Install Bay PWBK18500 18-Gauge Black Primary Wire 500 Ft Spool

The Install Bay PWBK18500 is a 500-foot spool of 18-gauge black primary wire designed for automotive, marine, and general 12-volt electrical installations. Built with 100% oxygen-free copper (OFC) conductors, this wire delivers clean, reliable signal and power transfer with minimal resistance — making it a staple for professional installers and DIYers alike.

The wire features a PVC outer insulation that provides high resistance to heat, oil, chemicals, and abrasion, ensuring long-term durability in demanding under-dash and engine-bay environments. The solid black color coding makes it easy to identify in multi-wire installations and wiring harness builds.

Key Features:

• Gauge: 18 AWG (18-gauge)
• Length: 500 feet per spool
• Color: Black
• Conductor: 100% oxygen-free copper (OFC), stranded
• Insulation: PVC — resistant to heat, oil, chemicals, and abrasion
• Voltage Rating: 12 volts
• Spool included for easy dispensing and storage

Sold as a full 500-foot bulk spool, the PWBK18500 is ideal for car audio hook-up wiring, accessory installation, trailer wiring, and other low-voltage electrical applications where a reliable, color-coded primary wire is needed in quantity.