Fastronix Solutions 3/8" Thru-Panel Battery Terminal Studs — 440A Continuous, Copper Core with Nylon Backing (USA Made)

Fastronix Premium High Current 3/8" Thru Panel Battery Terminal Connectors are heavy-duty, USA-made thru-panel studs designed to deliver up to 440 amps continuous (with 550A momentary spikes) for secure battery and power distribution connections.

These thru-panel battery terminals combine an inner copper core for efficient current flow with a non-conductive nylon backing nut so you can mount them in metal or composite panels without risk of shorts. Machined for durable service in automotive, marine, RV, golf cart, off-grid and industrial applications, they accept standard 3/8" ring terminals and work with Fastronix rubber covers (404-110 and 404-111) for a finished, protected installation.

How much current can these 3/8" studs handle?

Each stud is rated for 440 amps continuous at 12 volts and can tolerate brief 550 amp momentary spikes. The inner copper core reduces voltage drop under heavy load, while the robust stud and nut assembly keeps connections mechanically secure.

• Continuous rating: 440 A @ 12 V
• Momentary surge capacity: 550 A
• Accepts standard 3/8" ring lugs and heavy gauge cable
• Copper core minimizes resistive losses

What panel types and thicknesses will these terminals mount to?

Designed for thru-panel mounting, the studs fit a 1-17/64" diameter hole and handle panels up to 7/16" thick. The included nylon backing nut creates a non-conductive barrier so you can safely install them in metal enclosures without additional insulators.

• Hole size required: 1-17/64" (approximately 31.5 mm)
• Maximum panel thickness: 7/16" (11.1 mm)
• Nylon backing nut prevents panel shorting
• Works in metal, plastic, fiberglass panels

How do I finish and protect the installation?

For a clean, weather-resistant result, pair the studs with Fastronix rubber terminal covers (models 404-110 or 404-111). Tighten ring lugs or cable clamps to the 3/8" stud and slide on a protective cover to keep corrosion and accidental contact at bay.

• Compatible with Fastronix covers 404-110 and 404-111
• Accepts crimped or soldered 3/8" ring terminals
• Torque fittings securely to avoid heating under load
• Backed by robust materials for long-term use

Are these terminals suitable for marine, automotive, and off-grid systems?

Yes — the copper core and heavy-duty stud design make these terminals appropriate for high-current environments including cars, boats, RVs, solar/generator systems, and industrial equipment. Use the nylon backing nut and rubber covers to help resist corrosion and accidental shorts in harsh or confined installations.

• Ideal for automotive, marine, RV, solar, and industrial power distribution
• Nylon backing allows safe mounting in metal cabinets and panels
• Solid copper core supports repeated high-current cycles
• Use with protective covers to extend service life

Who is this for: Installers, electricians, boat and RV owners, DIYers and system integrators who need a reliable, high-current thru-panel connection rated for heavy loads. If you require a neat, secure panel feed that handles hundreds of amps and accepts common 3/8" terminals, Fastronix Premium High Current Thru Panel Battery Terminal Connectors provide a USA-made, service-grade solution engineered for demanding electrical setups.