3M 7000031388 Copper One Hole Lug 4 Awg 35 Kv Gray

Product Description

The 3M 7000031388 is a one-piece, seamless copper one-hole lug rated for use up to 35 kV on copper conductors only. Sold individually, this lug features a 0.439-inch inner diameter and an overall length of 2.370 inches, with a 10 stud size for secure mechanical termination. The high-conductivity copper construction minimizes resistive losses at the connection point. Electricians working in medium-voltage distribution, utility, and industrial environments will find this lug suited to demanding termination requirements where performance and material integrity matter.

This lug is intended for copper conductor terminations up to 35 kV, sized for 4 AWG wire. It is appropriate for medium-voltage cable assemblies, switchgear terminations, transformer connections, and similar applications in both commercial and industrial electrical systems. The gray color coding aids identification during installation and inspection. Because it is rated for copper conductors only, it must not be used with aluminum conductors under any circumstance.

Key Features

• One-piece seamless copper construction for consistent conductivity and mechanical strength
• Rated up to 35 kV for medium-voltage applications
• 0.439-inch inner diameter accommodates 4 AWG copper conductors
• 2.370-inch length with 10 stud size for standard bolt termination
• Gray color coding for quick visual identification
• Copper-only design — not suitable for aluminum conductors

Compatibility

Designed for use with 4 AWG copper conductors in medium-voltage systems rated up to 35 kV. Suitable for OEM-style termination applications in switchgear, transformer connections, and medium-voltage cable assemblies where copper-only lugs are specified.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements and applicable local codes for medium-voltage terminations. De-energize and verify the absence of voltage on all conductors before handling or installing this lug. Use the appropriate compression tool and die set as specified for the conductor gauge to achieve a proper crimp. Do not use this lug on aluminum conductors.

Technical Specifications

• Conductor Material Compatibility: Copper only
• Voltage Rating: Up to 35 kV
• Wire Size: 4 AWG
• Stud Size: 10
• Inner Diameter: 0.439 inches
• Length: 2.370 inches
• Color: Gray
• Material: High-conductivity copper, one-piece seamless
• Weight: 0.03 pounds
• Unit of Measure: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000031388