ACDelco 18A81999B Gold Fully Coated Rear Disc Brake Rotor - Solid, Cast Iron, 5-Lug

The ACDelco 18A81999B Gold Fully Coated Rear Disc Brake Rotor is a premium-grade replacement disc brake rotor engineered to deliver reliable stopping performance. Part of the ACDelco Gold (formerly Professional) line, this rotor is manufactured to meet OE specifications for fit, form, and function, making it a trusted choice for General Motors vehicles as well as a wide range of other makes and models.

COOL SHIELD™ Fully Coated Construction:

• Full-surface zinc coating — baked-on zinc covers the entire rotor surface, including edges and internal vanes, for superior corrosion resistance compared to uncoated rotors
• 200-hour salt-spray tested — the protective micron-thin coating layer is proven to inhibit environmental corrosion in up to 200 hours of industry-standard salt-spray testing
• Stays cleaner longer — fully coated surface resists rust and brake dust buildup better than non-coated rotors
• Solid cast iron construction — manufactured from high-quality cast iron for long-lasting durability and consistent braking performance
• 5-lug configuration — designed for 5-lug hub applications with a 115mm (4.528 in) bolt circle diameter
• Inspected for balance — rotor is balance-checked to help minimize vibration, pedal pulsation, and brake noise
• No machining required — installs directly out of the box for a straightforward service experience
• Meets GM OE specifications — manufactured to GM fit, form, and function standards and backed by General Motors

Key Specifications:

• Position: Rear
• Construction: Solid (non-vented)
• Material: Cast Iron
• Outside Diameter: 11.339 in (288 mm)
• Nominal Thickness: 0.472 in (12 mm)
• Overall Height: 1.801 in (45.75 mm)
• Inside Diameter (hat): 8.004 in (203.3 mm)
• Lug / Mounting Hole Quantity: 5
• Bolt Circle Diameter: 4.528 in (115 mm)
• Mounting Bolt Hole Diameter: 0.551 in (14 mm)

The ACDelco 18A81999B is sold individually (1 rotor per pack) and is backed by ACDelco's limited warranty covering defects in material and workmanship. Note: Some ACDelco Gold parts may have formerly appeared under the ACDelco Professional name. California Residents: This product contains chemicals known to the State of California to cause cancer and reproductive harm — see P65Warnings.ca.gov.