555 M8 Power Supply Terminal Post Connector

Product Configuration

Mounting: Secure block to chassis/panel using screws through base holes.
Polarity: Connect Red block to Positive (+) output. Connect Black block to Negative (-) output.
Cabling: Use cables with M8 ring terminals. Place terminal over stud.
Securing: Fasten with an M8 nut and washer. Torque firmly to prevent overheating.
Safety: Ensure no loose strands or damage to insulation. Verify polarity before powering.

High-Current Terminals: Designed to handle high power connections, typically found in welding machines, power inverters, and heavy-duty power supplies.
Standard Size: “555” refers to a common industry-standard footprint and size for these terminal blocks.
M8 Threading: Features a robust M8 stud (threaded post) for securing ring terminals or cable lugs.
Color-Coded: Black (for Negative/N-) and Red (for Positive/P+) for easy and safe identification of polarity.
Insulated Base: Mounted on a durable plastic or nylon insulating block to prevent short circuits.
Secure Connection: Provides a reliable, screw-down connection point for heavy-gauge cables.

Description
Review

This product is a pair of high-amperage terminal blocks, specifically designed for managing the main power output connections in high-current devices like arc welding machines, power inverters, battery packs, and large power supplies. The “555” designation is a standard model number that denotes a specific physical size and mounting pattern, ensuring compatibility with a wide range of industrial equipment. Each terminal block features a substantial M8 brass stud (threaded post) that allows users to securely fasten heavy-duty ring terminals or cable lugs using a nut, creating a robust and low-resistance connection capable of conducting hundreds of amps without overheating.

The terminals are color-coded with red and black molded nylon insulating bases. The red block is universally used for the positive output terminal (+), while the black block is for the negative output terminal (-). This color-coding is a critical safety feature that prevents dangerous polarity reversal during installation or maintenance. The insulating base not only provides safety by preventing accidental contact and short circuits but also offers a sturdy platform for mounting directly to a chassis or PCB. These connectors are essential for ensuring a safe, reliable, and user-accessible power interface on high-power electrical equipment.

High Current Capacity: Engineered to handle the very high currents required by welding inverters and power systems, minimizing voltage drop and heat generation.
Secure Mechanical Connection: The M8 stud and nut system provides a much more reliable connection than plug-style connectors under vibration and stress.
Safety & Compliance: Color-coded insulation prevents accidental short circuits and incorrect wiring, enhancing user safety.
Easy Installation & Maintenance: Simplifies the process of connecting and disconnecting large cables for service or replacement.
Durability: Made from high-quality materials (brass posts, nylon housing) to withstand industrial environments, heat, and mechanical stress.
Direct Replacement: A standard part used for repairing or building industrial power equipment.

Be the first to review “555 M8 Power Supply Terminal Post Connector”

Hassan Younas – October 17, 2025

⭐️⭐️⭐️⭐️⭐️ (5/5)
Excellent Quality Terminals
Solid build and great conductivity. Perfect fit for my inverter setup — no heat or looseness even under load.
Hassan Younas – October 17, 2025

⭐️⭐️⭐️⭐️ (4/5)
Great Value for Money
Easy to install and durable. The M8 thread is strong, and the insulation feels premium.
Hassan Younas – October 17, 2025

⭐️⭐️⭐️⭐️⭐️ (5/5)
Reliable for Welding Projects
Used these on my welding machine — handles high current smoothly. Very satisfied with performance.