Why Choose the Partex URR37 M3.5 Uninsulated Ring Terminals?
The Partex URR37 is a high-quality M3.5 uninsulated ring crimp terminal designed to provide secure and reliable electrical connections in industrial wiring, electrical installations and control panel applications. Manufactured from electro-tinned electrolytic copper, these terminals offer excellent electrical conductivity and corrosion resistance, making them suitable for professional electrical termination work.
As part of the Partex UR uninsulated ring terminal series, the URR37 is designed for terminating stranded copper conductors with a cross-sectional area of 0.5–1.5 mm² (22–16 AWG). The ring-shaped connection fits an M3.5 screw or stud, providing a secure mechanical connection that remains captive beneath the fastening screw or bolt. The electro-tinned copper construction and brazed barrel seam help provide a strong, dependable crimp connection when installed using a suitable crimping tool.
Supplied in a convenient pack of 100 terminals, the Partex URR37 is an economical and practical solution for electricians, panel builders, maintenance engineers and industrial automation professionals. Its compact design makes it particularly useful for electrical control cabinets, terminal connections and equipment wiring where reliable electrical continuity is essential.
Key Advantages
- Reliable M3.5 uninsulated ring terminals for secure electrical connections.
- Suitable for 0.5–1.5 mm² stranded copper conductors.
- Electro-tinned copper construction provides excellent electrical conductivity and corrosion resistance.
- Brazed barrel seam supports strong, consistent crimp terminations.
- 3.7 mm ring hole diameter designed to accommodate M3.5 fixing studs.
- Closed-ring design helps prevent accidental disconnection from screw and stud terminals.
- Compact construction suitable for industrial control panels and electrical equipment.
- Supplied in a pack of 100 for efficient installation and maintenance work.
Key Features
- Partex UR uninsulated ring terminal series.
- M3.5 stud compatibility with a 3.7 mm fixing hole.
- 0.5–1.5 mm² conductor capacity (22–16 AWG).
- C1100 electrolytic copper terminal material.
- Electro-tinned surface finish for improved corrosion resistance.
- Brazed seam construction for reliable crimp joint strength.
- 3.45 mm barrel diameter and 4.3 mm barrel length.
- 0.75 mm palm thickness.
- Uninsulated design for applications requiring bare metal crimp terminals.
- Suitable for professional crimp termination using correctly sized tooling.
- Supplied as 100 individual ring terminals per pack.
Technical Specifications
- Manufacturer: Partex
- Series: UR Uninsulated Ring Terminals
- Model: URR37
- Product type: Uninsulated ring crimp terminal
- Terminal style: Closed ring
- Stud size: M3.5
- Ring hole diameter: 3.7 mm
- Conductor cross-sectional area: 0.5–1.5 mm²
- Conductor size (AWG): 22–16 AWG
- Terminal material: C1100 electrolytic copper
- Surface finish: Electro-tinned
- Barrel construction: Brazed seam
- Barrel diameter: 3.45 mm
- Barrel length: 4.3 mm
- Palm thickness: 0.75 mm
- Insulation: Uninsulated
- Voltage rating: 600 V
- Operating temperature range: -40 to +180 °C
- Termination method: Crimp connection
- Mounting type: Screw / stud fastening
- Pack quantity: 100 pieces
Reliable Electrical Connections for Industrial Wiring
Ring terminals provide a secure method of connecting electrical conductors to screw terminals, threaded studs and electrical equipment. Unlike open-ended fork terminals, the closed-ring design surrounds the fixing stud, helping maintain a dependable mechanical connection and reducing the risk of the terminal becoming detached if the fastening screw loosens.
The Partex URR37 uninsulated ring terminal combines a high-conductivity copper body with an electro-tinned finish to support reliable electrical contact in demanding installation environments. Its brazed seam barrel is designed to maintain joint integrity during crimping, while the compact M3.5 ring connection is suitable for electrical control systems, equipment terminals and industrial wiring assemblies.
For correct installation, the conductor should be stripped to the appropriate length and inserted fully into the terminal barrel before crimping with a tool and die suitable for 0.5–1.5 mm² uninsulated terminals. As the URR37 has no insulating sleeve, appropriate electrical insulation or protective measures must be provided wherever required by the installation design.
Typical Applications
- Industrial electrical control panels and switchgear wiring.
- Electrical distribution and equipment connections.
- PLC control cabinets and industrial automation systems.
- Machinery wiring and equipment assembly.
- Electrical maintenance, repair and refurbishment.
- Control circuit and low-voltage wiring terminations.
- Motor control panels and associated auxiliary circuits.
- OEM electrical equipment manufacturing and panel building.
