Dayco 5080645 Poly Cog Serpentine Belt - 8-Rib 64.57 Inch

The Dayco 5080645 Poly Cog serpentine belt is a heavy-duty 8-rib belt designed for demanding automotive and diesel engine accessory drive applications. Measuring 64.57 inches in effective length and 1.10 inches in width, this belt features Dayco's advanced transverse groove (cog) design that runs up to 50°F cooler than conventional serpentine belts while dramatically reducing rib cracking for extended service life.

Key Features:

• 8-rib configuration with 64.57-inch effective length (1640mm)
• Aramid-reinforced EPDM (Ethylene-Propylene-Diene-Monomer) construction for superior durability
• Transverse groove design provides flexural stress relief and increased flexibility
• Enhanced load-carrying capacity with minimized noise
• Temperature range: -45°F to 212°F (-42.7°C to 100°C)
• Meets or exceeds SAE J1459, SAE J2432, and SAE J1596 specifications
• Specially treated polyester cords ensure length and tension stability

The Poly Cog design delivers at least 40% longer belt life compared to standard serpentine belts through improved heat dissipation and enhanced flexibility for both normal and backside bending applications. This belt is engineered for passenger cars, light-duty trucks, and heavy-duty diesel engines where high torque and power pulses demand superior performance. Replaces numerous OEM part numbers including Gates K080645, Goodyear 4080645, NAPA 25-080645, and many Cummins, John Deere, BMW, and GM applications.