Thomas Betts 58171 Square Ring Terminal 1/2 Inch Stud

Product Description

The THOMAS BETTS 58171 is a non-insulated square ring terminal designed for compression-style wire terminations in electrical and control wiring applications. The terminal features a copper contact body with a titanium nitride (TiN) plating for reliable conductivity and corrosion resistance. It measures 2.85 inches in overall length and 1.36 inches in ring width, with a 0.18-inch barrel thickness. The 1/2-inch stud size makes it suited for medium-to-large fastener terminations. Licensed electricians and panel technicians install this type of terminal when a secure, permanent crimp connection is required at a lug, bus bar, or equipment stud.

This terminal is used in residential, commercial, and light industrial electrical installations where a non-insulated compression ring lug is specified. Typical applications include panel wiring, motor control terminations, grounding connections, and equipment hookups requiring a 1/2-inch stud interface. The compression connection style requires a proper ratcheting crimp tool to achieve a gas-tight, low-resistance joint. The red color coding assists with wire gauge identification and organization during installation.

Key Features

• Non-insulated square ring terminal design for clean, compact panel terminations
• Compression connection type requires a ratcheting crimp tool for a gas-tight joint
• Copper contact material with TiN plating for conductivity and corrosion resistance
• 1/2-inch stud size for medium-to-large fastener compatibility
• Red color coding aids wire gauge identification during installation
• CSA Certified, UL Listed, and RoHS Compliant

Compatibility

Designed as an OEM-style compression ring terminal for electrical panel, motor control, and equipment termination applications requiring a 1/2-inch stud interface and a non-insulated lug style.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements. De-energize and lockout/tagout all circuits before terminating or disturbing any wiring. Use a calibrated ratcheting compression crimp tool rated for the terminal and wire gauge being terminated — do not use pliers or non-ratcheting tools, as an incomplete crimp will result in a high-resistance or mechanically weak joint. Inspect the completed crimp for full barrel compression and confirm the stud fastener is torqued to the equipment manufacturer's specification.