Fastronix Solutions 3/8" Thru-Panel Battery Terminal Connector — USA Made, 440A Continuous, Nylon Backer Nut

Fastronix Premium High Current 3/8" Thru Panel Battery Terminal Connectors are heavy-duty, USA-made thru-panel studs designed to deliver reliable 12V power distribution rated for 440A continuous with momentary 550A spikes.

These thru-panel battery terminals provide a compact, panel-mount solution when you need a professional, high-current connection without routing bulky battery cables through enclosures. Built around an inner copper core and a nylon backer nut, the connectors combine conductive performance with insulated safety so you can install them in metal panels up to 7/16" thick. They pair neatly with Fastronix rubber terminal covers (404-110 and 404-111) for a finished look and added protection.

How much current can these 3/8" studs safely carry?

The studs are rated to handle 440 amps at 12 volts continuously and tolerate momentary spikes up to 550 amps, making them suitable for demanding DC loads. Their copper core ensures low resistance and reliable long-term performance under heavy current draw.

• Continuous rating: 440A at 12V
• Momentary spike capacity: 550A
• Inner copper core for minimal voltage drop
• 3/8" stud size compatible with standard high-current lugs

What panel thickness and hole size do I need to install them?

Mounting is straightforward: the connectors fit panels up to 7/16" thick and require a single 1-17/64" hole. The included nylon backing nut secures the stud from the rear, allowing installation through metal or non-metal panels without concern for exposed conductive surfaces.

• Maximum panel thickness: 7/16"
• Drill/hole size required: 1-17/64" (approx. 33.5 mm)
• Nylon backer nut prevents shorts against metal panels
• Rear-mount design keeps wiring tidy and accessible

Are these terminals safe to use on metal enclosures?

Yes. The durable nylon backing nut isolates the terminal's rear threads and eliminates accidental shorting when installed in conductive panels. For extra protection and a polished finish, use the Fastronix rubber terminal covers intended for these studs.

• Insulating nylon backer prevents metal-to-terminal contact
• Compatible with Fastronix covers 404-110 and 404-111
• Reduced risk of electrical shorts in crowded panels
• Suitable for marine, automotive, RV, and industrial enclosures

How do I connect my cables and what accessories work best?

Cable lugs that fit a 3/8" stud are secured with a standard nut and washer for a low-resistance connection. Use appropriately sized crimp or compression lugs and, where vibration is expected, apply thread-locking practices and protective rubber covers for longevity.

• Use ring or eyelet lugs for 3/8" studs
• Choose cable gauge to match system current (consult ampacity charts)
• Pair with Fastronix rubber covers 404-110/404-111 for safety
• Tighten hardware to manufacturer torque and inspect periodically

Who is this for? These Fastronix thru-panel battery terminal connectors are made for technicians, installers, and DIYers who need a compact, high-current feed through a panel — ideal for marine boats, off-grid systems, RVs, racing vehicles, audio amplifiers, battery boxes, and industrial control panels. If you require a rugged, low-resistance 12V connection that mounts cleanly through metal or non-metal panels and accepts standard 3/8" lugs, these USA-made studs deliver a professional, serviceable solution.