Copper Ground Ferrules by Impact Extrusion and Cold Forging – Manufacturer India
Cable Glands India manufactures Copper Ground Ferrules by Impact Extrusion and Cold Forging, supplying high-conductivity earthing and grounding ferrules to electrical OEMs, EPC contractors, panel builders, power utilities, switchgear manufacturers, and electrical distributors worldwide. Our copper ground ferrules are produced from C11000 ETP (Electrolytic Tough Pitch) copper using impact extrusion and cold forging processes, ensuring 100% IACS conductivity, precise dimensional tolerances, and superior mechanical performance for low-resistance earth connections in MV/LV switchgear, distribution boards, control panels, cable trays, and substation earthing systems.
Indicative Price: US$ 15.80/kilogram (ex-works Jamnagar, India; subject to size, grade, and quantity)
Product Overview
Impact Extrusion Process for Copper Ground Ferrules
Impact extrusion (also called cold impact extrusion or cold extrusion) is a cold forging variant where a copper slug is struck by a punch at high velocity in a die, causing the copper to flow either forward (forward extrusion) or backward (backward extrusion) around the punch to form hollow ferrule shapes. This process is ideal for producing copper ground ferrules, copper earthing ferrules, copper compression ferrules, copper cable ferrules, copper lug ferrules, copper end sleeves, copper splice connectors, copper pin terminals, copper tube lugs, and copper bootlace ferrules with thin walls, uniform cross-sections, and closed ends. Impact extrusion of copper produces parts with grain flow following the ferrule wall, higher conductivity (no porosity), and better mechanical strength than cast or machined equivalents.
Types of Copper Ground Ferrules
Cable Glands India produces a comprehensive range of copper ground ferrules by impact extrusion and cold forging: (i) Copper bootlace ferrules / end sleeves (uninsulated and PVC-insulated, DIN 46228-1/2/3/4), (ii) Copper pin-type terminal ferrules for terminal blocks, (iii) Copper parallel groove (PG) ferrules for overhead conductor joints, (iv) Copper compression/crimp ferrules for underground cable joints (H-type, C-type, O-type), (v) Copper earthing/grounding ferrules for substation earthmat connections, (vi) Copper ring terminal ferrules with eye hole, (vii) Copper cable lug ferrules (metric and inch), (viii) Copper C-crimp ferrules, (ix) Copper splice connector ferrules, and (x) Custom copper ferrules to drawing.
Copper Bootlace Ferrules (End Sleeves)
Copper bootlace ferrules (end sleeves / wire ferrules) are produced by impact extrusion from C11000 ETP copper to DIN 46228 Part 1 (uninsulated) and Parts 2, 3, 4 (insulated). These ferrules are crimped onto stranded copper conductors before insertion into terminal blocks (screw, spring-cage, and IDC types), circuit breakers, contactors, and relay bases, preventing wire spread, strand loss, and contact resistance increase. Our bootlace ferrules are available for conductor cross-sections from 0.14 mm² to 95 mm² (AWG 26 to AWG 4/0), in insulated (PVC sleeve in red, blue, yellow, grey, white, orange, green colours per DIN 46228 Part 4) and uninsulated versions. Tin-plated copper ferrules available for enhanced solderability and corrosion resistance.
Copper Compression Ferrules for Earthing
Copper compression/crimp earthing ferrules are cold forged from C11000 copper for permanent, low-resistance mechanical and electrical connections in earthing systems. Types include H-type compression splice ferrules (for joining two conductors end-to-end), C-type compression ferrules (for T-taps and branch connections), O-type (oval) compression ferrules (for inline splices), and sleeve-type ferrules for stranded copper earthing conductors. Used in substation earthmat connections, cable earthing and bonding, lightning protection systems, rail earthing, and temporary earthing clamps. Sized for conductors from 6 mm² to 630 mm² (AWG 10 to 2,000 kcmil). Comply with IEC 61238-1, BS 5372, and UL 486A standards.
Copper Pin Ferrules for Terminal Blocks
Copper pin-type ferrules (turned pin terminals or machined pin ferrules) are produced by cold forging and CNC machining from C11000 or C14500 (tellurium copper) for use in screw-type, spring-cage (push-in), and IDC terminal blocks. Pin ferrules provide a solid pin contact to the terminal block, giving more reliable electrical contact than bare stranded wire. Available with tin plating (standard), silver plating (for high-conductivity applications), and nickel plating (for corrosive environments). Cross-sections 0.5 mm² to 35 mm²; pin diameters 2.5–8 mm; pin lengths 8–28 mm. Compatible with Phoenix Contact, Weidmüller, Wago, Entrelec, TE Connectivity, and Legrand terminal block specifications.
Copper Parallel Groove Ferrules
Copper parallel groove (PG) ferrules are cold forged and impact-extruded for joining overhead bare copper conductors in distribution and transmission lines. PG ferrules maintain full mechanical and electrical continuity after installation using bolted or hydraulic compression tools. Types: single-run, two-run, and three-run PG connectors in AAAC, AAC, ACSR, and bare copper applications. Standards: ANSI C119.0, IEC 61238-1, BS EN 50483. Conductor ranges 25 mm² to 400 mm² bare copper. Current density rating: ≥ 100% of connected conductor current carrying capacity.
Custom Copper Ferrules
Cable Glands India manufactures custom copper ferrules by impact extrusion and cold forging to customer drawings or samples. Custom ferrule types include non-standard sizes, special bore diameters, dual-entry ferrules, offset ferrules, ferrules with integrated insulation piercing blades, ferrules with integrated solder pins, and ferrules with special coating (silver, gold, tin, nickel). Minimum prototype quantity: 1,000 pieces. Production minimum: 10,000 pieces. Tooling lead time: 2–4 weeks. Production lead time: 3–5 weeks after tool approval.
Tin-Plated Copper Ground Ferrules
Tin-plated copper ferrules are produced by applying a 3–15 µm electrodeposited tin coating (bright tin or matte tin per IEC 60068-2-58 / EN ISO 2093) on the impact-extruded copper body. Tin plating provides enhanced corrosion resistance in humid environments, improved solderability, reduced contact resistance at low clamping forces, and prevention of galvanic corrosion when contacting aluminium conductors or tinned busbar. Tin-plated copper bootlace ferrules are standard in marine electrical, automotive, and railway wiring harness applications. Available in bright tin (smoother surface, lower friction) and matte tin (lower risk of tin whisker growth).
Silver-Plated Copper Ferrules for High-Frequency Applications
Silver-plated copper ferrules (electrodeposited silver, 3–25 µm) are supplied for high-frequency connections, RF/microwave connectors, aerospace wiring, and premium switchgear where minimum contact resistance is critical. Silver has the highest electrical conductivity (106% IACS) and the lowest contact resistance of all coating metals. Used in MV/HV switchgear finger contacts, bus-tie connectors, and high-current terminal applications. Silver tarnishes to silver sulphide in H₂S-rich environments; use tin or nickel plating in these conditions.
Key Features
- 100% IACS conductivity from C11000 ETP copper (min 99.9% Cu + Ag)
- Impact extrusion process: no porosity, uniform wall thickness, excellent grain flow
- Cold forging: no heat input, no annealing needed, tight tolerances (±0.05 mm)
- Superior mechanical crimp strength vs. cast or machined ferrules
- Available: bare copper, tin-plated, nickel-plated, silver-plated
- Sizes: 0.14 mm² to 630 mm² (AWG 26 to 2,000 kcmil)
- DIN 46228, IEC 61238-1, UL 486A compliant
- RoHS, REACH, Prop 65 compliant (tin plating, no lead)
Conductivity and Electrical Performance
C11000 ETP copper (ASTM B187 / EN CW004A) provides minimum 100% IACS conductivity (58 MS/m resistivity ≤ 0.017241 µΩ·m). Impact-extruded ferrules have no internal voids or porosity, ensuring the full theoretical conductivity of the copper is achieved at the crimp joint. After crimping, the crimp joint resistance is typically 10–20% of the conductor resistance per unit length, meeting IEC 61238-1 Class A and UL 486A performance requirements. The cold work hardening from impact extrusion increases Vickers hardness from ~40 HV (annealed) to 80–110 HV, providing better retention of the conductor strands after crimping.
Crimp Performance and Mechanical Strength
Copper ground ferrules produced by impact extrusion and cold forging provide superior crimp performance: pull-out force for a properly crimped bootlace ferrule on 1.5 mm² conductor exceeds 100 N per DIN 46228 requirements. For compression earthing ferrules, pull-out strength exceeds 90% of the conductor breaking load per IEC 61238-1 Class A. The uniform wall thickness achieved by impact extrusion ensures consistent crimp deformation and eliminates stress concentrations that cause premature failure of non-uniform wall ferrules. All ferrules are tested per the relevant IEC/DIN/UL standards before despatch.
Dimensional Precision
Impact-extruded copper ferrules achieve wall thickness uniformity within ±0.05 mm, bore diameter tolerance of +0.0/-0.05 mm (for precise conductor fit), and overall length tolerance ±0.2 mm. Bore diameter is produced slightly oversize to allow easy insertion of the conductor while providing sufficient crimp grip after compression. Ferrule bore diameters conform to IEC 60228 conductor cross-sections and ASTM B8/B9 AWG sizes. All dimensional characteristics are validated per first-article inspection using calibrated gauges and CMM.
Insulation Systems for Bootlace Ferrules
PVC-insulated bootlace ferrules (DIN 46228 Part 4) use colour-coded PVC (polyvinyl chloride) sleeves bonded to the copper ferrule body for conductor cross-section identification per DIN 46228/IEC 60947-7 colour coding: grey (0.14 mm²), white (0.25 mm²), pink (0.34 mm²), orange (0.5 mm²), yellow (0.75 mm²), red (1.0 mm²), black (1.5 mm²), blue (2.5 mm²), grey (4.0 mm²), yellow (6.0 mm²), red (10 mm²), blue (16 mm²), black (25 mm²). High-temperature versions with PA (nylon) or PTFE insulation available for elevated temperature environments up to 105°C or 200°C respectively.
Technical Specifications
| Parameter | Specification |
|---|---|
| Copper Grade | C11000 ETP Copper (99.9% min Cu + Ag) |
| Process | Impact Extrusion (Cold Forging) |
| Conductivity | ≥ 100% IACS (58 MS/m) |
| Hardness (as-extruded) | 80–110 HV |
| Wall Thickness Tolerance | ±0.05 mm |
| Bore Tolerance | +0.0 / -0.05 mm |
| Length Tolerance | ±0.2 mm |
| Conductor Range | 0.14 mm² – 630 mm² (AWG 26 – 2,000 kcmil) |
| Operating Temperature | -50°C to +105°C (bare copper); -50°C to +200°C (PTFE insulated) |
| Plating Options | Bare copper, Tin (3–15 µm), Nickel (5–20 µm), Silver (3–25 µm) |
| Standards | DIN 46228 Part 1/4, IEC 61238-1, UL 486A, BS 5372 |
| Min Order Qty | 1,000 pcs (standard); 10,000 pcs (custom) |
Copper Material Grades and Equivalents
| Grade | UNS | EN (Europe) | DIN | BS (UK) | Conductivity | Use Case |
|---|---|---|---|---|---|---|
| ETP Copper | C11000 | CW004A / Cu-ETP | E-Cu58 | C101 | 100% IACS min | Bootlace ferrules, compression ferrules |
| OF Copper | C10200 | CW008A / Cu-OF | OF-Cu | C103 | 101% IACS | High-purity, RF connectors, low O₂ |
| DHP Copper | C12200 | CW024A / Cu-DHP | SW-Cu | C106 | ≥ 85% IACS | Plumbing, HVAC fittings (lower conductivity) |
| Tellurium Copper | C14500 | CW118C / CuTeP | – | C109 | ≥ 90% IACS | Pin ferrules, machined contacts (high machinability) |
Product Types and Variants
- Copper Bootlace Ferrules / End Sleeves (uninsulated) – DIN 46228-1
- Copper Bootlace Ferrules (PVC insulated) – DIN 46228-4
- Copper Pin Ferrules for Terminal Blocks
- Copper H-Type Compression Splice Ferrules
- Copper C-Type Compression Tap Ferrules
- Copper O-Type (Oval) Inline Splice Ferrules
- Copper Parallel Groove (PG) Connectors
- Copper Ring Terminal Ferrules (Lug-Type)
- Tin-Plated Copper Ground Ferrules
- Silver-Plated Copper Ferrules for Switchgear
- Custom Copper Ferrules (per drawing/sample)
Applications by Industry
- Electrical Panels & Switchgear: Bootlace ferrules for terminal blocks, busbars, circuit breakers, MCBs, contactors, relays
- Power Utilities & Substations: Compression earthing ferrules for earthmat connections, cable shield bonding, substation grounding
- EPC Contractors: Cable termination ferrules, conductor sleeves, earthing continuity ferrules
- Railways & Traction: Earthing ferrules for catenary system bonding, rail earthing, signalling systems
- Renewable Energy (Solar/Wind): DC cable ferrules for PV string connections, earthing continuity ferrules for wind turbine grounding
- Automotive & Commercial Vehicles: Wiring harness end sleeves, battery cable ferrules, grounding cable terminations
- Marine & Offshore: Tin-plated ferrules for marine wiring, cable bonding in humid/salt environments
- Telecommunications: Earthing ferrules for equipment grounding, rack bonding connectors
Manufacturing Process
Production of copper ground ferrules by impact extrusion follows this sequence: (1) C11000 ETP copper rod is drawn to precise diameter and annealed for optimum formability. (2) Rod is cut to precise slug weight on high-speed slug cutting presses. (3) Slugs are phosphate- or soap-coated for die lubrication. (4) Impact extrusion: slug is placed in die and struck by punch at high velocity (50–500 mm/s) on 200–1,500 tonne hydraulic or mechanical presses, causing copper to flow around the punch (backward extrusion) or through the die (forward extrusion) to form the ferrule body. (5) Trimming of flange/flash on trimming press. (6) Annealing (if required for ductility in compression applications). (7) Electroplating (tin, nickel, silver) – where specified. (8) Insulation sleeve bonding – for PVC-insulated bootlace ferrules. (9) 100% dimensional inspection on automatic vision/gauge sorting machines. (10) Packaging in bulk bags, plastic trays, or dispenser boxes per customer specification.
Quality Standards and Certifications
- ISO 9001:2015 Quality Management System
- DIN 46228 Parts 1, 2, 3, 4 (Ferrule terminals for electrical connections)
- IEC 61238-1 (Compression and mechanical connectors for power cables)
- UL 486A-486B (Wire Connectors – USA)
- BS 5372 (Compression connectors – UK)
- ASTM B187 (C11000 ETP Copper rod)
- EN 13602 / EN CW004A (Copper for electrical purposes)
- RoHS Directive 2011/65/EU (lead-free tin plating)
- REACH Regulation (EC) No. 1907/2006
- NABL-accredited third-party testing
Why Choose Cable Glands India?
- Specialist Impact Extrusion Facility: Dedicated impact extrusion lines for copper ferrule production in Jamnagar, India
- 100% IACS Copper: Only C11000 ETP copper used – guaranteed conductivity and crimp performance
- Comprehensive Range: Bootlace ferrules, compression ferrules, PG connectors, pin ferrules – from one source
- Competitive Pricing: US$ 15.80/kg indicative; significant volume discounts for OEM quantities
- Global Export: Supply to USA (UL 486A), UK (BS 5372), EU (DIN 46228/IEC 61238) markets
- Fast Lead Time: 3–5 weeks standard; 1–2 weeks for ex-stock standard sizes
- Technical Support: Crimp tool selection, conductor compatibility, ferrule sizing assistance
Frequently Asked Questions
What is impact extrusion and how does it differ from cold forging?
Impact extrusion is a form of cold forging where a metal slug is struck at high velocity by a punch to form a hollow shape (ferrule, tube, or cup) by backward or forward metal flow around the punch. It is ideal for producing copper ferrules with thin, uniform walls and closed ends. Standard cold forging uses controlled press strokes for solid or complex shapes; impact extrusion specifically creates hollow tubular forms in a single stroke at high production rates.
What copper grade do you use for ground ferrules?
We use C11000 ETP (Electrolytic Tough Pitch) copper as standard, providing minimum 100% IACS conductivity (58 MS/m). For applications requiring oxygen-free copper (ultra-low oxygen content for welding, vacuum, or RF applications), we can supply C10200 OF Copper. Tellurium copper (C14500) is used for pin ferrules requiring enhanced machinability.
What is the difference between uninsulated and insulated copper bootlace ferrules?
Uninsulated ferrules (DIN 46228 Part 1) are bare copper sleeves for use where insulation is not required or provided separately. Insulated ferrules (DIN 46228 Part 4) have a colour-coded PVC sleeve for conductor cross-section identification and to prevent short-circuits from adjacent ferrules in terminal blocks. Insulated ferrules are standard in industrial control panels, DIN-rail mounted terminals, and automation wiring.
What crimping tools are compatible with your copper ferrules?
Our bootlace ferrules are compatible with standard ratchet crimping tools by Weidmüller (KCR series), Phoenix Contact (CRIMPFOX series), Knipex, Rennsteig, and Klauke. Hexagonal, square, and trapezoidal crimp die profiles are available. Compression earthing ferrules require hydraulic compression tools with specific die sets; we provide die recommendations for all our compression ferrule products.
Do you supply tin-plated copper ground ferrules?
Yes. We supply tin-plated copper ferrules with 3–15 µm bright or matte tin per IEC 60068-2-58 / EN ISO 2093. Tin plating improves corrosion resistance, prevents galvanic corrosion when connecting to tinned aluminium or tinned busbar, and enhances solderability. RoHS-compliant lead-free tin plating is standard.
What conductor sizes are available?
Standard range: 0.14 mm² to 95 mm² (AWG 26 to AWG 4/0) for bootlace ferrules; 6 mm² to 630 mm² for compression earthing ferrules. Custom sizes for non-standard conductors available with minimum order quantities. Ferrule bore diameters conform to IEC 60228 Class 1, 2, 5, and 6 conductor diameters and AWG/kcmil standards.
Do your copper ferrules comply with DIN 46228?
Yes. Our uninsulated copper bootlace ferrules conform to DIN 46228 Part 1 and insulated ferrules to DIN 46228 Part 4 for all dimensions, conductor sizing, and crimp performance requirements. Pull-out force, insulation retention, electrical resistance after crimping, and dimensional parameters are all tested per DIN 46228. Test certificates available on request.
What is the minimum order quantity?
Standard sizes: 1,000 pieces minimum. Custom sizes or special plating: 10,000 pieces minimum. For long-term supply contracts, we offer blanket orders with scheduled monthly call-offs. OEM pricing available for quantities above 500,000 pieces per annum.
Can you supply pre-crimped assemblies?
Yes. We offer pre-crimped wire assemblies with copper bootlace ferrules crimped on single or both ends of cut-to-length wire, supplied in bulk bags or on wiring harness jigs. Suitable for panel builders and equipment manufacturers requiring ready-to-install wiring components.
Are your copper ferrules RoHS compliant?
Yes. All our copper ferrules use lead-free tin plating per RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The copper base material (C11000) contains no restricted substances above threshold limits. Full RoHS compliance declarations are available on request.
Multilingual Equivalent Terms
Spanish: Ferrules de Tierra de Cobre por Extrusión por Impacto, Virolas de Cobre por Forja en Frío, Terminales de Cobre por Extrusión
Russian: Медные заземляющие гильзы методом холодного выдавливания, Кованые медные гильзы, Медные наконечники методом ударного прессования
French: Embouts de Mise à la Terre en Cuivre par Extrusion à Froid, Viroles Cuivre par Forgeage à Froid, Cosses Cuivre Extrudées
Portuguese: Terminais de Aterramento de Cobre por Extrusão a Frio, Virolas de Cobre por Forjamento a Frio, Terminais de Cobre Extrudidos
Italian: Capicorda di Messa a Terra in Rame per Estrusione a Freddo, Virole di Rame per Forgiatura a Freddo, Terminali di Rame Estrusi
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Copper Forging & Copper Forged Parts | Forging and Hot Stamping | Copper Cable Lugs | Copper Earthing Clamps | Copper Compression Connectors | Copper Bus Bar | Copper Earthing Strips | Copper Ground Rods | Copper Cable Glands | Copper Pressed Parts | Copper Stamping
Get a Quote
Contact Cable Glands India for competitive pricing on Copper Ground Ferrules produced by Impact Extrusion and Cold Forging. Indicative price: US$ 15.80/kilogram (ex-works Jamnagar). Send size requirements, conductor specifications, or drawings to sales@cableglandsindia.com or call +91 22 4344 9300. We respond within 24 hours.