Conversions Tech Copper Compression Lug – 4/0 AWG, 3/8″ Stud (Non-Tinned)
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SKU: 6221-040-038-NP
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Conversions Tech Copper Compression Lug – 4/0 AWG, 3/8″ Stud (Non-Tinned)
The Conversions Tech Copper Compression Lug is a seamless tubular, heavy-duty electrical connector engineered for 4/0 AWG copper conductors and a 3/8″ stud interface. Manufactured from high-purity, bare (non-tinned) copper, this lug delivers maximum electrical conductivity and strong mechanical performance in controlled or indoor power distribution environments.
The seamless barrel construction ensures uniform compression during crimping, reducing electrical resistance while improving pull-out strength and vibration resistance. The 3/8″ stud ring is ideal for battery terminals, bus bars, grounding points, switchgear, and industrial distribution blocks where standard 3/8″ hardware is used and tin plating is not required.
Key Features
- Seamless tubular copper barrel for consistent compression and low joint resistance
- Non-tinned (bare) copper construction for maximum conductivity
- Designed for 4/0 AWG copper conductors (very high-current cabling)
- 3/8″ stud hole for secure bolted terminations
- Rated up to 600V for power distribution and DC applications
- High mechanical strength for vibration and thermal cycling environments
Technical Specifications
| Wire Range | 4/0 AWG |
| Stud Size | 3/8″ |
| Stud Hole (Nominal) | 0.390″ |
| Material | Seamless Copper (Non-Tinned) |
| Finish | Bare Copper |
| Maximum Voltage | 600V |
| Construction Type | Seamless Tubular |
| Application | Copper Cable Only |
Dimensions
All dimensions shown in inches. For this 4/0 AWG seamless tubular series, lug body and barrel geometry remain consistent across stud sizes, with the stud hole changing to 0.390″ for the 3/8″ stud version.
| Overall Length (L) | 2.360″ |
| Width (W) | 1.000″ |
| Pad Thickness (T) | 0.114″ |
| Tube Thickness (TT) | 0.059″ |
| Barrel Length (BL) | 0.840″ |
| Barrel Inside Diameter (ID) | 0.551″ |
| Pad Length | 1.100″ |
| Strip Length | 0.830″ |
| Stud Hole (Nominal) | 0.390″ |
Typical Applications
- Indoor battery cable terminations
- Bus bars and switchgear
- Grounding and bonding systems
- Industrial power distribution panels
- Controlled-environment electrical rooms
Installation Notes
- Use a hydraulic or dieless compression crimp tool rated for 4/0 AWG copper lugs
- Strip conductor insulation to the specified strip length before crimping
- Do not use with aluminum conductors
- For corrosive environments, use the tinned version or seal with heat shrink
Frequently Asked Questions (FAQs)
What wire size is this compression lug designed for?
This lug is designed specifically for 4/0 AWG copper conductors.
What stud size does this lug fit?
It is designed for a 3/8″ stud and uses a nominal 0.390″ stud hole.
Is this lug tinned or bare copper?
This version is non-tinned (bare) copper. A tinned option is available for corrosive environments.
Why choose non-tinned copper?
Non-tinned copper offers maximum conductivity and is commonly used in dry, indoor, or controlled environments.
What voltage rating does this lug support?
This lug is rated for applications up to 600V.
What crimping tool should be used?
Use a hydraulic or dieless compression crimp tool rated for 4/0 AWG copper lugs and follow tool manufacturer guidance.
What is the recommended strip length?
The recommended strip length is 0.830″ to ensure full conductor insertion.
Can this lug be used outdoors?
This bare copper version is best suited for indoor or controlled environments. For outdoor use, a tinned lug or sealed termination is recommended.
Is this lug suitable for aluminum wire?
No. This lug is designed for copper conductors only.
Do dimensions change across stud sizes?
In this seamless tubular 4/0 series, the primary dimensional change is the stud hole size. Always verify tongue clearance requirements for your installation.
4 Reasons Pros Buy Direct from Conversions Tech
, we design, test, and ship every product from inside the United States— “” quality without the big-box markup.
Our , mold, and QA station behind our weatherproof boxes, conduit bodies, and power inverters. , UL-listed safety, and up to 30 % lower cost than .
Need a torque spec or an OEM quote at dawn? You’ll speak directly with the Conversions Tech engineering desk—not a script reader—for instant answers, custom kitting, and private-label options.
Bottom line: For rugged, code-compliant electrical solutions shipped fast from a trusted U.S. source, choose Conversions Tech and build it right the first time.
