Cembre 2161930 S2.5-M4 uninsulated copper ring terminal for 1.5–2.5 mm² conductors with M4 stud connection.
£0.16
The Cembre 2161930, also identified as S2.5-M4, is a premium uninsulated copper ring terminal engineered to provide secure, low-resistance electrical terminations for stranded copper conductors. Manufactured from high-purity electrolytic copper with a durable tin-plated finish, it is designed for demanding industrial, commercial and OEM electrical installations.
The closed ring design provides maximum mechanical security when installed onto an M4 stud or screw, making it ideal for applications exposed to vibration or repeated maintenance. The brazed seam barrel and knurled internal surface help produce a strong crimp with excellent electrical conductivity and long-term reliability.
Designed for 1.5–2.5 mm² copper conductors, the Cembre 2161930 is widely used by panel builders, maintenance engineers and electrical contractors for control panels, switchgear, machinery and power distribution equipment.
Ring terminals provide one of the most secure conductor termination methods for screw and stud connections. Their closed-ring construction prevents accidental disconnection while helping maintain a consistent electrical contact in environments subject to vibration or mechanical movement.
The Cembre S2.5-M4 is manufactured using annealed electrolytic copper and finished with high-quality tin plating to provide excellent conductivity, corrosion resistance and dependable long-term performance across a wide range of industrial applications.
| Series | S Series Uninsulated Ring Terminals |
|---|---|
| Product code | 2161930 |
| Product type | Uninsulated copper ring terminal |
| Conductor size | 1.5–2.5 mm² |
| Stud / screw size | M4 |
| Material | Electrolytic copper |
| Surface finish | Electrolytic tin plated |
| Termination method | Crimp |
| Operating temperature | -50°C to +150°C |
| Cable stripping length | Approx. 4.6 mm |
| Packaging | Box of 100 pieces |
| HS Code | 85369010 |
| Country of Manufacture | Italy |
The Cembre 2161930 is used to terminate 1.5–2.5 mm² stranded copper conductors onto M4 stud or screw connections in industrial electrical systems.
The corresponding Cembre catalogue reference is S2.5-M4.
This terminal is designed for stranded copper conductors with cross-sectional areas from 1.5 mm² to 2.5 mm².
It is manufactured from high-purity electrolytic copper with a corrosion-resistant electrolytic tin-plated finish.
The conductor is stripped, inserted into the barrel and crimped using a suitable crimping tool before fastening the ring onto an M4 stud or terminal screw.
Cembre electrical connectors are trusted worldwide by panel builders, automation engineers and electrical contractors for delivering safe, durable and high-performance conductor terminations.
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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...