Conversions Tech Copper Compression Lug – 4/0 AWG, 1/2" Stud (Non-Tinned / Bare Copper)
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SKU: 6221-040-012-NP
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Conversions Tech Copper Compression Lug – 4/0 AWG, 1/2" Stud (Non-Tinned / Bare Copper)
The Conversions Tech Copper Compression Lug is a seamless tubular, heavy-duty electrical connector engineered for 4/0 AWG copper conductors and a 1/2" stud termination. Built from high-purity bare (non-tinned) copper, it delivers maximum conductivity and strong mechanical performance for high-current battery cables, bus bars, switchgear, and industrial power distribution in controlled or indoor environments.
- 4/0 AWG copper conductor range for very high-current cabling
- 1/2" stud ring tongue for secure bolted connections
- Seamless tubular barrel for uniform crimp compression and low joint resistance
- Bare copper (non-tinned) finish for maximum conductivity
- Rated up to 600V for AC power distribution and DC applications
- Excellent vibration and thermal cycling performance when properly crimped
Heavy-Duty 4/0 Copper Lug for 1/2" Stud Terminations
Designed for professional electrical builds, this 4/0 copper compression lug uses a seamless barrel that crimp-compresses consistently around the conductor. The result is a low-resistance connection with high pull-out strength—ideal for high-current circuits, battery banks, inverters, industrial distribution blocks, and bus bar assemblies where 1/2" hardware is standard.
This model is non-tinned (bare copper), making it an excellent choice for controlled/indoor electrical rooms and applications where tin plating is not required. For corrosive, marine, or outdoor environments, choose a tin-plated option or seal the termination with adhesive heat shrink.
Key Features
- Seamless tubular copper barrel for consistent compression and low joint resistance
- Non-tinned (bare) copper construction for maximum conductivity
- Optimized for 4/0 AWG copper cable (high-current power delivery)
- 1/2" stud hole for reliable bolted terminations on bus bars and terminals
- 600V maximum voltage rating for AC and DC distribution
- High mechanical strength suitable for vibration and thermal cycling environments
Technical Specifications
| Wire Range | 4/0 AWG |
|---|---|
| Stud Size | 1/2" |
| Stud Hole (Nominal) | 0.531" |
| Material | Seamless Copper (Non-Tinned) |
| Finish | Bare Copper |
| Maximum Voltage | 600V |
| Construction Type | Seamless Tubular |
| Application | Copper Cable Only |
Dimensions (inches)
For this 4/0 AWG seamless tubular lug series, lug body and barrel geometry remain consistent across stud sizes; only the stud hole diameter changes for the 1/2" 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) | 0.531" |
Typical Applications
- High-current battery cable terminations (battery banks, inverters, chargers)
- Bus bars and switchgear assemblies
- Grounding and bonding systems
- Industrial power distribution panels and DC systems
- 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 0.830" strip length before crimping.
- Do not use with aluminum conductors.
- For outdoor, corrosive, or marine environments, use a tin-plated lug or seal with adhesive-lined heat shrink.
Frequently Asked Questions (FAQs)
What wire size is this compression lug designed for?
This lug is designed for 4/0 AWG copper conductors.
What stud size does this lug fit?
It fits a 1/2" stud and has a nominal stud hole diameter of 0.531".
Is this lug tinned or bare copper?
This version is non-tinned (bare copper) for maximum conductivity.
Why choose non-tinned copper?
Bare copper provides very low electrical resistance and is ideal for controlled/indoor environments where tin plating is not required. For corrosive environments, choose a tin-plated option.
What voltage rating does this lug support?
Rated up to 600V for AC power distribution and DC applications.
What crimping tool should be used?
Use a hydraulic or dieless compression tool approved for 4/0 AWG copper compression lugs.
What is the recommended strip length?
The recommended strip length is 0.830".
Can this lug be used outdoors?
Bare copper is not recommended for outdoor or corrosive environments unless sealed. For those applications, use a tin-plated lug or seal with adhesive-lined heat shrink.
Is this lug suitable for aluminum wire?
No—this lug is intended for copper conductors only.
Do dimensions change across stud sizes?
No. The barrel and lug body remain consistent across stud sizes; only the stud hole diameter changes.
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.
