Copper Lug Ring Terminal Connectors 100pcs – SC6 / SC10 / SC16 / SC25 Cable Crimp Lugs

SC-series copper ring lugs (also called cable lugs, ring terminals, or crimp lugs) are the industry standard for terminating large-gauge power cables at bus bars, battery terminals, inverter connections, and distribution panels. The barrel accepts the stripped cable conductor; the ring eye bolts directly to a stud or terminal block. Tinned copper construction provides corrosion resistance and low contact resistance across the full service life of the connection.

Key Specifications

• Material: Electrolytic copper, tin-plated (E-Cu / CW004A equivalent)
• Standard: DIN 46234 / IEC 60228 compatible
• Available Sizes:
  • SC6-6: 6mm² wire, M6 bolt hole
  • SC6-8: 6mm² wire, M8 bolt hole
  • SC10-6: 10mm² wire, M6 bolt hole
  • SC10-8: 10mm² wire, M8 bolt hole
  • SC16-6: 16mm² wire, M6 bolt hole
  • SC16-10: 16mm² wire, M10 bolt hole
  • SC25-6: 25mm² wire, M6 bolt hole
  • SC25-12: 25mm² wire, M12 bolt hole
• Current Capacity: SC6=57A, SC10=76A, SC16=101A, SC25=131A (IEC 60364 reference)
• Quantity: 100 pieces per pack

SC Lug Naming Convention Explained

The SC designation follows a simple format: SC[wire mm²]-[bolt hole mm]

• SC = Standard Copper lug
• First number = Conductor cross-section in mm² (matches wire size)
• Second number = Bolt hole diameter in mm (matches stud/terminal size)

Example: SC10-8 = 10mm² wire barrel, M8 bolt hole. Always match both numbers to your cable and terminal stud size.

What Questions Does This Product Answer?

• "What size lug do I need for 6mm² cable?" — SC6 series. Choose SC6-6 for M6 studs or SC6-8 for M8 studs.
• "Can I use SC lugs on aluminum cable?" — No. SC (copper) lugs are designed for copper conductors only. Aluminum cable requires AL-series lugs with anti-oxidant compound to prevent galvanic corrosion.
• "What crimp tool do I need for SC25 lugs?" — SC25 requires a hydraulic or heavy-duty ratchet crimp tool rated for 25mm². Hand-operated hex crimp tools (e.g., YQK-70) are suitable for SC6–SC25.
• "How many crimps should I make on an SC lug barrel?" — Typically 2 crimps for SC6–10, 3 crimps for SC16–25. Always follow the crimp tool manufacturer’s die specification.
• "Should I solder SC lugs after crimping?" — Not recommended for power applications. A proper crimp creates a gas-tight cold-weld joint. Soldering after crimping can wick solder into the stranded conductor, creating a rigid stress point that fatigues and fractures under vibration.

Typical Applications

• Automotive & marine: Battery terminal connections, starter motor cables, alternator output leads, ground straps
• Solar & off-grid: Battery bank connections, inverter DC input cables, charge controller wiring
• Industrial: Motor starter panels, bus bar connections, distribution board terminations
• Generator sets: Output terminal connections, transfer switch wiring, earthing conductors
• EV & lithium battery systems: Cell interconnects, BMS wiring, high-current DC distribution

Common Failure Modes & Prevention

• High resistance / overheating: Caused by under-crimping (insufficient crimp force) or using the wrong die size. Always use a calibrated ratchet crimp tool with the correct die for the lug size.
• Corrosion at the barrel: Moisture ingress into an open barrel end. Apply self-amalgamating tape or heat-shrink tubing over the barrel after crimping in outdoor or marine environments.
• Conductor pullout: Caused by crimping over insulation instead of bare conductor. Strip insulation to the exact barrel depth before inserting the conductor.

Package Contents

100 pieces — copper ring lug terminals in the size selected above. Supplied in resealable bag.