Copper Ring Type Terminals – Copper Ring Tongue Cable Lugs
Copper Cable Lugs Ring Type,
Copper Ring Type Terminals, supplied as uninsulated copper ring tongue lugs, copper compression ring terminals, and copper ring cable lugs, are manufactured by Cable Glands India from seamless electrolytic copper tube, cold formed and pressed into a closed ring tongue at one end and a crimp barrel at the other. The closed ring design fully encircles the mounting stud or bolt, giving a mechanically secure, vibration-resistant connection that an open spade or fork terminal cannot match, which is why electrical OEMs, EPC contractors, power utilities, and distributors specify ring type copper terminals for permanent bolted connections on switchgear, battery banks, earthing systems, and power and control cable termination. Copper ring terminals are supplied bare or tin-plated, in bolt hole sizes and barrel bores matched to standard conductor cross-sections from control cable up to heavy power cable.
Price: US$ 18.30 per kilogram | Custom pricing available for bulk and OEM orders
Product Overview
Function and Advantage of Ring Tongue Terminals in Cable Termination
A ring type terminal terminates a stranded or solid conductor in a closed loop that fits fully over a stud, bolt, or terminal post, so the mechanical connection cannot slip off the fastener even if the retaining nut loosens, unlike an open spade or hook terminal that can pull free. This closed-loop geometry is why ring terminals are the preferred termination for permanent, safety-critical, and high-vibration bolted connections in electrical and earthing installations.
Seamless Tube Construction of Copper Ring Terminals
Cable Glands India forms ring terminals from seamless drawn electrolytic copper tube rather than folded or welded sheet, giving the crimp barrel a continuous, joint-free wall that distributes crimp force evenly around the conductor and avoids the weak point a longitudinal seam would introduce under mechanical load or current cycling.
Cold Forming of the Ring Tongue and Barrel
The tube blank is cold formed in a press to close one end into a flat ring tongue around a bolt hole while leaving the opposite end open as a round barrel for conductor insertion, a two-stage forming operation that keeps the ring tongue and barrel concentric and free of the cracking risk associated with hot forming copper at this wall thickness.
Crimping and Termination Method
Copper ring terminals are installed by inserting the stripped conductor into the barrel and compressing the barrel wall onto the strands with a hydraulic or hand crimping tool using the die index matched to the terminal size, producing a gas-tight, low-resistance mechanical and electrical joint between terminal and conductor that does not rely on solder.
Bolt Hole and Barrel Sizing Standards
Ring tongue diameter, bolt hole size, and barrel bore are manufactured to dimensional references drawn from DIN 46234 and DIN 46235, which define standard ring terminal geometry against conductor cross-section, allowing Cable Glands India ring terminals to be matched to studs and bolts already installed in existing switchgear, busbar, and earthing hardware.
Tin Plating and Corrosion Protection
Ring terminals are supplied bare for indoor, controlled-environment use or electro-tin plated for outdoor, marine, and corrosive atmosphere installations, with the tin layer protecting the copper barrel and ring surface from oxidation that would otherwise increase joint resistance over the life of the connection.
Single-Hole vs Multi-Hole Ring Terminals
Standard ring terminals present a single bolt hole sized to one stud diameter, while heavy-current busbar and battery applications may specify two-hole ring terminals that resist rotation under torque and share mechanical load across two fasteners, a distinction made on the drawing according to the current and vibration duty of the connection.
Compliance with Ring Terminal Dimensional Standards
Copper ring terminals are manufactured to dimensional references drawn from DIN 46234, DIN 46235, and IS 8309, which govern ring tongue, barrel, and bolt hole dimensions for copper compression lugs, allowing finished terminals to be specified into installations governed by these standards.
Key Features
- Seamless drawn copper tube barrel with cold-formed ring tongue
- Closed ring geometry for secure, vibration-resistant bolted connections
- Bare and tin-plated finish options for indoor and corrosive environments
- Single-hole and two-hole ring terminal configurations
- Bolt hole and barrel dimensions to DIN 46234 / DIN 46235 references
- Sizes for control cable through heavy power cable cross-sections
- Consistent crimp performance with standard hydraulic and hand crimping tools
- Custom bolt hole and barrel length available for OEM requirements
Single-Hole Copper Ring Terminals
Single-hole ring terminals are the standard configuration for control and power cable termination onto a single stud or bolt, sized so the ring tongue matches the stud diameter while the barrel bore matches the conductor cross-section for a correctly compressed crimp.
Two-Hole Copper Ring Terminals
Two-hole ring terminals span two studs on a busbar or terminal block, resisting rotation under torque and distributing mechanical load across both fasteners, specified where vibration or high current makes rotation resistance important to long-term joint integrity.
Tin-Plated Copper Ring Terminals
Tin-plated ring terminals are specified for outdoor switchgear, marine, and corrosive industrial environments, where the tin layer protects the copper surface from oxidation and maintains low contact resistance at the bolted joint over the installation’s service life.
Bare Copper Ring Terminals
Bare copper ring terminals are supplied for indoor panel and control cabinet applications where plating is not required, offering the base conductivity of the electrolytic copper tube at a lower cost than plated variants.
Battery and Earthing Ring Terminals
Heavier-section ring terminals with larger barrel bores are supplied for battery cable and earthing conductor termination, where high current-carrying capacity and a secure, low-resistance ground connection are critical to system safety.
Custom Ring Terminal Geometries for OEM Assemblies
Cable Glands India produces custom ring tongue diameters, barrel lengths, and bolt hole sizes to OEM drawings where standard DIN 46234/46235 dimensions do not match an existing stud or enclosure design.
Technical Specifications
| Parameter | Typical Range / Value |
|---|---|
| Construction | Seamless drawn copper tube, cold-formed ring tongue |
| Conductor size range | 0.5 sq mm to 300 sq mm |
| Bolt hole size range | M3 to M20 (per DIN 46234 / DIN 46235) |
| Base material | Electrolytic tough pitch copper |
| Surface finish | Bare or electro-tin plated |
| Termination method | Hydraulic or hand crimping |
| Conductivity | Up to 100% IACS |
| Standard packaging | Bulk carton or bin, size-wise labelled |
Raw Material Grades
| Grade | Alloy Type | Key Properties |
|---|---|---|
| C11000 (ETP Copper) | Electrolytic tough pitch copper | 100% IACS conductivity, good cold formability |
| C10200 (OF Copper) | Oxygen-free copper | High conductivity, used for critical current-carrying terminals |
| C12200 (DHP Copper) | Phosphorus deoxidized copper | Good formability where subsequent brazing is required |
International Equivalent Standards
| Country / Standard Body | Equivalent Reference |
|---|---|
| Germany – DIN | DIN 46234 (ring terminals, one hole); DIN 46235 (ring terminals, two hole) |
| India – IS | IS 8309 (copper ring terminal reference) |
| USA – UL | UL 486A-486B (wire connectors reference) |
| Europe – EN | EN 60947 (low-voltage switchgear connection reference) |
| IEC | IEC 61238-1 (crimped connection test methods) |
Product Types and Variants
| Type | Description | Typical Use |
|---|---|---|
| Single-hole ring terminal | One bolt hole, standard ring tongue | General cable and control wiring termination |
| Two-hole ring terminal | Two bolt holes, rotation-resistant | Busbar and high-vibration connections |
| Bare ring terminal | Unplated copper finish | Indoor panels and control cabinets |
| Tin-plated ring terminal | Electro-tin plated finish | Outdoor, marine, corrosive environments |
| Battery / earthing ring terminal | Heavy-section, large barrel bore | Battery cable and grounding conductor termination |
| Custom ring terminal | Drawing-specific dimensions | OEM assemblies with non-standard studs |
Applications in Industry
Power Distribution and Switchgear Terminations
Copper ring terminals connect control and power conductors to switchgear terminal blocks and busbars where a bolted, closed-loop connection is required for long-term reliability.
Battery Bank and Battery Cable Connections
Heavy-section ring terminals terminate battery cables in stationary battery banks, UPS systems, and telecom power plants where a secure, low-resistance bolted connection is essential.
Earthing and Grounding System Termination
Ring terminals connect earth conductors to grounding bars, rods, and equipment earth studs, providing a permanent, corrosion-resistant termination point for protective earthing systems.
Transformer and Substation Wiring
Copper ring terminals are used for control wiring and auxiliary connections within transformer and substation control cabinets where vibration resistance is important.
Renewable Energy and EV Charging Hardware
Ring terminals terminate control and power wiring in solar inverter, battery storage, and EV charging equipment where bolted, vibration-resistant connections are specified.
Manufacturing Process
Cable Glands India manufactures copper ring terminals starting from certified electrolytic copper tube, cut to length and cold formed in a press to close one end into a ring tongue around a punched bolt hole while retaining an open barrel at the conductor entry end. Formed terminals are deburred, dimensionally checked against DIN 46234/46235 references, and where specified, electro-tin plated. Finished terminals are batch tested for barrel dimension and crimp performance, batch coded for traceability, and packed by size before dispatch.
Quality Standards and Certifications
| Standard / Certification | Scope |
|---|---|
| ISO 9001 | Quality management system certification |
| DIN 46234 / DIN 46235 | Reference standards for one-hole and two-hole ring terminals |
| IS 8309 | Indian reference for copper ring terminals |
| RoHS | Restriction of hazardous substances compliance on request |
Why Choose Cable Glands India
- Seamless drawn copper tube construction for consistent crimp performance
- Full size range from control cable to heavy power cable cross-sections
- Bare and tin-plated finishes to specification
- Manufactured to DIN 46234, DIN 46235, and IS 8309 references
- Batch-wise dimensional and crimp performance test certificates available
- Competitive per-kilogram pricing with volume and OEM discounts
Frequently Asked Questions
Q1: What is a copper ring type terminal?
A copper ring type terminal is a cable lug with a closed ring tongue at one end that fits fully over a stud or bolt, and a crimp barrel at the other end for conductor termination.
Q2: What is the difference between a ring terminal and a spade terminal?
A ring terminal fully encircles the stud so it cannot slip off if the retaining nut loosens, while a spade or fork terminal is open on one side and can pull free under vibration or if the fastener loosens.
Q3: What standards govern ring terminal dimensions?
Ring terminal dimensions are commonly referenced to DIN 46234 for one-hole terminals and DIN 46235 for two-hole terminals, alongside IS 8309 in India.
Q4: Are copper ring terminals available tin-plated?
Yes, ring terminals are supplied bare for indoor use or electro-tin plated for outdoor, marine, and corrosive environments to protect against oxidation.
Q5: What is the difference between single-hole and two-hole ring terminals?
Single-hole terminals use one bolt and are standard for most connections, while two-hole terminals span two bolts to resist rotation under torque in high-vibration or high-current applications.
Q6: How are ring terminals installed on a conductor?
The stripped conductor is inserted into the terminal barrel and compressed with a hydraulic or hand crimping tool using the correct die index for the terminal size, producing a gas-tight mechanical and electrical joint.
Q7: What conductor sizes do your ring terminals cover?
Cable Glands India supplies ring terminals for conductor cross-sections from 0.5 sq mm control cable up to 300 sq mm heavy power cable.
Q8: Can custom ring terminal sizes be manufactured?
Yes, custom ring tongue diameter, barrel length, and bolt hole size are available for OEM assemblies where standard DIN dimensions do not match existing hardware.
Q9: Do you supply test certificates?
Yes, every batch is supplied with dimensional and crimp performance test certification on request.
Q10: What is the standard lead time?
Standard lead time is 2 to 4 weeks depending on size range, plating requirement, and quantity, with expedited options available for standard DIN sizes.
International Equivalent Terms
| Language | Equivalent Terms |
|---|---|
| Spanish | Terminales de cobre tipo anillo, Terminales de ojal de cobre, Conectores de anillo de cobre |
| Russian | Mednye koltsevye nakonechniki, Kabelnye nakonechniki koltsevogo tipa, Mednye kolechnye klemmy |
| French | Cosses annulaires en cuivre, Terminaux a anneau en cuivre, Cosses a oeillet en cuivre |
| Portuguese | Terminais de cobre tipo anel, Terminais de olhal de cobre, Conectores de anel de cobre |
| Italian | Terminali in rame ad anello, Capicorda in rame a occhiello, Connettori ad anello in rame |
Linked Parts and Related Terms
Copper Ring Type Terminals, Copper Ring Tongue Lug, Copper Compression Ring Terminal, Single-Hole Ring Terminal, Two-Hole Ring Terminal, Copper Battery Terminal, Copper Cable Lug, Copper Crimp Terminal.
Related Products in this Category
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- Copper Stamped Parts
- Copper Screw Machine Parts
- Copper CNC Machined Components
- Copper Cable Lugs
- Copper Battery Terminals
- Copper Parts – Terminals (Category)
Get a Quote – Copper Ring Type Terminals
Ready to source copper ring type terminals for power distribution, battery, earthing, or OEM connector applications? Our engineering team can recommend the correct size and finish for your project.
Price: US$ 18.30 per kilogram | Custom pricing available for bulk and OEM orders
Email: sales@cableglandsindia.com
Phone / WhatsApp: +91-22-43449300
Website: www.cableglandsindia.com
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