and cage clamp terminals
• Extra-Long Ferrules (20mm, 22mm, 25mm sleeve) – For power terminals, inverter connections, and spring-clamp power terminals

By Conductor Size

• Fine Wire Ferrules – 0.5mm2 (AWG 20), 0.75mm2 (AWG 18), 1mm2 (AWG 17)
• Standard Ferrules – 1.5mm2 (AWG 16), 2.5mm2 (AWG 14), 4mm2 (AWG 12), 6mm2 (AWG 10)
• Medium Ferrules – 10mm2 (AWG 8), 16mm2 (AWG 6), 25mm2 (AWG 4)
• Heavy Ferrules – 35mm2, 50mm2 for power cable and feeder connections

Standard Colour Coding (DIN 46228 / IEC)

• 0.5mm2 – White
• 0.75mm2 – White
• 1.0mm2 – White
• 1.5mm2 – Black
• 2.5mm2 – Blue
• 4mm2 – Grey
• 6mm2 – Yellow
• 10mm2 – Red
• 16mm2 – Black (DIN convention; alternate colours per custom specification)

Key Features

• Tinned ETP copper barrel – 100% IACS conductivity; tin coating prevents oxidation and ensures stable contact resistance
• Consolidates stranded wire into solid uniform cross-section for reliable terminal insertion
• Eliminates loose strand damage and contact arcing at terminal blocks and MCBs
• Colour-coded insulating collars for rapid size identification and maintenance traceability
• Twin-wire ferrules allow two conductors per terminal – eliminates piggyback wiring
• Compatible with all standard hand, ratchet, and automatic (pneumatic) ferrule crimping tools
• DIN 46228-1/2/4, IEC 60228, and UL 486E compliant
• RoHS 2 and REACH compliant; halogen-free collar option available

Technical Specifications

Raw Material Grades and International Equivalents

Applications in Industry

• Electrical Panel Wiring: Terminal block conductor termination in distribution boards, MCB panels, and control panels; standard practice for professional panel assembly
• Control and Instrumentation Panels: DCS, PLC, and SCADA panel wiring; signal cable terminations at I/O terminal blocks; sensor and transmitter wiring in field junction boxes
• Motor Control Centers (MCC): Control circuit wiring, interlock wiring, indication lamp circuits, and auxiliary contact wiring
• Switchgear and Protective Relaying: Secondary wiring in protection relay panels, VT and CT wiring, trip circuit wiring at switchgear terminals
• Renewable Energy: Inverter terminal wiring, monitoring panel conductors, battery management system (BMS) wiring in energy storage systems
• Automotive and Railway: Wire harness terminal protection, junction box wiring, rail vehicle control panel assembly
• Building Services and BMS: HVAC control panel wiring, building management system controller wiring, fire alarm panel conductor termination

Manufacturing Process

Copper crimp ferrules at Brass and Copper Parts are manufactured by tube drawing from ETP copper C11000 strip or rod, producing seamless or seamed copper tubes to precise inner diameter dimensions matching each conductor size. Tubes are cut to standard sleeve lengths and electroplated with tin (2–5 micron) for oxidation protection. Insulating collars are injection-moulded from UL 94 V-0 polyamide (PA6) in standard colour code. The collar is press-fitted onto the copper sleeve with positive retention. Finished ferrules are inspected for dimensional accuracy, plating uniformity, and collar fit strength before packaging in labelled dispenser boxes or bulk bags.

Quality Standards and Certifications

• DIN 46228-1 – Uninsulated Wire End Ferrules
• DIN 46228-2 – Insulated Wire End Ferrules (Bootlace Ferrules)
• DIN 46228-4 – Twin-Wire Insulated Ferrules
• IEC 60228 – Conductors of Insulated Cables (conductor class reference)
• UL 486E – Wire Connectors for Use with Fine Stranded Conductors
• EN ISO 2093 – Electrolytic Tin Plating
• UL 94 V-0 – Insulator Flammability Rating
• RoHS 2 Directive Compliant; REACH Regulation Compliant
• ISO 9001:2015 Quality Management System

Why Choose Brass and Copper Parts

• Complete range from 0.5mm2 to 50mm2 – single source for all panel wiring ferrule requirements
• DIN 46228-1, -2, and -4 standard compliance – meets European, USA, and international panel specifications
• Tinned copper sleeves – maintain contact integrity over 20+ year panel service life
• Bulk packaging options: dispenser boxes (500, 1000 pcs), loose bags, and mixed assortment kits
• Custom sleeve lengths, collar colours, and halogen-free collar materials available
• Cost-competitive pricing for OEM panel builder programs and distributor supply

Frequently Asked Questions

What is a copper crimp ferrule?

A copper crimp ferrule (also called a wire ferrule, end sleeve, or bootlace ferrule) is a short copper tube, sometimes with an insulating plastic collar, that is crimped onto the stripped end of a stranded wire. It consolidates the strands into a solid cylinder that inserts cleanly and reliably into screw-type and spring-clamp terminal blocks.

Why should I use ferrules on stranded wire?

Without ferrules, individual strands can splay, break, or bridge to adjacent terminals, causing short circuits, high-resistance connections, or terminal damage. Ferrules prevent strand fraying, ensure consistent insertion depth, and provide a gas-tight contact point that resists vibration loosening and reduces contact resistance over time.

What is the difference between DIN 46228-1, -2, and -4 ferrules?

DIN 46228-1 ferrules are uninsulated (plain copper tube). DIN 46228-2 ferrules have a plastic insulating collar for colour-coded wire size identification and conductor guidance. DIN 46228-4 ferrules are twin-wire types that accept two conductors in a single double-barrel sleeve for connecting two wires to one terminal.

What sizes are available?

We supply copper crimp ferrules from 0.5mm2 to 50mm2 (IEC/metric) and AWG 20 to AWG 1 (UL). Standard sleeve lengths are 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, and 18mm. Custom lengths are available.

What colour is used for each wire size?

Standard DIN 46228 colour coding: 0.5–1.0mm2 = White; 1.5mm2 = Black; 2.5mm2 = Blue; 4mm2 = Grey; 6mm2 = Yellow; 10mm2 = Red. Some manufacturers use alternate conventions – specify the colour standard when ordering for consistency across a project.

What crimping tool is required for copper ferrules?

Standard ratchet crimp pliers with square or trapezoidal (CRIMPFOX) die profiles are used for ferrule crimping. For high-volume panel production, pneumatic and electric automatic ferrule crimping tools with adjustable feed are available. Tool selection should match ferrule series and barrel cross-section.

Can twin-wire ferrules replace individual ferrules where two wires share a terminal?

Yes. DIN 46228-4 twin-wire ferrules are the correct solution for two-conductor terminations at a single terminal. They eliminate piggyback connections, ensure both conductors are clamped uniformly, and maintain clean wiring aesthetics in the panel.

Are halogen-free collar options available?

Yes. Halogen-free polyamide or polypropylene collar ferrules are available for projects requiring low-smoke, halogen-free (LSHF) compliance per marine, railway, or data center panel specifications.

Do copper ferrules work with spring-clamp terminals?

Yes. Copper ferrules are fully compatible with both screw-clamp and spring-clamp (push-in) terminal blocks. For spring-clamp terminals, select ferrule sleeve length to match the terminal’s conductor insertion depth requirement.

What packaging options are available?

We supply copper ferrules in labelled dispenser boxes (500 pcs or 1000 pcs per size), loose bulk bags, and mixed assortment kits. Custom packaging for OEM panel builder and distributor programs is available on request.

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Request a Quote

Need copper crimp ferrules in standard or custom configurations for your panel wiring project? Brass and Copper Parts supplies DIN 46228 compliant copper bootlace ferrules to electrical OEMs, EPC contractors, panel builders, and distributors in the USA and globally. Contact us for pricing, product datasheets, and custom packaging options.