Cembre 2180390 A3-M16 non-insulated tin-plated copper compression ring terminal for terminating 16 mm² copper conductors onto M16 threaded studs.
£9.56
The Cembre 2180390, also designated as the Cembre A3-M16, is a professional non-insulated copper compression ring terminal designed to terminate 16 mm² copper conductors onto M16 threaded studs. Part of the established Cembre A-M terminal series, it provides a secure, low-resistance connection for industrial switchgear, control panels, machinery and electrical distribution equipment.
Manufactured from high-purity electrolytic copper tube, the Cembre A3-M16 is engineered to deliver excellent electrical conductivity and the mechanical strength needed to resist vibration and conductor pull-out. The terminal is annealed for optimum ductility during compression and electrolytically tin plated to protect the copper against oxidation and corrosion.
The Cembre 2180390 combines a 16 mm² short-barrel connection with a large M16 ring palm. Its funnel-shaped barrel entry helps guide flexible and low-stranded conductors into position, while the integrated inspection hole allows the installer to verify full conductor insertion before crimping.
Copper compression terminals create a permanent electrical connection by compressing the terminal barrel tightly around the conductor strands. When correctly installed, the resulting joint provides excellent electrical continuity, strong pull-out resistance and dependable performance under vibration, thermal cycling and mechanical stress.
The large M16 ring configuration makes the Cembre A3-M16 suitable for equipment with substantial threaded connection points, while its short barrel provides a compact termination for 16 mm² conductors. For optimum performance, the terminal should be installed using a compatible professional crimping tool and the correct die specified for the conductor and terminal series.
| Series | A-M Ring Terminals |
|---|---|
| Manufacturer part number | 2180390 |
| Product type | Non-insulated copper compression ring terminal |
| Conductor cross-section | 16 mm² |
| Approximate AWG equivalent | 6 AWG |
| Compatible conductor | Flexible and low-stranded copper conductor |
| Stud size | M16 |
| Connection angle | 180° / straight |
| Flange shape | Ring |
| Number of fixing holes | 1 |
| Material | Annealed electrolytic copper tube |
| Copper purity | Greater than 99.9% |
| Copper grade | Cu-OF CW008A |
| Surface treatment | Electrolytic tin plating |
| Barrel configuration | Short barrel |
| Barrel entry | Funnel shaped and internally chamfered |
| Installation method | Compression crimping |
| Inspection hole | Yes |
| Easy-insertion barrel | Yes |
| Insulated | No |
| Maximum voltage rating | 11 kV |
| Minimum operating temperature | -50 °C |
| Maximum operating temperature | +150 °C |
| RoHS compliant | Yes |
| HS Code | 85369010 |
| Country of Manufacture | Italy |
The Cembre 2180390 is used to terminate 16 mm² copper conductors onto M16 threaded studs in switchgear, machinery and industrial power-distribution equipment.
The terminal is designed for 16 mm² flexible and low-stranded copper conductors, equivalent to approximately 6 AWG.
The Cembre 2180390 is designed for use with M16 threaded studs and bolts.
Yes. The barrel incorporates an inspection hole so the installer can confirm that the conductor has been inserted fully before crimping.
The conductor should be stripped to the specified length, inserted fully into the funnel-shaped barrel and compressed using a compatible professional crimping tool with the correct die for a 16 mm² terminal.
Cembre A-M copper compression terminals are trusted by electrical contractors, panel builders, OEM manufacturers and maintenance engineers for secure, durable and electrically efficient cable connections.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...