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

Fastronix Premium 3/8" Thru-Panel Battery Terminal Connectors deliver a compact, US-made power connection rated for heavy-duty 12V use with 3/8" studs and an internal copper core.

These thru-panel terminals are designed for installers and builders who need a reliable power post that passes through metal or composite panels without risk of shorting. Built in the USA by Fastronix Solutions, the parts combine a high-current copper conductor with a non-conductive backing nut so you can mount them into panels up to 7/16" thick using a 1-17/64" hole. They are intended for battery systems, marine builds, off-grid equipment, and any application requiring a neat, secure external post for positive or negative connections.

How much current can these terminals handle?

These 3/8" studs are rated for continuous 440 amps at 12 volts and can tolerate short, momentary peaks up to 550 amps. The inner copper core helps ensure low resistance and reliable conduction under load.

• Continuous rating: 440 A at 12 V
• Momentary peak capacity: 550 A
• 3/8" threaded stud for common cable lug compatibility

What panel sizes and hole dimensions are required to install them?

Install these thru-panel posts into panels up to 7/16" (0.4375") thick. The body is sized to fit a 1-17/64" hole, giving a tidy, flush fit for most dash, bulkhead, or enclosure applications.

• Maximum panel thickness: 7/16"
• Required hole diameter: 1-17/64"
• Designed to sit flush for low-profile installations

How is electrical safety and insulation handled in metal panels?

Rather than leaving the conductive rear exposed, these terminals incorporate a durable nylon backing nut that prevents stray shorts when installed in metal enclosures. That non-conductive backing lets you mount the terminal in steel or aluminum panels without adding extra insulating washers.

• Nylon backing nut prevents contact with panel metal
• Eliminates the need for separate insulating hardware in many installs
• Robust construction suited to vibration-prone environments

What accessories or finishes work best with these posts?

The posts are compatible with standard 3/8" battery cable lugs and pair neatly with Fastronix rubber terminal covers (models 404-110 and 404-111) for a finished, protected connection. Use these covers to guard against accidental shorts and to give the installation a professional look.

• Compatible with 3/8" cable lugs and ring terminals
• Recommended covers: Fastronix 404-110 and 404-111
• Inner copper core supports heavy-gauge cables

Who is this for? Installers, hobbyists, and OEMs who need a compact, high-current thru-panel post will value these Fastronix connectors. They are suited for marine electrical panels, vehicle power distribution, solar or battery enclosures, portable power stations, and any project requiring a secure exterior power post with built-in insulation. If you want USA-made components that simplify panel mounting while supporting heavy 12V loads, these terminals are a practical, installer-friendly choice.